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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.
*
* <p>
* The rolling schedule is specified by the <b>DatePattern</b> option. This
* pattern should follow the {@link SimpleDateFormat} conventions. In
* particular, you <em>must</em> 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.
*
* <p>
* For example, if the <b>File</b> option is set to <code>/foo/bar.log</code>
* and the <b>DatePattern</b> 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.
*
* <p>
* Is is possible to specify monthly, weekly, half-daily, daily, hourly, or
* minutely rollover schedules.
*
* <p>
* <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 <i>/foo/bar.log</i> will be copied to
* <i>/foo/bar.log.2002-23</i>. 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 o'clock 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>
*
* <p>
* Do not use the colon ":" character in anywhere in the <b>DatePattern</b>
* 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() {
}
/**
* Instantiate a <code>DailyRollingFileAppender</code> and open the file
* designated by <code>filename</code>. The opened filename will become
* the ouput destination for this appender.
*
*/
public DailyRollingFileAppender(Layout layout, String filename,
String datePattern) throws IOException {
super(layout, filename, true);
this.datePattern = datePattern;
activateOptions();
}
/**
* The <b>DatePattern</b> takes a string in the same format as expected by
* {@link SimpleDateFormat}. This options determines the rollover schedule.
*/
public void setDatePattern(String pattern) {
datePattern = pattern;
}
/** Returns the value of the <b>DatePattern</b> option. */
public String getDatePattern() {
return datePattern;
}
private String tempFileName=null;//这是我添加一个变量，用来记忆“log4j.appender.LOGFILE.File=./logs/logfile.log”
public void activateOptions() {
if (datePattern != null && fileName != null) {
tempFileName=fileName;//把“./logs/logfile.log”附给tempFileName now.setTime(System.currentTimeMillis());
sdf = new SimpleDateFormat(datePattern);
int type = computeCheckPeriod();
printPeriodicity(type);
rc.setType(type);
File file = new File(fileName);
//--------------我改动的地方------------------------
Date d=new Date();
if(file.exists())
{
d=new Date(file.lastModified());
}
scheduledFilename = fileName
+ sdf.format(d);//格式化文件名
setFile(scheduledFilename);//把格式化好的文件名，设置为日志文件名
now.setTime(System.currentTimeMillis());//设置当前日期
nextCheck = rc.getNextCheckMillis(now);//获取下次更新文件名的日期 //----------------------------------------------------
} else {
LogLog
.error("Either File or DatePattern options are not set for appender ["
+ name + "].");
}
super.activateOptions();//这个必须放到这最后，因为它里面会调用方法“this.setFile(datedFilename, false, this.bufferedIO, this.bufferSize);”
}
void printPeriodicity(int type) {
switch (type) {
case TOP_OF_MINUTE:
LogLog.debug("Appender [" + name + "] to be rolled every minute.");
break;
case TOP_OF_HOUR:
LogLog.debug("Appender [" + name
+ "] to be rolled on top of every hour.");
break;
case HALF_DAY:
LogLog.debug("Appender [" + name
+ "] to be rolled at midday and midnight.");
break;
case TOP_OF_DAY:
LogLog.debug("Appender [" + name + "] to be rolled at midnight.");
break;
case TOP_OF_WEEK:
LogLog.debug("Appender [" + name
+ "] to be rolled at start of week.");
break;
case TOP_OF_MONTH:
LogLog.debug("Appender [" + name
+ "] to be rolled at start of every month.");
break;
default:
LogLog.warn("Unknown periodicity for appender [" + name + "].");
}
}
// This method computes the roll over period by looping over the
// periods, starting with the shortest, and stopping when the r0 is
// different from from r1, where r0 is the epoch formatted according
// the datePattern (supplied by the user) and r1 is the
// epoch+nextMillis(i) formatted according to datePattern. All date
// formatting is done in GMT and not local format because the test
// logic is based on comparisons relative to 1970-01-01 00:00:00
// GMT (the epoch).
int computeCheckPeriod() {
RollingCalendar rollingCalendar = new RollingCalendar(gmtTimeZone,
Locale.ENGLISH);
// set sate to 1970-01-01 00:00:00 GMT
Date epoch = new Date(0);
if (datePattern != null) {
for (int i = TOP_OF_MINUTE; i <= TOP_OF_MONTH; i++) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(
datePattern);
simpleDateFormat.setTimeZone(gmtTimeZone); // do all date
// formatting in GMT
String r0 = simpleDateFormat.format(epoch);
rollingCalendar.setType(i);
Date next = new Date(rollingCalendar.getNextCheckMillis(epoch));
String r1 = simpleDateFormat.format(next);
// System.out.println("Type = "+i+", r0 = "+r0+", r1 = "+r1);
if (r0 != null && r1 != null && !r0.equals(r1)) {
return i;
}
}
}
return TOP_OF_TROUBLE; // Deliberately head for trouble...
}
/**
* Rollover the current file to a new file.
*/
void rollOver() throws IOException {
/* Compute filename, but only if datePattern is specified */
if (datePattern == null) {
errorHandler.error("Missing DatePattern option in rollOver().");
return;
}
String datedFilename =tempFileName+sdf.format(now);//当前的文件名 // It is too early to roll over because we are still within the
// bounds of the current interval. Rollover will occur once the
// next interval is reached.
if (scheduledFilename.equals(datedFilename)) {
return;
}
// close current file, and rename it to datedFilename
this.closeFile();
File target = new File(datedFilename);
if (target.exists()) {
target.delete();
}
//------------------------不需要这段代码-----------
// File file = new File(fileName);
// boolean result = file.renameTo(target);
// if (result) {
// LogLog.debug(fileName + " -> " + scheduledFilename);
// } else {
// LogLog.error("Failed to rename [" + fileName + "] to ["
// + scheduledFilename + "].");
// }
//------------------------------------------------
try {
// This will also close the file. This is OK since multiple
// close operations are safe.
this.setFile(datedFilename, false, this.bufferedIO, this.bufferSize);
} catch (IOException e) {
errorHandler.error("setFile(" + fileName + ", false) call failed.");
}
scheduledFilename = datedFilename;
}
/**
* This method differentiates DailyRollingFileAppender from its super class.
*
* <p>
* Before actually logging, this method will check whether it is time to do
* a rollover. If it is, it will schedule the next rollover time and then
* rollover.
*/
protected void subAppend(LoggingEvent event) {
long n = System.currentTimeMillis();
if (n >= nextCheck) {
now.setTime(n);
nextCheck = rc.getNextCheckMillis(now);
try {
rollOver();
} catch (IOException ioe) {
LogLog.error("rollOver() failed.", ioe);
}
}
super.subAppend(event);
}
}
/**
* RollingCalendar is a helper class to DailyRollingFileAppender. Given a
* periodicity type and the current time, it computes the start of the next
* interval.
*/
class RollingCalendar extends GregorianCalendar {
int type = DailyRollingFileAppender.TOP_OF_TROUBLE;
RollingCalendar() {
super();
}
RollingCalendar(TimeZone tz, Locale locale) {
super(tz, locale);
}
void setType(int type) {
this.type = type;
}
public long getNextCheckMillis(Date now) {
return getNextCheckDate(now).getTime();
}
public Date getNextCheckDate(Date now) {
this.setTime(now);
switch (type) {
case DailyRollingFileAppender.TOP_OF_MINUTE:
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
this.add(Calendar.MINUTE, 1);
break;
case DailyRollingFileAppender.TOP_OF_HOUR:
this.set(Calendar.MINUTE, 0);
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
this.add(Calendar.HOUR_OF_DAY, 1);
break;
case DailyRollingFileAppender.HALF_DAY:
this.set(Calendar.MINUTE, 0);
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
int hour = get(Calendar.HOUR_OF_DAY);
if (hour < 12) {
this.set(Calendar.HOUR_OF_DAY, 12);
} else {
this.set(Calendar.HOUR_OF_DAY, 0);
this.add(Calendar.DAY_OF_MONTH, 1);
}
break;
case DailyRollingFileAppender.TOP_OF_DAY:
this.set(Calendar.HOUR_OF_DAY, 0);
this.set(Calendar.MINUTE, 0);
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
this.add(Calendar.DATE, 1);
break;
case DailyRollingFileAppender.TOP_OF_WEEK:
this.set(Calendar.DAY_OF_WEEK, getFirstDayOfWeek());
this.set(Calendar.HOUR_OF_DAY, 0);
this.set(Calendar.MINUTE, 0);
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
this.add(Calendar.WEEK_OF_YEAR, 1);
break;
case DailyRollingFileAppender.TOP_OF_MONTH:
this.set(Calendar.DATE, 1);
this.set(Calendar.HOUR_OF_DAY, 0);
this.set(Calendar.MINUTE, 0);
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
this.add(Calendar.MONTH, 1);
break;
default:
throw new IllegalStateException("Unknown periodicity type.");
}
return getTime();
}
}
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