1821 lines
66 KiB
Java
1821 lines
66 KiB
Java
/*
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* Copyright (C) 2014 The Android Open Source Project
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* Copyright (c) 1995, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.net;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.util.Hashtable;
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import java.util.Date;
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import java.util.StringTokenizer;
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import java.util.Collections;
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import java.util.Map;
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import java.util.List;
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import java.security.Permission;
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import java.security.AccessController;
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import sun.security.util.SecurityConstants;
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import sun.net.www.MessageHeader;
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/**
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* The abstract class {@code URLConnection} is the superclass
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* of all classes that represent a communications link between the
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* application and a URL. Instances of this class can be used both to
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* read from and to write to the resource referenced by the URL. In
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* general, creating a connection to a URL is a multistep process:
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*
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* <center><table border=2 summary="Describes the process of creating a connection to a URL: openConnection() and connect() over time.">
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* <tr><th>{@code openConnection()}</th>
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* <th>{@code connect()}</th></tr>
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* <tr><td>Manipulate parameters that affect the connection to the remote
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* resource.</td>
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* <td>Interact with the resource; query header fields and
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* contents.</td></tr>
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* </table>
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* ---------------------------->
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* <br>time</center>
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*
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* <ol>
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* <li>The connection object is created by invoking the
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* {@code openConnection} method on a URL.
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* <li>The setup parameters and general request properties are manipulated.
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* <li>The actual connection to the remote object is made, using the
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* {@code connect} method.
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* <li>The remote object becomes available. The header fields and the contents
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* of the remote object can be accessed.
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* </ol>
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* <p>
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* The setup parameters are modified using the following methods:
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* <ul>
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* <li>{@code setAllowUserInteraction}
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* <li>{@code setDoInput}
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* <li>{@code setDoOutput}
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* <li>{@code setIfModifiedSince}
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* <li>{@code setUseCaches}
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* </ul>
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* <p>
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* and the general request properties are modified using the method:
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* <ul>
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* <li>{@code setRequestProperty}
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* </ul>
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* <p>
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* Default values for the {@code AllowUserInteraction} and
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* {@code UseCaches} parameters can be set using the methods
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* {@code setDefaultAllowUserInteraction} and
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* {@code setDefaultUseCaches}.
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* <p>
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* Each of the above {@code set} methods has a corresponding
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* {@code get} method to retrieve the value of the parameter or
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* general request property. The specific parameters and general
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* request properties that are applicable are protocol specific.
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* <p>
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* The following methods are used to access the header fields and
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* the contents after the connection is made to the remote object:
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* <ul>
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* <li>{@code getContent}
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* <li>{@code getHeaderField}
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* <li>{@code getInputStream}
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* <li>{@code getOutputStream}
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* </ul>
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* <p>
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* Certain header fields are accessed frequently. The methods:
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* <ul>
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* <li>{@code getContentEncoding}
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* <li>{@code getContentLength}
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* <li>{@code getContentType}
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* <li>{@code getDate}
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* <li>{@code getExpiration}
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* <li>{@code getLastModifed}
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* </ul>
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* <p>
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* provide convenient access to these fields. The
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* {@code getContentType} method is used by the
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* {@code getContent} method to determine the type of the remote
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* object; subclasses may find it convenient to override the
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* {@code getContentType} method.
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* <p>
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* In the common case, all of the pre-connection parameters and
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* general request properties can be ignored: the pre-connection
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* parameters and request properties default to sensible values. For
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* most clients of this interface, there are only two interesting
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* methods: {@code getInputStream} and {@code getContent},
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* which are mirrored in the {@code URL} class by convenience methods.
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* <p>
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* More information on the request properties and header fields of
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* an {@code http} connection can be found at:
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* <blockquote><pre>
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* <a href="http://www.ietf.org/rfc/rfc2616.txt">http://www.ietf.org/rfc/rfc2616.txt</a>
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* </pre></blockquote>
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*
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* Invoking the {@code close()} methods on the {@code InputStream} or {@code OutputStream} of an
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* {@code URLConnection} after a request may free network resources associated with this
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* instance, unless particular protocol specifications specify different behaviours
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* for it.
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*
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* @author James Gosling
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* @see java.net.URL#openConnection()
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* @see java.net.URLConnection#connect()
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* @see java.net.URLConnection#getContent()
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* @see java.net.URLConnection#getContentEncoding()
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* @see java.net.URLConnection#getContentLength()
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* @see java.net.URLConnection#getContentType()
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* @see java.net.URLConnection#getDate()
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* @see java.net.URLConnection#getExpiration()
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* @see java.net.URLConnection#getHeaderField(int)
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* @see java.net.URLConnection#getHeaderField(java.lang.String)
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* @see java.net.URLConnection#getInputStream()
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* @see java.net.URLConnection#getLastModified()
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* @see java.net.URLConnection#getOutputStream()
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* @see java.net.URLConnection#setAllowUserInteraction(boolean)
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* @see java.net.URLConnection#setDefaultUseCaches(boolean)
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* @see java.net.URLConnection#setDoInput(boolean)
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* @see java.net.URLConnection#setDoOutput(boolean)
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* @see java.net.URLConnection#setIfModifiedSince(long)
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* @see java.net.URLConnection#setRequestProperty(java.lang.String, java.lang.String)
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* @see java.net.URLConnection#setUseCaches(boolean)
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* @since JDK1.0
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*/
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public abstract class URLConnection {
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/**
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* The URL represents the remote object on the World Wide Web to
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* which this connection is opened.
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* <p>
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* The value of this field can be accessed by the
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* {@code getURL} method.
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* <p>
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* The default value of this variable is the value of the URL
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* argument in the {@code URLConnection} constructor.
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*
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* @see java.net.URLConnection#getURL()
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* @see java.net.URLConnection#url
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*/
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protected URL url;
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/**
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* This variable is set by the {@code setDoInput} method. Its
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* value is returned by the {@code getDoInput} method.
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* <p>
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* A URL connection can be used for input and/or output. Setting the
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* {@code doInput} flag to {@code true} indicates that
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* the application intends to read data from the URL connection.
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* <p>
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* The default value of this field is {@code true}.
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*
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* @see java.net.URLConnection#getDoInput()
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* @see java.net.URLConnection#setDoInput(boolean)
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*/
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protected boolean doInput = true;
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/**
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* This variable is set by the {@code setDoOutput} method. Its
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* value is returned by the {@code getDoOutput} method.
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* <p>
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* A URL connection can be used for input and/or output. Setting the
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* {@code doOutput} flag to {@code true} indicates
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* that the application intends to write data to the URL connection.
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* <p>
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* The default value of this field is {@code false}.
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*
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* @see java.net.URLConnection#getDoOutput()
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* @see java.net.URLConnection#setDoOutput(boolean)
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*/
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protected boolean doOutput = false;
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private static boolean defaultAllowUserInteraction = false;
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/**
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* If {@code true}, this {@code URL} is being examined in
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* a context in which it makes sense to allow user interactions such
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* as popping up an authentication dialog. If {@code false},
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* then no user interaction is allowed.
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* <p>
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* The value of this field can be set by the
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* {@code setAllowUserInteraction} method.
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* Its value is returned by the
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* {@code getAllowUserInteraction} method.
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* Its default value is the value of the argument in the last invocation
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* of the {@code setDefaultAllowUserInteraction} method.
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*
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* @see java.net.URLConnection#getAllowUserInteraction()
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* @see java.net.URLConnection#setAllowUserInteraction(boolean)
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* @see java.net.URLConnection#setDefaultAllowUserInteraction(boolean)
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*/
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protected boolean allowUserInteraction = defaultAllowUserInteraction;
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private static boolean defaultUseCaches = true;
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/**
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* If {@code true}, the protocol is allowed to use caching
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* whenever it can. If {@code false}, the protocol must always
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* try to get a fresh copy of the object.
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* <p>
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* This field is set by the {@code setUseCaches} method. Its
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* value is returned by the {@code getUseCaches} method.
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* <p>
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* Its default value is the value given in the last invocation of the
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* {@code setDefaultUseCaches} method.
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*
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* @see java.net.URLConnection#setUseCaches(boolean)
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* @see java.net.URLConnection#getUseCaches()
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* @see java.net.URLConnection#setDefaultUseCaches(boolean)
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*/
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protected boolean useCaches = defaultUseCaches;
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/**
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* Some protocols support skipping the fetching of the object unless
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* the object has been modified more recently than a certain time.
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* <p>
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* A nonzero value gives a time as the number of milliseconds since
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* January 1, 1970, GMT. The object is fetched only if it has been
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* modified more recently than that time.
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* <p>
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* This variable is set by the {@code setIfModifiedSince}
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* method. Its value is returned by the
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* {@code getIfModifiedSince} method.
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* <p>
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* The default value of this field is {@code 0}, indicating
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* that the fetching must always occur.
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*
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* @see java.net.URLConnection#getIfModifiedSince()
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* @see java.net.URLConnection#setIfModifiedSince(long)
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*/
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protected long ifModifiedSince = 0;
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/**
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* If {@code false}, this connection object has not created a
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* communications link to the specified URL. If {@code true},
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* the communications link has been established.
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*/
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protected boolean connected = false;
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/**
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* @since 1.5
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*/
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private int connectTimeout;
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private int readTimeout;
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/**
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* @since 1.6
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*/
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private MessageHeader requests;
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/**
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* @since JDK1.1
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*/
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private static FileNameMap fileNameMap;
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// BEGIN Android-changed: Android has its own mime table.
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/*
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/**
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* @since 1.2.2
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*
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private static boolean fileNameMapLoaded = false;
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/**
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* Loads filename map (a mimetable) from a data file. It will
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* first try to load the user-specific table, defined
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* by "content.types.user.table" property. If that fails,
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* it tries to load the default built-in table.
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*
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* @return the FileNameMap
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* @since 1.2
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* @see #setFileNameMap(java.net.FileNameMap)
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*
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public static synchronized FileNameMap getFileNameMap() {
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if ((fileNameMap == null) && !fileNameMapLoaded) {
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fileNameMap = sun.net.www.MimeTable.loadTable();
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fileNameMapLoaded = true;
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}
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return new FileNameMap() {
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private FileNameMap map = fileNameMap;
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public String getContentTypeFor(String fileName) {
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return map.getContentTypeFor(fileName);
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}
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};
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}
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*/
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/**
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* Returns a {@link FileNameMap} implementation suitable for guessing a
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* content type based on a URL's "file" component.
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*
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* @see #guessContentTypeFromName(String)
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* @see #setFileNameMap(java.net.FileNameMap)
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*
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*/
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public static synchronized FileNameMap getFileNameMap() {
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if (fileNameMap == null) {
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fileNameMap = new DefaultFileNameMap();
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}
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return fileNameMap;
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}
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// END Android-changed: Android has its own mime table.
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/**
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* Sets the FileNameMap.
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* <p>
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* If there is a security manager, this method first calls
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* the security manager's {@code checkSetFactory} method
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* to ensure the operation is allowed.
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* This could result in a SecurityException.
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*
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* @param map the FileNameMap to be set
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* @exception SecurityException if a security manager exists and its
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* {@code checkSetFactory} method doesn't allow the operation.
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* @see SecurityManager#checkSetFactory
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* @see #getFileNameMap()
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* @since 1.2
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*/
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public static void setFileNameMap(FileNameMap map) {
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SecurityManager sm = System.getSecurityManager();
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if (sm != null) sm.checkSetFactory();
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fileNameMap = map;
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}
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/**
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* Opens a communications link to the resource referenced by this
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* URL, if such a connection has not already been established.
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* <p>
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* If the {@code connect} method is called when the connection
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* has already been opened (indicated by the {@code connected}
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* field having the value {@code true}), the call is ignored.
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* <p>
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* URLConnection objects go through two phases: first they are
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* created, then they are connected. After being created, and
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* before being connected, various options can be specified
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* (e.g., doInput and UseCaches). After connecting, it is an
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* error to try to set them. Operations that depend on being
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* connected, like getContentLength, will implicitly perform the
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* connection, if necessary.
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*
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* @throws SocketTimeoutException if the timeout expires before
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* the connection can be established
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* @exception IOException if an I/O error occurs while opening the
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* connection.
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* @see java.net.URLConnection#connected
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* @see #getConnectTimeout()
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* @see #setConnectTimeout(int)
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*/
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abstract public void connect() throws IOException;
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// Android-changed: Add javadoc to specify Android's timeout behavior.
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/**
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* Sets a specified timeout value, in milliseconds, to be used
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* when opening a communications link to the resource referenced
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* by this URLConnection. If the timeout expires before the
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* connection can be established, a
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* java.net.SocketTimeoutException is raised. A timeout of zero is
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* interpreted as an infinite timeout.
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* <p> Some non-standard implementation of this method may ignore
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* the specified timeout. To see the connect timeout set, please
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* call getConnectTimeout().
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*
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* <p><strong>Warning</strong>: If the hostname resolves to multiple IP
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* addresses, Android's default implementation of {@link HttpURLConnection}
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* will try each in
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* <a href="http://www.ietf.org/rfc/rfc3484.txt">RFC 3484</a> order. If
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* connecting to each of these addresses fails, multiple timeouts will
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* elapse before the connect attempt throws an exception. Host names
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* that support both IPv6 and IPv4 always have at least 2 IP addresses.
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*
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* @param timeout an {@code int} that specifies the connect
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* timeout value in milliseconds
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* @throws IllegalArgumentException if the timeout parameter is negative
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*
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* @see #getConnectTimeout()
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* @see #connect()
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* @since 1.5
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*/
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public void setConnectTimeout(int timeout) {
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if (timeout < 0) {
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throw new IllegalArgumentException("timeout can not be negative");
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}
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connectTimeout = timeout;
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}
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/**
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* Returns setting for connect timeout.
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* <p>
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* 0 return implies that the option is disabled
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* (i.e., timeout of infinity).
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*
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* @return an {@code int} that indicates the connect timeout
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* value in milliseconds
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* @see #setConnectTimeout(int)
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* @see #connect()
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* @since 1.5
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*/
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public int getConnectTimeout() {
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return connectTimeout;
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}
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/**
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* Sets the read timeout to a specified timeout, in
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* milliseconds. A non-zero value specifies the timeout when
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* reading from Input stream when a connection is established to a
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* resource. If the timeout expires before there is data available
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* for read, a java.net.SocketTimeoutException is raised. A
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* timeout of zero is interpreted as an infinite timeout.
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*
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*<p> Some non-standard implementation of this method ignores the
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* specified timeout. To see the read timeout set, please call
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* getReadTimeout().
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*
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* @param timeout an {@code int} that specifies the timeout
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* value to be used in milliseconds
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* @throws IllegalArgumentException if the timeout parameter is negative
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*
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* @see #getReadTimeout()
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* @see InputStream#read()
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* @since 1.5
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*/
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public void setReadTimeout(int timeout) {
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if (timeout < 0) {
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throw new IllegalArgumentException("timeout can not be negative");
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}
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readTimeout = timeout;
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}
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/**
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* Returns setting for read timeout. 0 return implies that the
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* option is disabled (i.e., timeout of infinity).
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*
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* @return an {@code int} that indicates the read timeout
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* value in milliseconds
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*
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* @see #setReadTimeout(int)
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* @see InputStream#read()
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* @since 1.5
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*/
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public int getReadTimeout() {
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return readTimeout;
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}
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|
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/**
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* Constructs a URL connection to the specified URL. A connection to
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* the object referenced by the URL is not created.
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*
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* @param url the specified URL.
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*/
|
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protected URLConnection(URL url) {
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this.url = url;
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}
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|
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/**
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* Returns the value of this {@code URLConnection}'s {@code URL}
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* field.
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*
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* @return the value of this {@code URLConnection}'s {@code URL}
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* field.
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* @see java.net.URLConnection#url
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*/
|
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public URL getURL() {
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return url;
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}
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|
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/**
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* Returns the value of the {@code content-length} header field.
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|
* <P>
|
|
* <B>Note</B>: {@link #getContentLengthLong() getContentLengthLong()}
|
|
* should be preferred over this method, since it returns a {@code long}
|
|
* instead and is therefore more portable.</P>
|
|
*
|
|
* @return the content length of the resource that this connection's URL
|
|
* references, {@code -1} if the content length is not known,
|
|
* or if the content length is greater than Integer.MAX_VALUE.
|
|
*/
|
|
public int getContentLength() {
|
|
long l = getContentLengthLong();
|
|
if (l > Integer.MAX_VALUE)
|
|
return -1;
|
|
return (int) l;
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the {@code content-length} header field as a
|
|
* long.
|
|
*
|
|
* @return the content length of the resource that this connection's URL
|
|
* references, or {@code -1} if the content length is
|
|
* not known.
|
|
* @since 7.0
|
|
*/
|
|
public long getContentLengthLong() {
|
|
return getHeaderFieldLong("content-length", -1);
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the {@code content-type} header field.
|
|
*
|
|
* @return the content type of the resource that the URL references,
|
|
* or {@code null} if not known.
|
|
* @see java.net.URLConnection#getHeaderField(java.lang.String)
|
|
*/
|
|
public String getContentType() {
|
|
return getHeaderField("content-type");
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the {@code content-encoding} header field.
|
|
*
|
|
* @return the content encoding of the resource that the URL references,
|
|
* or {@code null} if not known.
|
|
* @see java.net.URLConnection#getHeaderField(java.lang.String)
|
|
*/
|
|
public String getContentEncoding() {
|
|
return getHeaderField("content-encoding");
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the {@code expires} header field.
|
|
*
|
|
* @return the expiration date of the resource that this URL references,
|
|
* or 0 if not known. The value is the number of milliseconds since
|
|
* January 1, 1970 GMT.
|
|
* @see java.net.URLConnection#getHeaderField(java.lang.String)
|
|
*/
|
|
public long getExpiration() {
|
|
return getHeaderFieldDate("expires", 0);
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the {@code date} header field.
|
|
*
|
|
* @return the sending date of the resource that the URL references,
|
|
* or {@code 0} if not known. The value returned is the
|
|
* number of milliseconds since January 1, 1970 GMT.
|
|
* @see java.net.URLConnection#getHeaderField(java.lang.String)
|
|
*/
|
|
public long getDate() {
|
|
return getHeaderFieldDate("date", 0);
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the {@code last-modified} header field.
|
|
* The result is the number of milliseconds since January 1, 1970 GMT.
|
|
*
|
|
* @return the date the resource referenced by this
|
|
* {@code URLConnection} was last modified, or 0 if not known.
|
|
* @see java.net.URLConnection#getHeaderField(java.lang.String)
|
|
*/
|
|
public long getLastModified() {
|
|
return getHeaderFieldDate("last-modified", 0);
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the named header field.
|
|
* <p>
|
|
* If called on a connection that sets the same header multiple times
|
|
* with possibly different values, only the last value is returned.
|
|
*
|
|
*
|
|
* @param name the name of a header field.
|
|
* @return the value of the named header field, or {@code null}
|
|
* if there is no such field in the header.
|
|
*/
|
|
public String getHeaderField(String name) {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Returns an unmodifiable Map of the header fields.
|
|
* The Map keys are Strings that represent the
|
|
* response-header field names. Each Map value is an
|
|
* unmodifiable List of Strings that represents
|
|
* the corresponding field values.
|
|
*
|
|
* @return a Map of header fields
|
|
* @since 1.4
|
|
*/
|
|
public Map<String,List<String>> getHeaderFields() {
|
|
return Collections.emptyMap();
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the named field parsed as a number.
|
|
* <p>
|
|
* This form of {@code getHeaderField} exists because some
|
|
* connection types (e.g., {@code http-ng}) have pre-parsed
|
|
* headers. Classes for that connection type can override this method
|
|
* and short-circuit the parsing.
|
|
*
|
|
* @param name the name of the header field.
|
|
* @param Default the default value.
|
|
* @return the value of the named field, parsed as an integer. The
|
|
* {@code Default} value is returned if the field is
|
|
* missing or malformed.
|
|
*/
|
|
public int getHeaderFieldInt(String name, int Default) {
|
|
String value = getHeaderField(name);
|
|
try {
|
|
return Integer.parseInt(value);
|
|
} catch (Exception e) { }
|
|
return Default;
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the named field parsed as a number.
|
|
* <p>
|
|
* This form of {@code getHeaderField} exists because some
|
|
* connection types (e.g., {@code http-ng}) have pre-parsed
|
|
* headers. Classes for that connection type can override this method
|
|
* and short-circuit the parsing.
|
|
*
|
|
* @param name the name of the header field.
|
|
* @param Default the default value.
|
|
* @return the value of the named field, parsed as a long. The
|
|
* {@code Default} value is returned if the field is
|
|
* missing or malformed.
|
|
* @since 7.0
|
|
*/
|
|
public long getHeaderFieldLong(String name, long Default) {
|
|
String value = getHeaderField(name);
|
|
try {
|
|
return Long.parseLong(value);
|
|
} catch (Exception e) { }
|
|
return Default;
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the named field parsed as date.
|
|
* The result is the number of milliseconds since January 1, 1970 GMT
|
|
* represented by the named field.
|
|
* <p>
|
|
* This form of {@code getHeaderField} exists because some
|
|
* connection types (e.g., {@code http-ng}) have pre-parsed
|
|
* headers. Classes for that connection type can override this method
|
|
* and short-circuit the parsing.
|
|
*
|
|
* @param name the name of the header field.
|
|
* @param Default a default value.
|
|
* @return the value of the field, parsed as a date. The value of the
|
|
* {@code Default} argument is returned if the field is
|
|
* missing or malformed.
|
|
*/
|
|
@SuppressWarnings("deprecation")
|
|
public long getHeaderFieldDate(String name, long Default) {
|
|
String value = getHeaderField(name);
|
|
try {
|
|
return Date.parse(value);
|
|
} catch (Exception e) { }
|
|
return Default;
|
|
}
|
|
|
|
/**
|
|
* Returns the key for the {@code n}<sup>th</sup> header field.
|
|
* It returns {@code null} if there are fewer than {@code n+1} fields.
|
|
*
|
|
* @param n an index, where {@code n>=0}
|
|
* @return the key for the {@code n}<sup>th</sup> header field,
|
|
* or {@code null} if there are fewer than {@code n+1}
|
|
* fields.
|
|
*/
|
|
public String getHeaderFieldKey(int n) {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Returns the value for the {@code n}<sup>th</sup> header field.
|
|
* It returns {@code null} if there are fewer than
|
|
* {@code n+1}fields.
|
|
* <p>
|
|
* This method can be used in conjunction with the
|
|
* {@link #getHeaderFieldKey(int) getHeaderFieldKey} method to iterate through all
|
|
* the headers in the message.
|
|
*
|
|
* @param n an index, where {@code n>=0}
|
|
* @return the value of the {@code n}<sup>th</sup> header field
|
|
* or {@code null} if there are fewer than {@code n+1} fields
|
|
* @see java.net.URLConnection#getHeaderFieldKey(int)
|
|
*/
|
|
public String getHeaderField(int n) {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Retrieves the contents of this URL connection.
|
|
* <p>
|
|
* This method first determines the content type of the object by
|
|
* calling the {@code getContentType} method. If this is
|
|
* the first time that the application has seen that specific content
|
|
* type, a content handler for that content type is created:
|
|
* <ol>
|
|
* <li>If the application has set up a content handler factory instance
|
|
* using the {@code setContentHandlerFactory} method, the
|
|
* {@code createContentHandler} method of that instance is called
|
|
* with the content type as an argument; the result is a content
|
|
* handler for that content type.
|
|
* <li>If no content handler factory has yet been set up, or if the
|
|
* factory's {@code createContentHandler} method returns
|
|
* {@code null}, then the application loads the class named:
|
|
* <blockquote><pre>
|
|
* sun.net.www.content.<<i>contentType</i>>
|
|
* </pre></blockquote>
|
|
* where <<i>contentType</i>> is formed by taking the
|
|
* content-type string, replacing all slash characters with a
|
|
* {@code period} ('.'), and all other non-alphanumeric characters
|
|
* with the underscore character '{@code _}'. The alphanumeric
|
|
* characters are specifically the 26 uppercase ASCII letters
|
|
* '{@code A}' through '{@code Z}', the 26 lowercase ASCII
|
|
* letters '{@code a}' through '{@code z}', and the 10 ASCII
|
|
* digits '{@code 0}' through '{@code 9}'. If the specified
|
|
* class does not exist, or is not a subclass of
|
|
* {@code ContentHandler}, then an
|
|
* {@code UnknownServiceException} is thrown.
|
|
* </ol>
|
|
*
|
|
* @return the object fetched. The {@code instanceof} operator
|
|
* should be used to determine the specific kind of object
|
|
* returned.
|
|
* @exception IOException if an I/O error occurs while
|
|
* getting the content.
|
|
* @exception UnknownServiceException if the protocol does not support
|
|
* the content type.
|
|
* @see java.net.ContentHandlerFactory#createContentHandler(java.lang.String)
|
|
* @see java.net.URLConnection#getContentType()
|
|
* @see java.net.URLConnection#setContentHandlerFactory(java.net.ContentHandlerFactory)
|
|
*/
|
|
public Object getContent() throws IOException {
|
|
// Must call getInputStream before GetHeaderField gets called
|
|
// so that FileNotFoundException has a chance to be thrown up
|
|
// from here without being caught.
|
|
getInputStream();
|
|
return getContentHandler().getContent(this);
|
|
}
|
|
|
|
/**
|
|
* Retrieves the contents of this URL connection.
|
|
*
|
|
* @param classes the {@code Class} array
|
|
* indicating the requested types
|
|
* @return the object fetched that is the first match of the type
|
|
* specified in the classes array. null if none of
|
|
* the requested types are supported.
|
|
* The {@code instanceof} operator should be used to
|
|
* determine the specific kind of object returned.
|
|
* @exception IOException if an I/O error occurs while
|
|
* getting the content.
|
|
* @exception UnknownServiceException if the protocol does not support
|
|
* the content type.
|
|
* @see java.net.URLConnection#getContent()
|
|
* @see java.net.ContentHandlerFactory#createContentHandler(java.lang.String)
|
|
* @see java.net.URLConnection#getContent(java.lang.Class[])
|
|
* @see java.net.URLConnection#setContentHandlerFactory(java.net.ContentHandlerFactory)
|
|
* @since 1.3
|
|
*/
|
|
public Object getContent(Class[] classes) throws IOException {
|
|
// Must call getInputStream before GetHeaderField gets called
|
|
// so that FileNotFoundException has a chance to be thrown up
|
|
// from here without being caught.
|
|
getInputStream();
|
|
return getContentHandler().getContent(this, classes);
|
|
}
|
|
|
|
/**
|
|
* Returns a permission object representing the permission
|
|
* necessary to make the connection represented by this
|
|
* object. This method returns null if no permission is
|
|
* required to make the connection. By default, this method
|
|
* returns {@code java.security.AllPermission}. Subclasses
|
|
* should override this method and return the permission
|
|
* that best represents the permission required to make a
|
|
* a connection to the URL. For example, a {@code URLConnection}
|
|
* representing a {@code file:} URL would return a
|
|
* {@code java.io.FilePermission} object.
|
|
*
|
|
* <p>The permission returned may dependent upon the state of the
|
|
* connection. For example, the permission before connecting may be
|
|
* different from that after connecting. For example, an HTTP
|
|
* sever, say foo.com, may redirect the connection to a different
|
|
* host, say bar.com. Before connecting the permission returned by
|
|
* the connection will represent the permission needed to connect
|
|
* to foo.com, while the permission returned after connecting will
|
|
* be to bar.com.
|
|
*
|
|
* <p>Permissions are generally used for two purposes: to protect
|
|
* caches of objects obtained through URLConnections, and to check
|
|
* the right of a recipient to learn about a particular URL. In
|
|
* the first case, the permission should be obtained
|
|
* <em>after</em> the object has been obtained. For example, in an
|
|
* HTTP connection, this will represent the permission to connect
|
|
* to the host from which the data was ultimately fetched. In the
|
|
* second case, the permission should be obtained and tested
|
|
* <em>before</em> connecting.
|
|
*
|
|
* @return the permission object representing the permission
|
|
* necessary to make the connection represented by this
|
|
* URLConnection.
|
|
*
|
|
* @exception IOException if the computation of the permission
|
|
* requires network or file I/O and an exception occurs while
|
|
* computing it.
|
|
*/
|
|
public Permission getPermission() throws IOException {
|
|
return SecurityConstants.ALL_PERMISSION;
|
|
}
|
|
|
|
/**
|
|
* Returns an input stream that reads from this open connection.
|
|
*
|
|
* A SocketTimeoutException can be thrown when reading from the
|
|
* returned input stream if the read timeout expires before data
|
|
* is available for read.
|
|
*
|
|
* @return an input stream that reads from this open connection.
|
|
* @exception IOException if an I/O error occurs while
|
|
* creating the input stream.
|
|
* @exception UnknownServiceException if the protocol does not support
|
|
* input.
|
|
* @see #setReadTimeout(int)
|
|
* @see #getReadTimeout()
|
|
*/
|
|
public InputStream getInputStream() throws IOException {
|
|
throw new UnknownServiceException("protocol doesn't support input");
|
|
}
|
|
|
|
/**
|
|
* Returns an output stream that writes to this connection.
|
|
*
|
|
* @return an output stream that writes to this connection.
|
|
* @exception IOException if an I/O error occurs while
|
|
* creating the output stream.
|
|
* @exception UnknownServiceException if the protocol does not support
|
|
* output.
|
|
*/
|
|
public OutputStream getOutputStream() throws IOException {
|
|
throw new UnknownServiceException("protocol doesn't support output");
|
|
}
|
|
|
|
/**
|
|
* Returns a {@code String} representation of this URL connection.
|
|
*
|
|
* @return a string representation of this {@code URLConnection}.
|
|
*/
|
|
public String toString() {
|
|
return this.getClass().getName() + ":" + url;
|
|
}
|
|
|
|
/**
|
|
* Sets the value of the {@code doInput} field for this
|
|
* {@code URLConnection} to the specified value.
|
|
* <p>
|
|
* A URL connection can be used for input and/or output. Set the DoInput
|
|
* flag to true if you intend to use the URL connection for input,
|
|
* false if not. The default is true.
|
|
*
|
|
* @param doinput the new value.
|
|
* @throws IllegalStateException if already connected
|
|
* @see java.net.URLConnection#doInput
|
|
* @see #getDoInput()
|
|
*/
|
|
public void setDoInput(boolean doinput) {
|
|
if (connected)
|
|
throw new IllegalStateException("Already connected");
|
|
doInput = doinput;
|
|
}
|
|
|
|
/**
|
|
* Returns the value of this {@code URLConnection}'s
|
|
* {@code doInput} flag.
|
|
*
|
|
* @return the value of this {@code URLConnection}'s
|
|
* {@code doInput} flag.
|
|
* @see #setDoInput(boolean)
|
|
*/
|
|
public boolean getDoInput() {
|
|
return doInput;
|
|
}
|
|
|
|
/**
|
|
* Sets the value of the {@code doOutput} field for this
|
|
* {@code URLConnection} to the specified value.
|
|
* <p>
|
|
* A URL connection can be used for input and/or output. Set the DoOutput
|
|
* flag to true if you intend to use the URL connection for output,
|
|
* false if not. The default is false.
|
|
*
|
|
* @param dooutput the new value.
|
|
* @throws IllegalStateException if already connected
|
|
* @see #getDoOutput()
|
|
*/
|
|
public void setDoOutput(boolean dooutput) {
|
|
if (connected)
|
|
throw new IllegalStateException("Already connected");
|
|
doOutput = dooutput;
|
|
}
|
|
|
|
/**
|
|
* Returns the value of this {@code URLConnection}'s
|
|
* {@code doOutput} flag.
|
|
*
|
|
* @return the value of this {@code URLConnection}'s
|
|
* {@code doOutput} flag.
|
|
* @see #setDoOutput(boolean)
|
|
*/
|
|
public boolean getDoOutput() {
|
|
return doOutput;
|
|
}
|
|
|
|
/**
|
|
* Set the value of the {@code allowUserInteraction} field of
|
|
* this {@code URLConnection}.
|
|
*
|
|
* @param allowuserinteraction the new value.
|
|
* @throws IllegalStateException if already connected
|
|
* @see #getAllowUserInteraction()
|
|
*/
|
|
public void setAllowUserInteraction(boolean allowuserinteraction) {
|
|
if (connected)
|
|
throw new IllegalStateException("Already connected");
|
|
allowUserInteraction = allowuserinteraction;
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the {@code allowUserInteraction} field for
|
|
* this object.
|
|
*
|
|
* @return the value of the {@code allowUserInteraction} field for
|
|
* this object.
|
|
* @see #setAllowUserInteraction(boolean)
|
|
*/
|
|
public boolean getAllowUserInteraction() {
|
|
return allowUserInteraction;
|
|
}
|
|
|
|
/**
|
|
* Sets the default value of the
|
|
* {@code allowUserInteraction} field for all future
|
|
* {@code URLConnection} objects to the specified value.
|
|
*
|
|
* @param defaultallowuserinteraction the new value.
|
|
* @see #getDefaultAllowUserInteraction()
|
|
*/
|
|
public static void setDefaultAllowUserInteraction(boolean defaultallowuserinteraction) {
|
|
defaultAllowUserInteraction = defaultallowuserinteraction;
|
|
}
|
|
|
|
/**
|
|
* Returns the default value of the {@code allowUserInteraction}
|
|
* field.
|
|
* <p>
|
|
* Ths default is "sticky", being a part of the static state of all
|
|
* URLConnections. This flag applies to the next, and all following
|
|
* URLConnections that are created.
|
|
*
|
|
* @return the default value of the {@code allowUserInteraction}
|
|
* field.
|
|
* @see #setDefaultAllowUserInteraction(boolean)
|
|
*/
|
|
public static boolean getDefaultAllowUserInteraction() {
|
|
return defaultAllowUserInteraction;
|
|
}
|
|
|
|
/**
|
|
* Sets the value of the {@code useCaches} field of this
|
|
* {@code URLConnection} to the specified value.
|
|
* <p>
|
|
* Some protocols do caching of documents. Occasionally, it is important
|
|
* to be able to "tunnel through" and ignore the caches (e.g., the
|
|
* "reload" button in a browser). If the UseCaches flag on a connection
|
|
* is true, the connection is allowed to use whatever caches it can.
|
|
* If false, caches are to be ignored.
|
|
* The default value comes from DefaultUseCaches, which defaults to
|
|
* true.
|
|
*
|
|
* @param usecaches a {@code boolean} indicating whether
|
|
* or not to allow caching
|
|
* @throws IllegalStateException if already connected
|
|
* @see #getUseCaches()
|
|
*/
|
|
public void setUseCaches(boolean usecaches) {
|
|
if (connected)
|
|
throw new IllegalStateException("Already connected");
|
|
useCaches = usecaches;
|
|
}
|
|
|
|
/**
|
|
* Returns the value of this {@code URLConnection}'s
|
|
* {@code useCaches} field.
|
|
*
|
|
* @return the value of this {@code URLConnection}'s
|
|
* {@code useCaches} field.
|
|
* @see #setUseCaches(boolean)
|
|
*/
|
|
public boolean getUseCaches() {
|
|
return useCaches;
|
|
}
|
|
|
|
/**
|
|
* Sets the value of the {@code ifModifiedSince} field of
|
|
* this {@code URLConnection} to the specified value.
|
|
*
|
|
* @param ifmodifiedsince the new value.
|
|
* @throws IllegalStateException if already connected
|
|
* @see #getIfModifiedSince()
|
|
*/
|
|
public void setIfModifiedSince(long ifmodifiedsince) {
|
|
if (connected)
|
|
throw new IllegalStateException("Already connected");
|
|
ifModifiedSince = ifmodifiedsince;
|
|
}
|
|
|
|
/**
|
|
* Returns the value of this object's {@code ifModifiedSince} field.
|
|
*
|
|
* @return the value of this object's {@code ifModifiedSince} field.
|
|
* @see #setIfModifiedSince(long)
|
|
*/
|
|
public long getIfModifiedSince() {
|
|
return ifModifiedSince;
|
|
}
|
|
|
|
/**
|
|
* Returns the default value of a {@code URLConnection}'s
|
|
* {@code useCaches} flag.
|
|
* <p>
|
|
* Ths default is "sticky", being a part of the static state of all
|
|
* URLConnections. This flag applies to the next, and all following
|
|
* URLConnections that are created.
|
|
*
|
|
* @return the default value of a {@code URLConnection}'s
|
|
* {@code useCaches} flag.
|
|
* @see #setDefaultUseCaches(boolean)
|
|
*/
|
|
public boolean getDefaultUseCaches() {
|
|
return defaultUseCaches;
|
|
}
|
|
|
|
/**
|
|
* Sets the default value of the {@code useCaches} field to the
|
|
* specified value.
|
|
*
|
|
* @param defaultusecaches the new value.
|
|
* @see #getDefaultUseCaches()
|
|
*/
|
|
public void setDefaultUseCaches(boolean defaultusecaches) {
|
|
defaultUseCaches = defaultusecaches;
|
|
}
|
|
|
|
/**
|
|
* Sets the general request property. If a property with the key already
|
|
* exists, overwrite its value with the new value.
|
|
*
|
|
* <p> NOTE: HTTP requires all request properties which can
|
|
* legally have multiple instances with the same key
|
|
* to use a comma-separated list syntax which enables multiple
|
|
* properties to be appended into a single property.
|
|
*
|
|
* @param key the keyword by which the request is known
|
|
* (e.g., "{@code Accept}").
|
|
* @param value the value associated with it.
|
|
* @throws IllegalStateException if already connected
|
|
* @throws NullPointerException if key is <CODE>null</CODE>
|
|
* @see #getRequestProperty(java.lang.String)
|
|
*/
|
|
public void setRequestProperty(String key, String value) {
|
|
if (connected)
|
|
throw new IllegalStateException("Already connected");
|
|
if (key == null)
|
|
throw new NullPointerException ("key is null");
|
|
|
|
if (requests == null)
|
|
requests = new MessageHeader();
|
|
|
|
requests.set(key, value);
|
|
}
|
|
|
|
/**
|
|
* Adds a general request property specified by a
|
|
* key-value pair. This method will not overwrite
|
|
* existing values associated with the same key.
|
|
*
|
|
* @param key the keyword by which the request is known
|
|
* (e.g., "{@code Accept}").
|
|
* @param value the value associated with it.
|
|
* @throws IllegalStateException if already connected
|
|
* @throws NullPointerException if key is null
|
|
* @see #getRequestProperties()
|
|
* @since 1.4
|
|
*/
|
|
public void addRequestProperty(String key, String value) {
|
|
if (connected)
|
|
throw new IllegalStateException("Already connected");
|
|
if (key == null)
|
|
throw new NullPointerException ("key is null");
|
|
|
|
if (requests == null)
|
|
requests = new MessageHeader();
|
|
|
|
requests.add(key, value);
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns the value of the named general request property for this
|
|
* connection.
|
|
*
|
|
* @param key the keyword by which the request is known (e.g., "Accept").
|
|
* @return the value of the named general request property for this
|
|
* connection. If key is null, then null is returned.
|
|
* @throws IllegalStateException if already connected
|
|
* @see #setRequestProperty(java.lang.String, java.lang.String)
|
|
*/
|
|
public String getRequestProperty(String key) {
|
|
if (connected)
|
|
throw new IllegalStateException("Already connected");
|
|
|
|
if (requests == null)
|
|
return null;
|
|
|
|
return requests.findValue(key);
|
|
}
|
|
|
|
/**
|
|
* Returns an unmodifiable Map of general request
|
|
* properties for this connection. The Map keys
|
|
* are Strings that represent the request-header
|
|
* field names. Each Map value is a unmodifiable List
|
|
* of Strings that represents the corresponding
|
|
* field values.
|
|
*
|
|
* @return a Map of the general request properties for this connection.
|
|
* @throws IllegalStateException if already connected
|
|
* @since 1.4
|
|
*/
|
|
public Map<String,List<String>> getRequestProperties() {
|
|
if (connected)
|
|
throw new IllegalStateException("Already connected");
|
|
|
|
if (requests == null)
|
|
return Collections.emptyMap();
|
|
|
|
return requests.getHeaders(null);
|
|
}
|
|
|
|
/**
|
|
* Sets the default value of a general request property. When a
|
|
* {@code URLConnection} is created, it is initialized with
|
|
* these properties.
|
|
*
|
|
* @param key the keyword by which the request is known
|
|
* (e.g., "{@code Accept}").
|
|
* @param value the value associated with the key.
|
|
*
|
|
* @see java.net.URLConnection#setRequestProperty(java.lang.String,java.lang.String)
|
|
*
|
|
* @deprecated The instance specific setRequestProperty method
|
|
* should be used after an appropriate instance of URLConnection
|
|
* is obtained. Invoking this method will have no effect.
|
|
*
|
|
* @see #getDefaultRequestProperty(java.lang.String)
|
|
*/
|
|
@Deprecated
|
|
public static void setDefaultRequestProperty(String key, String value) {
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the default request property. Default request
|
|
* properties are set for every connection.
|
|
*
|
|
* @param key the keyword by which the request is known (e.g., "Accept").
|
|
* @return the value of the default request property
|
|
* for the specified key.
|
|
*
|
|
* @see java.net.URLConnection#getRequestProperty(java.lang.String)
|
|
*
|
|
* @deprecated The instance specific getRequestProperty method
|
|
* should be used after an appropriate instance of URLConnection
|
|
* is obtained.
|
|
*
|
|
* @see #setDefaultRequestProperty(java.lang.String, java.lang.String)
|
|
*/
|
|
@Deprecated
|
|
public static String getDefaultRequestProperty(String key) {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* The ContentHandler factory.
|
|
*/
|
|
static ContentHandlerFactory factory;
|
|
|
|
/**
|
|
* Sets the {@code ContentHandlerFactory} of an
|
|
* application. It can be called at most once by an application.
|
|
* <p>
|
|
* The {@code ContentHandlerFactory} instance is used to
|
|
* construct a content handler from a content type
|
|
* <p>
|
|
* If there is a security manager, this method first calls
|
|
* the security manager's {@code checkSetFactory} method
|
|
* to ensure the operation is allowed.
|
|
* This could result in a SecurityException.
|
|
*
|
|
* @param fac the desired factory.
|
|
* @exception Error if the factory has already been defined.
|
|
* @exception SecurityException if a security manager exists and its
|
|
* {@code checkSetFactory} method doesn't allow the operation.
|
|
* @see java.net.ContentHandlerFactory
|
|
* @see java.net.URLConnection#getContent()
|
|
* @see SecurityManager#checkSetFactory
|
|
*/
|
|
public static synchronized void setContentHandlerFactory(ContentHandlerFactory fac) {
|
|
if (factory != null) {
|
|
throw new Error("factory already defined");
|
|
}
|
|
SecurityManager security = System.getSecurityManager();
|
|
if (security != null) {
|
|
security.checkSetFactory();
|
|
}
|
|
factory = fac;
|
|
}
|
|
|
|
private static Hashtable<String, ContentHandler> handlers = new Hashtable<>();
|
|
|
|
/**
|
|
* Gets the Content Handler appropriate for this connection.
|
|
*/
|
|
synchronized ContentHandler getContentHandler()
|
|
throws IOException
|
|
{
|
|
String contentType = stripOffParameters(getContentType());
|
|
ContentHandler handler = null;
|
|
// BEGIN Android-changed: App Compat. Android guesses content type from name and stream.
|
|
if (contentType == null) {
|
|
if ((contentType = guessContentTypeFromName(url.getFile())) == null) {
|
|
contentType = guessContentTypeFromStream(getInputStream());
|
|
}
|
|
}
|
|
|
|
if (contentType == null) {
|
|
return UnknownContentHandler.INSTANCE;
|
|
}
|
|
// END Android-changed: App Compat. Android guesses content type from name and stream.
|
|
try {
|
|
handler = handlers.get(contentType);
|
|
if (handler != null)
|
|
return handler;
|
|
} catch(Exception e) {
|
|
}
|
|
|
|
if (factory != null)
|
|
handler = factory.createContentHandler(contentType);
|
|
if (handler == null) {
|
|
try {
|
|
handler = lookupContentHandlerClassFor(contentType);
|
|
} catch(Exception e) {
|
|
e.printStackTrace();
|
|
handler = UnknownContentHandler.INSTANCE;
|
|
}
|
|
handlers.put(contentType, handler);
|
|
}
|
|
return handler;
|
|
}
|
|
|
|
/*
|
|
* Media types are in the format: type/subtype*(; parameter).
|
|
* For looking up the content handler, we should ignore those
|
|
* parameters.
|
|
*/
|
|
private String stripOffParameters(String contentType)
|
|
{
|
|
if (contentType == null)
|
|
return null;
|
|
int index = contentType.indexOf(';');
|
|
|
|
if (index > 0)
|
|
return contentType.substring(0, index);
|
|
else
|
|
return contentType;
|
|
}
|
|
|
|
private static final String contentClassPrefix = "sun.net.www.content";
|
|
private static final String contentPathProp = "java.content.handler.pkgs";
|
|
|
|
/**
|
|
* Looks for a content handler in a user-defineable set of places.
|
|
* By default it looks in sun.net.www.content, but users can define a
|
|
* vertical-bar delimited set of class prefixes to search through in
|
|
* addition by defining the java.content.handler.pkgs property.
|
|
* The class name must be of the form:
|
|
* <pre>
|
|
* {package-prefix}.{major}.{minor}
|
|
* e.g.
|
|
* YoyoDyne.experimental.text.plain
|
|
* </pre>
|
|
*/
|
|
private ContentHandler lookupContentHandlerClassFor(String contentType)
|
|
throws InstantiationException, IllegalAccessException, ClassNotFoundException {
|
|
String contentHandlerClassName = typeToPackageName(contentType);
|
|
|
|
String contentHandlerPkgPrefixes =getContentHandlerPkgPrefixes();
|
|
|
|
StringTokenizer packagePrefixIter =
|
|
new StringTokenizer(contentHandlerPkgPrefixes, "|");
|
|
|
|
while (packagePrefixIter.hasMoreTokens()) {
|
|
String packagePrefix = packagePrefixIter.nextToken().trim();
|
|
|
|
try {
|
|
String clsName = packagePrefix + "." + contentHandlerClassName;
|
|
Class<?> cls = null;
|
|
try {
|
|
cls = Class.forName(clsName);
|
|
} catch (ClassNotFoundException e) {
|
|
ClassLoader cl = ClassLoader.getSystemClassLoader();
|
|
if (cl != null) {
|
|
cls = cl.loadClass(clsName);
|
|
}
|
|
}
|
|
if (cls != null) {
|
|
ContentHandler handler =
|
|
(ContentHandler)cls.newInstance();
|
|
return handler;
|
|
}
|
|
} catch(Exception e) {
|
|
}
|
|
}
|
|
|
|
return UnknownContentHandler.INSTANCE;
|
|
}
|
|
|
|
/**
|
|
* Utility function to map a MIME content type into an equivalent
|
|
* pair of class name components. For example: "text/html" would
|
|
* be returned as "text.html"
|
|
*/
|
|
private String typeToPackageName(String contentType) {
|
|
// make sure we canonicalize the class name: all lower case
|
|
contentType = contentType.toLowerCase();
|
|
int len = contentType.length();
|
|
char nm[] = new char[len];
|
|
contentType.getChars(0, len, nm, 0);
|
|
for (int i = 0; i < len; i++) {
|
|
char c = nm[i];
|
|
if (c == '/') {
|
|
nm[i] = '.';
|
|
} else if (!('A' <= c && c <= 'Z' ||
|
|
'a' <= c && c <= 'z' ||
|
|
'0' <= c && c <= '9')) {
|
|
nm[i] = '_';
|
|
}
|
|
}
|
|
return new String(nm);
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns a vertical bar separated list of package prefixes for potential
|
|
* content handlers. Tries to get the java.content.handler.pkgs property
|
|
* to use as a set of package prefixes to search. Whether or not
|
|
* that property has been defined, the sun.net.www.content is always
|
|
* the last one on the returned package list.
|
|
*/
|
|
private String getContentHandlerPkgPrefixes() {
|
|
String packagePrefixList = AccessController.doPrivileged(
|
|
new sun.security.action.GetPropertyAction(contentPathProp, ""));
|
|
|
|
if (packagePrefixList != "") {
|
|
packagePrefixList += "|";
|
|
}
|
|
|
|
return packagePrefixList + contentClassPrefix;
|
|
}
|
|
|
|
/**
|
|
* Tries to determine the content type of an object, based
|
|
* on the specified "file" component of a URL.
|
|
* This is a convenience method that can be used by
|
|
* subclasses that override the {@code getContentType} method.
|
|
*
|
|
* @param fname a filename.
|
|
* @return a guess as to what the content type of the object is,
|
|
* based upon its file name.
|
|
* @see java.net.URLConnection#getContentType()
|
|
*/
|
|
public static String guessContentTypeFromName(String fname) {
|
|
return getFileNameMap().getContentTypeFor(fname);
|
|
}
|
|
|
|
/**
|
|
* Tries to determine the type of an input stream based on the
|
|
* characters at the beginning of the input stream. This method can
|
|
* be used by subclasses that override the
|
|
* {@code getContentType} method.
|
|
* <p>
|
|
* Ideally, this routine would not be needed. But many
|
|
* {@code http} servers return the incorrect content type; in
|
|
* addition, there are many nonstandard extensions. Direct inspection
|
|
* of the bytes to determine the content type is often more accurate
|
|
* than believing the content type claimed by the {@code http} server.
|
|
*
|
|
* @param is an input stream that supports marks.
|
|
* @return a guess at the content type, or {@code null} if none
|
|
* can be determined.
|
|
* @exception IOException if an I/O error occurs while reading the
|
|
* input stream.
|
|
* @see java.io.InputStream#mark(int)
|
|
* @see java.io.InputStream#markSupported()
|
|
* @see java.net.URLConnection#getContentType()
|
|
*/
|
|
static public String guessContentTypeFromStream(InputStream is)
|
|
throws IOException {
|
|
// If we can't read ahead safely, just give up on guessing
|
|
if (!is.markSupported())
|
|
return null;
|
|
|
|
is.mark(16);
|
|
int c1 = is.read();
|
|
int c2 = is.read();
|
|
int c3 = is.read();
|
|
int c4 = is.read();
|
|
int c5 = is.read();
|
|
int c6 = is.read();
|
|
int c7 = is.read();
|
|
int c8 = is.read();
|
|
int c9 = is.read();
|
|
int c10 = is.read();
|
|
int c11 = is.read();
|
|
int c12 = is.read();
|
|
int c13 = is.read();
|
|
int c14 = is.read();
|
|
int c15 = is.read();
|
|
int c16 = is.read();
|
|
is.reset();
|
|
|
|
if (c1 == 0xCA && c2 == 0xFE && c3 == 0xBA && c4 == 0xBE) {
|
|
return "application/java-vm";
|
|
}
|
|
|
|
if (c1 == 0xAC && c2 == 0xED) {
|
|
// next two bytes are version number, currently 0x00 0x05
|
|
return "application/x-java-serialized-object";
|
|
}
|
|
|
|
if (c1 == '<') {
|
|
if (c2 == '!'
|
|
|| ((c2 == 'h' && (c3 == 't' && c4 == 'm' && c5 == 'l' ||
|
|
c3 == 'e' && c4 == 'a' && c5 == 'd') ||
|
|
(c2 == 'b' && c3 == 'o' && c4 == 'd' && c5 == 'y'))) ||
|
|
((c2 == 'H' && (c3 == 'T' && c4 == 'M' && c5 == 'L' ||
|
|
c3 == 'E' && c4 == 'A' && c5 == 'D') ||
|
|
(c2 == 'B' && c3 == 'O' && c4 == 'D' && c5 == 'Y')))) {
|
|
return "text/html";
|
|
}
|
|
|
|
if (c2 == '?' && c3 == 'x' && c4 == 'm' && c5 == 'l' && c6 == ' ') {
|
|
return "application/xml";
|
|
}
|
|
}
|
|
|
|
// big and little (identical) endian UTF-8 encodings, with BOM
|
|
if (c1 == 0xef && c2 == 0xbb && c3 == 0xbf) {
|
|
if (c4 == '<' && c5 == '?' && c6 == 'x') {
|
|
return "application/xml";
|
|
}
|
|
}
|
|
|
|
// big and little endian UTF-16 encodings, with byte order mark
|
|
if (c1 == 0xfe && c2 == 0xff) {
|
|
if (c3 == 0 && c4 == '<' && c5 == 0 && c6 == '?' &&
|
|
c7 == 0 && c8 == 'x') {
|
|
return "application/xml";
|
|
}
|
|
}
|
|
|
|
if (c1 == 0xff && c2 == 0xfe) {
|
|
if (c3 == '<' && c4 == 0 && c5 == '?' && c6 == 0 &&
|
|
c7 == 'x' && c8 == 0) {
|
|
return "application/xml";
|
|
}
|
|
}
|
|
|
|
// big and little endian UTF-32 encodings, with BOM
|
|
if (c1 == 0x00 && c2 == 0x00 && c3 == 0xfe && c4 == 0xff) {
|
|
if (c5 == 0 && c6 == 0 && c7 == 0 && c8 == '<' &&
|
|
c9 == 0 && c10 == 0 && c11 == 0 && c12 == '?' &&
|
|
c13 == 0 && c14 == 0 && c15 == 0 && c16 == 'x') {
|
|
return "application/xml";
|
|
}
|
|
}
|
|
|
|
if (c1 == 0xff && c2 == 0xfe && c3 == 0x00 && c4 == 0x00) {
|
|
if (c5 == '<' && c6 == 0 && c7 == 0 && c8 == 0 &&
|
|
c9 == '?' && c10 == 0 && c11 == 0 && c12 == 0 &&
|
|
c13 == 'x' && c14 == 0 && c15 == 0 && c16 == 0) {
|
|
return "application/xml";
|
|
}
|
|
}
|
|
|
|
if (c1 == 'G' && c2 == 'I' && c3 == 'F' && c4 == '8') {
|
|
return "image/gif";
|
|
}
|
|
|
|
if (c1 == '#' && c2 == 'd' && c3 == 'e' && c4 == 'f') {
|
|
return "image/x-bitmap";
|
|
}
|
|
|
|
if (c1 == '!' && c2 == ' ' && c3 == 'X' && c4 == 'P' &&
|
|
c5 == 'M' && c6 == '2') {
|
|
return "image/x-pixmap";
|
|
}
|
|
|
|
if (c1 == 137 && c2 == 80 && c3 == 78 &&
|
|
c4 == 71 && c5 == 13 && c6 == 10 &&
|
|
c7 == 26 && c8 == 10) {
|
|
return "image/png";
|
|
}
|
|
|
|
if (c1 == 0xFF && c2 == 0xD8 && c3 == 0xFF) {
|
|
if (c4 == 0xE0 || c4 == 0xEE) {
|
|
return "image/jpeg";
|
|
}
|
|
|
|
/**
|
|
* File format used by digital cameras to store images.
|
|
* Exif Format can be read by any application supporting
|
|
* JPEG. Exif Spec can be found at:
|
|
* http://www.pima.net/standards/it10/PIMA15740/Exif_2-1.PDF
|
|
*/
|
|
if ((c4 == 0xE1) &&
|
|
(c7 == 'E' && c8 == 'x' && c9 == 'i' && c10 =='f' &&
|
|
c11 == 0)) {
|
|
return "image/jpeg";
|
|
}
|
|
}
|
|
|
|
if (c1 == 0xD0 && c2 == 0xCF && c3 == 0x11 && c4 == 0xE0 &&
|
|
c5 == 0xA1 && c6 == 0xB1 && c7 == 0x1A && c8 == 0xE1) {
|
|
|
|
/* Above is signature of Microsoft Structured Storage.
|
|
* Below this, could have tests for various SS entities.
|
|
* For now, just test for FlashPix.
|
|
*/
|
|
if (checkfpx(is)) {
|
|
return "image/vnd.fpx";
|
|
}
|
|
}
|
|
|
|
if (c1 == 0x2E && c2 == 0x73 && c3 == 0x6E && c4 == 0x64) {
|
|
return "audio/basic"; // .au format, big endian
|
|
}
|
|
|
|
if (c1 == 0x64 && c2 == 0x6E && c3 == 0x73 && c4 == 0x2E) {
|
|
return "audio/basic"; // .au format, little endian
|
|
}
|
|
|
|
if (c1 == 'R' && c2 == 'I' && c3 == 'F' && c4 == 'F') {
|
|
/* I don't know if this is official but evidence
|
|
* suggests that .wav files start with "RIFF" - brown
|
|
*/
|
|
return "audio/x-wav";
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Check for FlashPix image data in InputStream is. Return true if
|
|
* the stream has FlashPix data, false otherwise. Before calling this
|
|
* method, the stream should have already been checked to be sure it
|
|
* contains Microsoft Structured Storage data.
|
|
*/
|
|
static private boolean checkfpx(InputStream is) throws IOException {
|
|
|
|
/* Test for FlashPix image data in Microsoft Structured Storage format.
|
|
* In general, should do this with calls to an SS implementation.
|
|
* Lacking that, need to dig via offsets to get to the FlashPix
|
|
* ClassID. Details:
|
|
*
|
|
* Offset to Fpx ClsID from beginning of stream should be:
|
|
*
|
|
* FpxClsidOffset = rootEntryOffset + clsidOffset
|
|
*
|
|
* where: clsidOffset = 0x50.
|
|
* rootEntryOffset = headerSize + sectorSize*sectDirStart
|
|
* + 128*rootEntryDirectory
|
|
*
|
|
* where: headerSize = 0x200 (always)
|
|
* sectorSize = 2 raised to power of uSectorShift,
|
|
* which is found in the header at
|
|
* offset 0x1E.
|
|
* sectDirStart = found in the header at offset 0x30.
|
|
* rootEntryDirectory = in general, should search for
|
|
* directory labelled as root.
|
|
* We will assume value of 0 (i.e.,
|
|
* rootEntry is in first directory)
|
|
*/
|
|
|
|
// Mark the stream so we can reset it. 0x100 is enough for the first
|
|
// few reads, but the mark will have to be reset and set again once
|
|
// the offset to the root directory entry is computed. That offset
|
|
// can be very large and isn't know until the stream has been read from
|
|
is.mark(0x100);
|
|
|
|
// Get the byte ordering located at 0x1E. 0xFE is Intel,
|
|
// 0xFF is other
|
|
long toSkip = (long)0x1C;
|
|
long posn;
|
|
|
|
if ((posn = skipForward(is, toSkip)) < toSkip) {
|
|
is.reset();
|
|
return false;
|
|
}
|
|
|
|
int c[] = new int[16];
|
|
if (readBytes(c, 2, is) < 0) {
|
|
is.reset();
|
|
return false;
|
|
}
|
|
|
|
int byteOrder = c[0];
|
|
|
|
posn+=2;
|
|
int uSectorShift;
|
|
if (readBytes(c, 2, is) < 0) {
|
|
is.reset();
|
|
return false;
|
|
}
|
|
|
|
if(byteOrder == 0xFE) {
|
|
uSectorShift = c[0];
|
|
uSectorShift += c[1] << 8;
|
|
}
|
|
else {
|
|
uSectorShift = c[0] << 8;
|
|
uSectorShift += c[1];
|
|
}
|
|
|
|
posn += 2;
|
|
toSkip = (long)0x30 - posn;
|
|
long skipped = 0;
|
|
if ((skipped = skipForward(is, toSkip)) < toSkip) {
|
|
is.reset();
|
|
return false;
|
|
}
|
|
posn += skipped;
|
|
|
|
if (readBytes(c, 4, is) < 0) {
|
|
is.reset();
|
|
return false;
|
|
}
|
|
|
|
int sectDirStart;
|
|
if(byteOrder == 0xFE) {
|
|
sectDirStart = c[0];
|
|
sectDirStart += c[1] << 8;
|
|
sectDirStart += c[2] << 16;
|
|
sectDirStart += c[3] << 24;
|
|
} else {
|
|
sectDirStart = c[0] << 24;
|
|
sectDirStart += c[1] << 16;
|
|
sectDirStart += c[2] << 8;
|
|
sectDirStart += c[3];
|
|
}
|
|
posn += 4;
|
|
is.reset(); // Reset back to the beginning
|
|
|
|
toSkip = 0x200L + (long)(1<<uSectorShift)*sectDirStart + 0x50L;
|
|
|
|
// Sanity check!
|
|
if (toSkip < 0) {
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* How far can we skip? Is there any performance problem here?
|
|
* This skip can be fairly long, at least 0x4c650 in at least
|
|
* one case. Have to assume that the skip will fit in an int.
|
|
* Leave room to read whole root dir
|
|
*/
|
|
is.mark((int)toSkip+0x30);
|
|
|
|
if ((skipForward(is, toSkip)) < toSkip) {
|
|
is.reset();
|
|
return false;
|
|
}
|
|
|
|
/* should be at beginning of ClassID, which is as follows
|
|
* (in Intel byte order):
|
|
* 00 67 61 56 54 C1 CE 11 85 53 00 AA 00 A1 F9 5B
|
|
*
|
|
* This is stored from Windows as long,short,short,char[8]
|
|
* so for byte order changes, the order only changes for
|
|
* the first 8 bytes in the ClassID.
|
|
*
|
|
* Test against this, ignoring second byte (Intel) since
|
|
* this could change depending on part of Fpx file we have.
|
|
*/
|
|
|
|
if (readBytes(c, 16, is) < 0) {
|
|
is.reset();
|
|
return false;
|
|
}
|
|
|
|
// intel byte order
|
|
if (byteOrder == 0xFE &&
|
|
c[0] == 0x00 && c[2] == 0x61 && c[3] == 0x56 &&
|
|
c[4] == 0x54 && c[5] == 0xC1 && c[6] == 0xCE &&
|
|
c[7] == 0x11 && c[8] == 0x85 && c[9] == 0x53 &&
|
|
c[10]== 0x00 && c[11]== 0xAA && c[12]== 0x00 &&
|
|
c[13]== 0xA1 && c[14]== 0xF9 && c[15]== 0x5B) {
|
|
is.reset();
|
|
return true;
|
|
}
|
|
|
|
// non-intel byte order
|
|
else if (c[3] == 0x00 && c[1] == 0x61 && c[0] == 0x56 &&
|
|
c[5] == 0x54 && c[4] == 0xC1 && c[7] == 0xCE &&
|
|
c[6] == 0x11 && c[8] == 0x85 && c[9] == 0x53 &&
|
|
c[10]== 0x00 && c[11]== 0xAA && c[12]== 0x00 &&
|
|
c[13]== 0xA1 && c[14]== 0xF9 && c[15]== 0x5B) {
|
|
is.reset();
|
|
return true;
|
|
}
|
|
is.reset();
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Tries to read the specified number of bytes from the stream
|
|
* Returns -1, If EOF is reached before len bytes are read, returns 0
|
|
* otherwise
|
|
*/
|
|
static private int readBytes(int c[], int len, InputStream is)
|
|
throws IOException {
|
|
|
|
byte buf[] = new byte[len];
|
|
if (is.read(buf, 0, len) < len) {
|
|
return -1;
|
|
}
|
|
|
|
// fill the passed in int array
|
|
for (int i = 0; i < len; i++) {
|
|
c[i] = buf[i] & 0xff;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Skips through the specified number of bytes from the stream
|
|
* until either EOF is reached, or the specified
|
|
* number of bytes have been skipped
|
|
*/
|
|
static private long skipForward(InputStream is, long toSkip)
|
|
throws IOException {
|
|
|
|
long eachSkip = 0;
|
|
long skipped = 0;
|
|
|
|
while (skipped != toSkip) {
|
|
eachSkip = is.skip(toSkip - skipped);
|
|
|
|
// check if EOF is reached
|
|
if (eachSkip <= 0) {
|
|
if (is.read() == -1) {
|
|
return skipped ;
|
|
} else {
|
|
skipped++;
|
|
}
|
|
}
|
|
skipped += eachSkip;
|
|
}
|
|
return skipped;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
class UnknownContentHandler extends ContentHandler {
|
|
static final ContentHandler INSTANCE = new UnknownContentHandler();
|
|
|
|
public Object getContent(URLConnection uc) throws IOException {
|
|
return uc.getInputStream();
|
|
}
|
|
}
|