[Java][log4j]支持同一时候按日期和文件大小切割日志

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依据DailyRollingFileAppender和RollingFileAppender改编，支持按日期和文件大小切割日志。

源文件：

package com.bao.logging;
import java.io.File;
import java.io.IOException;
import java.io.Writer;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Layout;
import org.apache.log4j.helpers.CountingQuietWriter;
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.helpers.OptionConverter;
import org.apache.log4j.spi.LoggingEvent;
/**
* MyDailyRollingFileAppender 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 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>
*
*
* 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.
*/
public class MyDailyRollingFileAppender extends FileAppender {
// The code assumes that the following constants are in a increasing
// sequence.
;
;
;
;
;
;
;
/**
* The default maximum file size is 10MB.
*/
* 1024 * 1024;
/**
* There is one backup file by default.
*/
;
/**
* 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.
*/
;
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 MyDailyRollingFileAppender() {
}
/**
* Instantiate a <code>MyDailyRollingFileAppender</code> and open the file
* designated by <code>filename</code>. The opened filename will become the
* ouput destination for this appender.
*/
public MyDailyRollingFileAppender(Layout layout, String filename,
String datePattern) throws IOException {
super(layout, filename, true);
this.datePattern = datePattern;
activateOptions();
}
/**
* Get the maximum size that the output file is allowed to reach before
* being rolled over to backup files.
*
* @since 1.1
*/
public long getMaximumFileSize() {
return maxFileSize;
}
/**
* Set the maximum size that the output file is allowed to reach before
* being rolled over to backup files.
*
*
* This method is equivalent to {@link #setMaxFileSize} except that it is
* required for differentiating the setter taking a <code>long</code>
* argument from the setter taking a <code>String</code> argument by the
* JavaBeans {@link java.beans.Introspector Introspector}.
*
* @see #setMaxFileSize(String)
*/
public void setMaximumFileSize(long maxFileSize) {
this.maxFileSize = maxFileSize;
}
/**
* Set the maximum size that the output file is allowed to reach before
* being rolled over to backup files.
*
*
* In configuration files, the MaxFileSize option takes an long
* integer in the range 0 - 2^63. You can specify the value with the
* suffixes "KB", "MB" or "GB" so that the integer is interpreted being
* expressed respectively in kilobytes, megabytes or gigabytes. For example,
* the value "10KB" will be interpreted as 10240.
*/
public void setMaxFileSize(String value) {
);
}
/**
* Returns the value of the MaxBackupIndex option.
*/
public int getMaxBackupIndex() {
return maxBackupIndex;
}
/**
* Set the maximum number of backup files to keep around.
*
*
* The MaxBackupIndex option determines how many backup files are
* kept before the oldest is erased. This option takes a positive integer
* value. If set to zero, then there will be no backup files and the log
* file will be truncated when it reaches <code>MaxFileSize</code>.
*/
public void setMaxBackupIndex(int maxBackups) {
this.maxBackupIndex = maxBackups;
}
/**
* The DatePattern 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 DatePattern option. */
public String getDatePattern() {
return datePattern;
}
public void activateOptions() {
super.activateOptions();
if (datePattern != null && fileName != null) {
now.setTime(System.currentTimeMillis());
sdf = new SimpleDateFormat(datePattern);
int type = computeCheckPeriod();
printPeriodicity(type);
rc.setType(type);
File file = new File(fileName);
scheduledFilename = fileName
+ sdf.format(new Date(file.lastModified()));
} else {
LogLog.error("Either File or DatePattern options are not set for appender ["
+ name + "].");
}
}
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
);
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...
}
/**
* Implements the usual roll over behaviour.
*
*
* If <code>MaxBackupIndex</code> is positive, then files {
* <code>File.1</code>, ..., <code>File.MaxBackupIndex -1</code> are renamed
* to {<code>File.2</code>, ..., <code>File.MaxBackupIndex</code> .
* Moreover, <code>File</code> is renamed <code>File.1</code> and closed. A
* new <code>File</code> is created to receive further log output.
*
*
* If <code>MaxBackupIndex</code> is equal to zero, then the
* <code>File</code> is truncated with no backup files created.
*/
public// synchronization not necessary since doAppend is alreasy synched
void sizeRollOver() {
File target;
File file;
LogLog.debug("rolling over count="
+ ((CountingQuietWriter) qw).getCount());
LogLog.debug("maxBackupIndex=" + maxBackupIndex);
String datedFilename = fileName + sdf.format(now);
) {
// Delete the oldest file, to keep Windows happy.
file = new File(datedFilename + '.' + maxBackupIndex);
if (file.exists())
file.delete();
// Map {(maxBackupIndex - 1), ..., 2, 1} to {maxBackupIndex, ..., 3,
// 2}
; i >= 1; i--) {
file = new File(datedFilename + "." + i);
if (file.exists()) {
));
LogLog.debug("Renaming file " + file + " to " + target);
file.renameTo(target);
}
}
// Rename fileName to datedFilename.1
);
this.closeFile(); // keep windows happy.
file = new File(fileName);
LogLog.debug("Renaming file " + file + " to " + target);
file.renameTo(target);
){//infinite number of files
//find the max backup index
; i < Integer.MAX_VALUE; i++) {
target = new File(datedFilename + "." + i);
if (! target.exists()) {//Rename fileName to datedFilename.i
this.closeFile();
file = new File(fileName);
file.renameTo(target);
LogLog.debug("Renaming file " + file + " to " + target);
break;
}
}
}
try {
// This will also close the file. This is OK since multiple
// close operations are safe.
this.setFile(fileName, false, bufferedIO, bufferSize);
} catch (IOException e) {
LogLog.error("setFile(" + fileName + ", false) call failed.", e);
}
scheduledFilename = datedFilename;
}
public synchronized void setFile(String fileName, boolean append,
boolean bufferedIO, int bufferSize) throws IOException {
super.setFile(fileName, append, this.bufferedIO, this.bufferSize);
if (append) {
File f = new File(fileName);
((CountingQuietWriter) qw).setCount(f.length());
}
}
protected void setQWForFiles(Writer writer) {
this.qw = new CountingQuietWriter(writer, errorHandler);
}
/**
* Rollover the current file to a new file.
*/
void timeRollOver() throws IOException {
/* Compute filename, but only if datePattern is specified */
if (datePattern == null) {
errorHandler.error("Missing DatePattern option in rollOver().");
return;
}
String datedFilename = fileName + sdf.format(now);
// 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(scheduledFilename);
if (target.exists()) {
target.delete();
}
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.
super.setFile(fileName, false, this.bufferedIO, this.bufferSize);
} catch (IOException e) {
errorHandler.error("setFile(" + fileName + ", false) call failed.");
}
scheduledFilename = datedFilename;
}
/**
* This method differentiates MyDailyRollingFileAppender from its super class.
*
*
* 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 {
timeRollOver();
} catch (IOException ioe) {
LogLog.error("rollOver() failed.", ioe);
}
} else if ((fileName != null)
&& ((CountingQuietWriter) qw).getCount() >= maxFileSize) {
sizeRollOver();
}
super.subAppend(event);
}
}
/**
* RollingCalendar is a helper class to MyDailyRollingFileAppender. Given a
* periodicity type and the current time, it computes the start of the next
* interval.
* */
class RollingCalendar extends GregorianCalendar {
int type = MyDailyRollingFileAppender.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 MyDailyRollingFileAppender.TOP_OF_MINUTE:
);
);
);
break;
case MyDailyRollingFileAppender.TOP_OF_HOUR:
);
);
);
);
break;
case MyDailyRollingFileAppender.HALF_DAY:
);
);
);
int hour = get(Calendar.HOUR_OF_DAY);
) {
);
} else {
);
);
}
break;
case MyDailyRollingFileAppender.TOP_OF_DAY:
);
);
);
);
);
break;
case MyDailyRollingFileAppender.TOP_OF_WEEK:
this.set(Calendar.DAY_OF_WEEK, getFirstDayOfWeek());
);
);
);
);
break;
case MyDailyRollingFileAppender.TOP_OF_MONTH:
);
);
);
);
);
break;
default:
throw new IllegalStateException("Unknown periodicity type.");
}
return getTime();
}
}

使用方法：

<appender name="PROJECT" class="com.bao.logging.MyDailyRollingFileAppender">
<param name="file" value="e:/test.log"/>
<param name="DatePattern" value="'.'yyyy-MM-dd'.log'" />
<param name="append" value="true"/>
<param name="MaxFileSize" value="500MB"/>
<param name="MaxBackupIndex" value="20"/>
<param name="encoding" value="UTF-8"/>
<param name="threshold" value="info"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="[%d{dd HH:mm:ss,SSS\} %-5p] [%t] %c{2\} - %m%n"/>
</layout>
</appender>