170 lines
7.2 KiB
Java
170 lines
7.2 KiB
Java
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/*
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* Copyright (c) 2000, 2012, 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.util.logging;
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import java.io.*;
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import java.text.*;
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import java.util.Date;
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import sun.util.logging.LoggingSupport;
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/**
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* Print a brief summary of the {@code LogRecord} in a human readable
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* format. The summary will typically be 1 or 2 lines.
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*
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* <p>
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* <a name="formatting">
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* <b>Configuration:</b></a>
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* The {@code SimpleFormatter} is initialized with the
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* <a href="../Formatter.html#syntax">format string</a>
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* specified in the {@code java.util.logging.SimpleFormatter.format}
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* property to {@linkplain #format format} the log messages.
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* This property can be defined
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* in the {@linkplain LogManager#getProperty logging properties}
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* configuration file
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* or as a system property. If this property is set in both
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* the logging properties and system properties,
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* the format string specified in the system property will be used.
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* If this property is not defined or the given format string
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* is {@linkplain java.util.IllegalFormatException illegal},
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* the default format is implementation-specific.
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*
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* @since 1.4
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* @see java.util.Formatter
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*/
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public class SimpleFormatter extends Formatter {
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// format string for printing the log record
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private static final String format = LoggingSupport.getSimpleFormat();
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private final Date dat = new Date();
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/**
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* Format the given LogRecord.
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* <p>
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* The formatting can be customized by specifying the
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* <a href="../Formatter.html#syntax">format string</a>
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* in the <a href="#formatting">
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* {@code java.util.logging.SimpleFormatter.format}</a> property.
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* The given {@code LogRecord} will be formatted as if by calling:
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* <pre>
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* {@link String#format String.format}(format, date, source, logger, level, message, thrown);
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* </pre>
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* where the arguments are:<br>
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* <ol>
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* <li>{@code format} - the {@link java.util.Formatter
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* java.util.Formatter} format string specified in the
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* {@code java.util.logging.SimpleFormatter.format} property
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* or the default format.</li>
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* <li>{@code date} - a {@link Date} object representing
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* {@linkplain LogRecord#getMillis event time} of the log record.</li>
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* <li>{@code source} - a string representing the caller, if available;
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* otherwise, the logger's name.</li>
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* <li>{@code logger} - the logger's name.</li>
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* <li>{@code level} - the {@linkplain Level#getLocalizedName
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* log level}.</li>
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* <li>{@code message} - the formatted log message
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* returned from the {@link Formatter#formatMessage(LogRecord)}
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* method. It uses {@link java.text.MessageFormat java.text}
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* formatting and does not use the {@code java.util.Formatter
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* format} argument.</li>
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* <li>{@code thrown} - a string representing
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* the {@linkplain LogRecord#getThrown throwable}
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* associated with the log record and its backtrace
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* beginning with a newline character, if any;
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* otherwise, an empty string.</li>
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* </ol>
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*
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* <p>Some example formats:<br>
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* <ul>
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* <li> {@code java.util.logging.SimpleFormatter.format="%4$s: %5$s [%1$tc]%n"}
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* <p>This prints 1 line with the log level ({@code 4$}),
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* the log message ({@code 5$}) and the timestamp ({@code 1$}) in
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* a square bracket.
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* <pre>
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* WARNING: warning message [Tue Mar 22 13:11:31 PDT 2011]
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* </pre></li>
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* <li> {@code java.util.logging.SimpleFormatter.format="%1$tc %2$s%n%4$s: %5$s%6$s%n"}
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* <p>This prints 2 lines where the first line includes
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* the timestamp ({@code 1$}) and the source ({@code 2$});
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* the second line includes the log level ({@code 4$}) and
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* the log message ({@code 5$}) followed with the throwable
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* and its backtrace ({@code 6$}), if any:
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* <pre>
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* Tue Mar 22 13:11:31 PDT 2011 MyClass fatal
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* SEVERE: several message with an exception
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* java.lang.IllegalArgumentException: invalid argument
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* at MyClass.mash(MyClass.java:9)
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* at MyClass.crunch(MyClass.java:6)
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* at MyClass.main(MyClass.java:3)
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* </pre></li>
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* <li> {@code java.util.logging.SimpleFormatter.format="%1$tb %1$td, %1$tY %1$tl:%1$tM:%1$tS %1$Tp %2$s%n%4$s: %5$s%n"}
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* <p>This prints 2 lines similar to the example above
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* with a different date/time formatting and does not print
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* the throwable and its backtrace:
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* <pre>
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* Mar 22, 2011 1:11:31 PM MyClass fatal
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* SEVERE: several message with an exception
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* </pre></li>
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* </ul>
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* <p>This method can also be overridden in a subclass.
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* It is recommended to use the {@link Formatter#formatMessage}
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* convenience method to localize and format the message field.
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*
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* @param record the log record to be formatted.
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* @return a formatted log record
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*/
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public synchronized String format(LogRecord record) {
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dat.setTime(record.getMillis());
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String source;
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if (record.getSourceClassName() != null) {
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source = record.getSourceClassName();
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if (record.getSourceMethodName() != null) {
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source += " " + record.getSourceMethodName();
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}
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} else {
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source = record.getLoggerName();
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}
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String message = formatMessage(record);
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String throwable = "";
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if (record.getThrown() != null) {
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StringWriter sw = new StringWriter();
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PrintWriter pw = new PrintWriter(sw);
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pw.println();
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record.getThrown().printStackTrace(pw);
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pw.close();
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throwable = sw.toString();
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}
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return String.format(format,
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dat,
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source,
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record.getLoggerName(),
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record.getLevel().getLocalizedLevelName(),
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message,
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throwable);
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}
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}
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