log4j 同时按日期和文件大小分割日志

待我称王封你为后i 2022-07-12 10:25 232阅读 0赞

重写源代码，可以将代码作为工具类使用（扩展FileAppender类）

package com.ihangmei.datareceive.commons;
 
 
 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;
 
 
 public class MyDailyRollingFileAppender 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 MyDailyRollingFileAppender()
 {
 }
 
 /** 
 * ouput destination for this appender. 
 */
 public MyDailyRollingFileAppender(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. 
 * 
 * 
 * JavaBeans {@link java.beans.Introspector Introspector}. 
 * 
 * @see #setMaxFileSize(String) 
 */
 public void setMaximumFileSize(long maxFileSize)
 {
 this.maxFileSize = maxFileSize;
 }
 
 /** 
 * being rolled over to backup files. 
 * 
 * 
 * the value "10KB" will be interpreted as 10240. 
 */
 public void setMaxFileSize(String value)
 {
 maxFileSize = OptionConverter.toFileSize(value, maxFileSize + 1);
 }
 
 /** 
 * Returns the value of the MaxBackupIndex option. 
 */
 public int getMaxBackupIndex()
 {
 return maxBackupIndex;
 }
 
 /** 
 * Set the maximum number of backup files to keep around. 
 * 
 * 
 */
 public void setMaxBackupIndex(int maxBackups)
 {
 this.maxBackupIndex = maxBackups;
 }
 
 /** 
 */
 public void setDatePattern(String pattern)
 {
 datePattern = pattern;
 }
 
 /** Returns the value of the DatePattern 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. 
 * 
 * 
 * If <code>MaxBackupIndex</code> is positive, then files { 
 
 * 
 * 
 * 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;
 }
 
 /** 
 * 
 * 
 * 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);
 
 }
 }

package com.ihangmei.datareceive.commons;
 
 import java.util.Calendar;
 import java.util.Date;
 import java.util.GregorianCalendar;
 import java.util.Locale;
 import java.util.TimeZone;
 
 /**
 * ClassName:RollingCalendar 
 * Date: 2016年3月31日 上午11:41:34 
 * @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();
 }
 }

log4j.properties配置：

log4j.rootLogger=INFO,R
    
    log4j.appender.R=com.ihangmei.datareceive.commons.MyDailyRollingFileAppender
    log4j.appender.R.Threshold=INFO
    log4j.appender.R.ImmediateFlush=true
    log4j.appender.R.File=C:\\logs\\debug-logs\\test
    log4j.appender.R.DatePattern='_'yyyy-MM-dd-HH-mm'.log'
    log4j.appender.R.Append=true
    log4j.appender.R.MaxFileSize=50KB
    #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=%m%n

本文转载自：博客园文章： [log4j 同时按日期和文件大小分割日志][log4j]

还有另一篇文章参考：http://blog.csdn.net/szwangdf/article/details/37563307

[log4j]: http://www.cnblogs.com/jasonlu1016/p/5345546.html