log4j⽀持同时按⽇期和⽂件⼤⼩分割⽇志重写源代码，可以将代码作为⼯具类使⽤：
1.Log4JDateAndSizeSplit.java
/**
* Project Name:hao24-common
* File Name:Log4JDateAndSizeSplit.java
* Package Name:cn.hao24.util.spring
* Date:2016年3⽉31⽇上午11:30:22
* Copyright (c) 2016, lujie All Rights Reserved.
*
*/
package test
/
**
* ClassName:Log4JDateAndSizeSplit :log4j⽇志⽀持按照⽇期和⼤⼩进⾏切割<br/>
* Date:    2016年3⽉31⽇上午11:30:22 <br/>
* @author  lujie
* @version
* @see
*/
import java.io.File;
import java.io.IOException;
import java.io.Writer;
SimpleDateFormat;
import java.util.Date;
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;
/**
*
* ClassName: Log4JDateAndSizeSplit <br/>
* Function: Log4j⽣成⽇志类重写，该类可以按照⽇期+指定⼤⼩分隔⽇志. <br/>
* date: 2016年3⽉31⽇下午12:44:14 <br/>
* @author lujie
* @version
*/
public class Log4JDateAndSizeSplit 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 default maximum file size is 10MB.
*/
protected long maxFileSize = 10 * 1024 * 1024;
/**
* There is one backup file by default.
*/
protected int maxBackupIndex = 1;
/**
* meaning daily rollover.
*/
private String datePattern = "'.'yyyy-MM-dd";
/**
* "scheduledFilename" at the beginning of the next hour.
*
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("GMT");
/**
* The default constructor does nothing.
*/
public Log4JDateAndSizeSplit()
{
}
/**
* ouput destination for this appender.
*/
public Log4JDateAndSizeSplit(Layout layout, String filename, String datePattern) throws IOException  {
super(layout, filename, true);
this.datePattern = datePattern;
activateOptions();
}
/**
* being rolled over to backup files.
*
* @since 1.1
*/
public long getMaximumFileSize()
{
log4j2不打印日志return maxFileSize;
}
/
**
* being rolled over to backup files.
*
* <p>
* JavaBeans {@link java.beans.Introspector Introspector}.
*
* @see #setMaxFileSize(String)
*/
public void setMaximumFileSize(long maxFileSize)
{
this.maxFileSize = maxFileSize;
}
/**
* being rolled over to backup files.
*
* <p>
* the value "10KB" will be interpreted as 10240.
*/
public void setMaxFileSize(String value)
{
maxFileSize = FileSize(value, maxFileSize + 1);
}
/
**
* Returns the value of the <b>MaxBackupIndex</b> option.
*/
public int getMaxBackupIndex()
{
return maxBackupIndex;
}
/**
* Set the maximum number of backup files to keep around.
*
* <p>
*/
public void setMaxBackupIndex(int maxBackups)
this.maxBackupIndex = maxBackups;
}
/**
*/
public void setDatePattern(String pattern)
{
datePattern = pattern;
}
/** Returns the value of the <b>DatePattern</b> option. */
public String getDatePattern()
{
return datePattern;
}
@Override
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
{
<("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
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 NextCheckMillis(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
}
/**
* Implements the usual roll over behaviour.
*
* <p>
* If <code>MaxBackupIndex</code> is positive, then files {
*
* <p>
* 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);
if (maxBackupIndex > 0)
{
// Delete the oldest file, to keep Windows happy.
file = new File(datedFilename + '.' + maxBackupIndex);
if (ists())
file.delete();
// Map {(maxBackupIndex - 1), ..., 2, 1} to {maxBackupIndex, ..., 3,
// 2}
for (int i = maxBackupIndex - 1; i >= 1; i--)
{
file = new File(datedFilename + "." + i);
if (ists())
{
target = new File(datedFilename + '.' + (i + 1));
LogLog.debug("Renaming file " + file + " to " + target);
}
}
// Rename fileName to datedFilename.1
target = new File(datedFilename + "." + 1);
this.closeFile(); // keep windows happy.
file = new File(fileName);
LogLog.debug("Renaming file " + file + " to " + target);
}
else if (maxBackupIndex < 0)
{ // infinite number of files
// find the max backup index
for (int i = 1; i < Integer.MAX_VALUE; i++)
{
target = new File(datedFilename + "." + i);
if (!ists())
{ // Rename fileName to datedFilename.i
this.closeFile();
file = new File(fileName);
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)
{
<("setFile(" + fileName + ", false) call failed.", e);
}
scheduledFilename = datedFilename;
}
@Override
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());
}
}
@Override
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)
{
<("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 (ists())
{
target.delete();
}
File file = new File(fileName);
boolean result = ameTo(target);
if (result)
{
LogLog.debug(fileName + " -> " + scheduledFilename);
}
else
{
<("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)
{
<("setFile(" + fileName + ", false) call failed.");
}
scheduledFilename = datedFilename;
}

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