DailyRollingFileAppender的改进，统一日志文件名(1)

作者：xiaoyuer 来源：不详整理日期：2007-4-10

我的log4j.properties的配置如下：
log4j.rootCategory=INFO,CONSOLE,LOGFILE

log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE=org.apache.log4j.DailyRollingFileAppender
log4j.appender.LOGFILE.File=./logs/logfile.log
log4j.appender.LOGFILE.DatePattern=_yyyyMMdd.log
log4j.appender.LOGFILE.Threshold=INFO
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%-4r [%t] %-5p %d{yyyy-MM-dd HH\:mm\:ssS} %x %l- %m%n

这样在第一次调用Log4j时生成的文件是“logfile.log”，而我想为了统一日志文件名，应该统一为DatePattern格式，我看了看DailyRollingFileAppender的源文件，发现做一些小小的改到就可以实现我想的功能了.

/*
* Copyright 1999-2005 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package org.apache.log4j;

import java.io.IOException;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Calendar;
import java.util.TimeZone;
import java.util.Locale;

import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.spi.LoggingEvent;

/**
* DailyRollingFileAppender extends {@link FileAppender} so that the underlying
* file is rolled over at a user chosen frequency.
*
* 
* The rolling schedule is specified by the DatePattern option. This
* pattern should follow the {@link SimpleDateFormat} conventions. In
* particular, you must escape literal text within a pair of single
* quotes. A formatted version of the date pattern is used as the suffix for the
* rolled file name.
*
* 
* For example, if the File option is set to <code>/foo/bar.log</code>
* and the DatePattern set to <code>.yyyy-MM-dd</code>, on
* 2001-02-16 at midnight, the logging file <code>/foo/bar.log</code> will be
* copied to <code>/foo/bar.log.2001-02-16</code> and logging for 2001-02-17
* will continue in <code>/foo/bar.log</code> until it rolls over the next
* day.
*
* 
* Is is possible to specify monthly, weekly, half-daily, daily, hourly, or
* minutely rollover schedules.
*
* 
* <table border="1" cellpadding="2">
* <tr>
* <th>DatePattern</th>
* <th>Rollover schedule</th>
* <th>Example</th>
*
* <tr>
* <td><code>.yyyy-MM</code>
* <td>Rollover at the beginning of each month</td>
*
* <td>At midnight of May 31st, 2002 <code>/foo/bar.log</code> will be copied
* to <code>/foo/bar.log.2002-05</code>. Logging for the month of June will
* be output to <code>/foo/bar.log</code> until it is also rolled over the
* next month.
*
* <tr>
* <td><code>.yyyy-ww</code>
*
* <td>Rollover at the first day of each week. The first day of the week
* depends on the locale.</td>
*
* <td>Assuming the first day of the week is Sunday, on Saturday midnight, June
* 9th 2002, the file /foo/bar.log will be copied to
* /foo/bar.log.2002-23. Logging for the 24th week of 2002 will be
* output to <code>/foo/bar.log</code> until it is rolled over the next week.
*
* <tr>
* <td><code>.yyyy-MM-dd</code>
*
* <td>Rollover at midnight each day.</td>
*
* <td>At midnight, on March 8th, 2002, <code>/foo/bar.log</code> will be
* copied to <code>/foo/bar.log.2002-03-08</code>. Logging for the 9th day of
* March will be output to <code>/foo/bar.log</code> until it is rolled over
* the next day.
*
* <tr>
* <td><code>.yyyy-MM-dd-a</code>
*
* <td>Rollover at midnight and midday of each day.</td>
*
* <td>At noon, on March 9th, 2002, <code>/foo/bar.log</code> will be copied
* to <code>/foo/bar.log.2002-03-09-AM</code>. Logging for the afternoon of
* the 9th will be output to <code>/foo/bar.log</code> until it is rolled over
* at midnight.
*
* <tr>
* <td><code>.yyyy-MM-dd-HH</code>
*
* <td>Rollover at the top of every hour.</td>
*
* <td>At approximately 11:00.000 oclock on March 9th, 2002,
* <code>/foo/bar.log</code> will be copied to
* <code>/foo/bar.log.2002-03-09-10</code>. Logging for the 11th hour of the
* 9th of March will be output to <code>/foo/bar.log</code> until it is rolled
* over at the beginning of the next hour.
*
*
* <tr>
* <td><code>.yyyy-MM-dd-HH-mm</code>
*
* <td>Rollover at the beginning of every minute.</td>
*
* <td>At approximately 11:23,000, on March 9th, 2001,
* <code>/foo/bar.log</code> will be copied to
* <code>/foo/bar.log.2001-03-09-10-22</code>. Logging for the minute of
* 11:23 (9th of March) will be output to <code>/foo/bar.log</code> until it
* is rolled over the next minute.
*
* </table>
*
* 
* Do not use the colon ":" character in anywhere in the DatePattern
* option. The text before the colon is interpeted as the protocol specificaion
* of a URL which is probably not what you want.
*
*
* @author Eirik Lygre
* @author Ceki Gülcü
*/
public class DailyRollingFileAppender extends FileAppender {

 // The code assumes that the following constants are in a increasing
 // sequence.
 static final int TOP_OF_TROUBLE = -1;

 static final int TOP_OF_MINUTE = 0;

 static final int TOP_OF_HOUR = 1;

 static final int HALF_DAY = 2;

 static final int TOP_OF_DAY = 3;

 static final int TOP_OF_WEEK = 4;

 static final int TOP_OF_MONTH = 5;

 /**
 * The date pattern. By default, the pattern is set to ".yyyy-MM-dd"
 * meaning daily rollover.
 */
 private String datePattern = ".yyyy-MM-dd";

 /**
 * The log file will be renamed to the value of the scheduledFilename
 * variable when the next interval is entered. For example, if the rollover
 * period is one hour, the log file will be renamed to the value of
 * "scheduledFilename" at the beginning of the next hour.
 *
 * The precise time when a rollover occurs depends on logging activity.
 */
 private String scheduledFilename;

 /**
 * The next time we estimate a rollover should occur.
 */
 private long nextCheck = System.currentTimeMillis() - 1;

 Date now = new Date();

 SimpleDateFormat sdf;

 RollingCalendar rc = new RollingCalendar();

 int checkPeriod = TOP_OF_TROUBLE;

 // The gmtTimeZone is used only in computeCheckPeriod() method.
 static final TimeZone gmtTimeZone = TimeZone.getTimeZone("GMT");

 /**
 * The default constructor does nothing.
 */
 public DailyRollingFileAppender() {
 }

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