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;
import java.text.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.getTimeZone("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()
	{
		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 = OptionConverter.toFileSize(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
		{
			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
		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...
	}

	/**  
	* 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 (file.exists())
				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 (file.exists())
				{
					target = new File(datedFilename + '.' + (i + 1));
					LogLog.debug("Renaming file " + file + " to " + target);
					file.renameTo(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);
			file.renameTo(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 (!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;
	}

	@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)
		{
			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;
	}

	/**  
	*   
	* <p>  
	* rollover.  
	* */
	@Override
	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

/**
 * Project Name:hao24-common
 * File Name:RollingCalendar.java
 * Package Name:cn.hao24.util.spring
 * Date:2016年3月31日上午11:41:34
 * Copyright (c) 2016, lujie@hao24.cn All Rights Reserved.
 *
*/


import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;

/**
 * ClassName:RollingCalendar <br/>
 * Date:     2016年3月31日 上午11:41:34 <br/>
 * @author   lujie
 * @version  
 * @see 	 
 */
class RollingCalendar extends GregorianCalendar
{
	private static final long serialVersionUID = -3560331770601814177L;

	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:
			this.set(Calendar.SECOND, 0);
			this.set(Calendar.MILLISECOND, 0);
			this.add(Calendar.MINUTE, 1);
			break;
		case MyDailyRollingFileAppender.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 MyDailyRollingFileAppender.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 MyDailyRollingFileAppender.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 MyDailyRollingFileAppender.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 MyDailyRollingFileAppender.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();
	}
}

　　之后在配置文件中配置相关信息：

log4j.appender.R=test.Log4JDateAndSizeSplit
log4j.appender.R.Threshold=INFO
log4j.appender.R.ImmediateFlush=true
log4j.appender.R.File=/xxx.log
log4j.appender.R.DatePattern='_'yyyy-MM-dd'.log'
log4j.appender.R.Append=true
log4j.appender.R.MaxFileSize=200MB
#MaxBackupIndex=-1(not limit about file number)
log4j.appender.R.MaxBackupIndex=-1
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern= %d{yyyy -MM-dd HH\:mm \:ss} [%5p] - %c -%F(%L) -%m%n

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log4j 支持同时按日期和文件大小分割日志

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