自定义log4j日志文件命名规则是什么

小编给大家分享一下自定义log4j日志文件命名规则是什么，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

自定义log4j日志文件命名规则

项目中的日志需要采用一致的命名规范和文件规范，命名规则为：项目模块标识_index_日期时间_日志级别.log，且每个级别日志文件放在单独的文件夹，且每个文件夹下日志的数量不得超过10个，当数量超过限制时，删除相对较旧的日志，保留较新的日志。

但是发现log4j并不能满足此要求，于是

根据log4j的API定义自己的FileAppender

代码如下：

package com.dear.simpler.dbrpc.util.log; import java.io.File;import java.io.IOException;import java.io.InterruptedIOException;import java.text.SimpleDateFormat;import java.util.Arrays;import java.util.Comparator;import java.util.Date;import java.util.concurrent.atomic.AtomicInteger;import java.util.regex.Matcher;import java.util.regex.Pattern; import org.apache.log4j.RollingFileAppender;import org.apache.log4j.helpers.CountingQuietWriter;import org.apache.log4j.helpers.LogLog;import org.apache.log4j.spi.LoggingEvent;/**; *  * @author lixiang * 自定义log文件的命名规则 */public class MyLogFileAppender extends RollingFileAppender {          private long nextRollover = 0;      private static AtomicInteger logIndex = new AtomicInteger(0);    //index      public void rollOver() {          File file = null;            if (qw != null) {              long size = ((CountingQuietWriter) qw).getCount();              LogLog.debug("rolling over count=" + size);              // if operation fails, do not roll again until              // maxFileSize more bytes are written              nextRollover = size + maxFileSize;          }          LogLog.debug("maxBackupIndex=" + maxBackupIndex);            if (maxBackupIndex > 0) {              file = new File(getRollingFileName(fileName, logIndex.incrementAndGet()));            if (fileExisted(file)){                      file = new File(getRollingFileName(fileName, logIndex.incrementAndGet()));              }            deleteOldFile(file.getParentFile(), maxBackupIndex);            this.closeFile();        }         try {              this.setFile(getRollingFileName(fileName, logIndex.get()), false, bufferedIO, bufferSize);              nextRollover = 0;          } catch (IOException e) {              if (e instanceof InterruptedIOException) {              Thread.currentThread().interrupt();          }            LogLog.error("setFile(" + fileName + ", false) call failed.", e);          }    }        private String getRollingFileName(String fileName, int index) {     //使用正则表达式替代index        Pattern p = Pattern.compile("_\\d+\\_");              Matcher m=p.matcher(fileName);        String str = m.replaceFirst(String.format("_%d_", index));        SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");   //日期          String dateString = format.format(new Date(System.currentTimeMillis()));        str = str.replaceAll("\\d{14}", dateString);        return str;      }    public synchronized void setFile(String fileName, boolean append,   //修改文件名            boolean bufferedIO, int bufferSize) throws IOException {             SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");   //日期          String dateString = format.format(new Date(System.currentTimeMillis()));          String temp = String.format(fileName , dateString);   //文件名        super.setFile(temp, append, bufferedIO, bufferSize);                  if(append) {            File f = new File(temp);            ((CountingQuietWriter)this.qw).setCount(f.length());        }    }        private boolean fileExisted(File file){            boolean res = false;            String[] fts = file.getName().split("_");            File parentFile = file.getParentFile();            for(File f : parentFile.listFiles()){                    String[] fns = f.getName().split("_");                    if(fns[0].equals(fts[0]) && fns[1].equals(fts[1])){                            res = true;                            break;                    }            }            return res;    }      private void deleteOldFile(File dir , int maxInt){            if(getFileNum(dir) >= maxBackupIndex ){                File[] files = orderByDate(dir);                for (int i = 0; i <= files.length - maxBackupIndex; i++) {                                File f = files[i];                                f.delete();                        }            }    }        private int getFileNum(File file){                return file.list().length;    }        //将文件按日期排序      public File[] orderByDate(File dir) {         File[] fs = dir.listFiles();         Arrays.sort(fs,new Comparator< File>(){               @Override               public int compare(File f1, File f2) {                         long diff = f1.lastModified() - f2.lastModified();                         if (diff > 0)                                 return 1;                         else if (diff == 0)                                 return 0;                         else                                 return -1;                 }               @Override               public boolean equals(Object obj) {                         return true;                 }           });       return fs;      }          @Override    protected void subAppend(LoggingEvent event) {        super.subAppend(event);          if (fileName != null && qw != null) {              long size = ((CountingQuietWriter) qw).getCount();              if (size >= maxFileSize && size >= nextRollover) {                  rollOver();              }          }      }    }

对应的log4j.properties的配置文件如下

### set log levels ###  log4j.rootLogger = out,E,I  #log4j.logger.com.dear.simpler.dbrpc.util.log.TestUtil=out,Dlog4j.appender.D = com.dear.simpler.dbrpc.util.log.MyLogFileAppender  log4j.appender.D.File = ../../logs/db_logs/debug/DB_0_%s_debug.loglog4j.appender.D.Append = truelog4j.appender.D.MaxFileSize=1024MBlog4j.appender.D.MaxBackupIndex=10log4j.appender.D.Threshold = DEBUG     log4j.appender.D.layout = com.dear.simpler.dbrpc.util.log.ExPatternLayout log4j.appender.D.layout.ConversionPattern = [%d{yyyy/MM/dd HH:mm:ss,SSS}][%T:%t][%p][%F:%L:%M][%m]%nlog4j.appender.E = com.dear.simpler.dbrpc.util.log.MyLogFileAppender  log4j.appender.E.File = ../../logs/db_logs/error/DB_0_%s_error.log    log4j.appender.E.Append = truelog4j.appender.E.MaxFileSize=10MBlog4j.appender.E.MaxBackupIndex=10log4j.appender.E.Threshold = ERROR   log4j.appender.E.layout = com.dear.simpler.dbrpc.util.log.ExPatternLayout  log4j.appender.E.layout.ConversionPattern = [%d{yyyy/MM/dd HH:mm:ss,SSS}][%T:%t][%p][%F:%L:%M][%m]%n log4j.appender.I = com.dear.simpler.dbrpc.util.log.MyLogFileAppender  log4j.appender.I.File = ../../logs/db_logs/info/DB_0_%s_info.log log4j.appender.I.Append = true  log4j.appender.I.MaxFileSize=10MBlog4j.appender.I.MaxBackupIndex=10log4j.appender.I.Threshold = INFO   log4j.appender.I.layout = com.dear.simpler.dbrpc.util.log.ExPatternLayout log4j.appender.I.layout.ConversionPattern = [%d{yyyy/MM/dd HH:mm:ss,SSS}][%T:%t][%p][%F:%L:%M][%m]%n

输出的日志文件命名如下

log4j自定义生成文件的名称

我们在使用Log4j的RollingFileAppender循环生成文件的时候，生成的文件的名称有点儿恶心，例如，文件名称为app.log，那么生成的文件名依次为app.log.1,app.log.2,....

那么如何去改变生成文件的名称的规则呢？下面是一个简单示例：

log4j.properties

log4j.logger.major= INFO, majorMsglog4j.additivity.logError = falselog4j.appender.majorMsg=com.zws.log.MyRollingFileAppenderlog4j.appender.majorMsg.File=${catalina.home}/logs/itc/majorMsg.loglog4j.appender.majorMsg.layout=org.apache.log4j.PatternLayoutlog4j.appender.majorMsg.layout.ConversionPattern=%d{yyyy-MM-dd HH\:mm\:ss}|%p|%C|%M|%L|%m%nlog4j.appender.majorMsg.MaxFileSize=1KBlog4j.appender.majorMsg.MaxBackupIndex=10

MyRollingFileAppender.java

package com.zws.log;import java.io.File;import java.io.IOException;import java.io.InterruptedIOException;import org.apache.log4j.Priority;import org.apache.log4j.RollingFileAppender;import org.apache.log4j.helpers.CountingQuietWriter;import org.apache.log4j.helpers.LogLog;import org.apache.log4j.spi.LoggingEvent;/** *  * @author wensh.zhu * */public class MyRollingFileAppender extends RollingFileAppender { private long nextRollover = 0; public void rollOver() {  File target;  File file;  if (qw != null) {   long size = ((CountingQuietWriter) qw).getCount();   nextRollover = size + maxFileSize;  }  LogLog.debug("maxBackupIndex=" + maxBackupIndex);  boolean renameSucceeded = true;  if (maxBackupIndex > 0) {   //删除序号最大（最早的文件）的文件   file = new File(genFileName(fileName, maxBackupIndex));   if (file.exists())    renameSucceeded = file.delete();   //所有文件名序号加1   for (int i = maxBackupIndex - 1; i >= 1 && renameSucceeded; i--) {    file = new File(genFileName(fileName, i));    if (file.exists()) {     target = new File(genFileName(fileName, i + 1));     renameSucceeded = file.renameTo(target);    }   }   if (renameSucceeded) {    target = new File(genFileName(fileName, 1));    this.closeFile();     file = new File(fileName);    renameSucceeded = file.renameTo(target);    if (!renameSucceeded) {     try {      this.setFile(fileName, true, bufferedIO, bufferSize);     } catch (IOException e) {      if (e instanceof InterruptedIOException) {       Thread.currentThread().interrupt();      }      LogLog.error("setFile(" + fileName + ", true) call failed.", e);     }    }   }  }  if (renameSucceeded) {   try {    this.setFile(fileName, false, bufferedIO, bufferSize);    nextRollover = 0;   } catch (IOException e) {    if (e instanceof InterruptedIOException) {     Thread.currentThread().interrupt();    }    LogLog.error("setFile(" + fileName + ", false) call failed.", e);   }  } } private String genFileName(String name, int index) {  String fileName = "";  if (index > 0) {   String num = index < 10 ? "0" + index : String.valueOf(index);   fileName = name.replace(".log", "") + "_" + num + ".log";  } else {   fileName = name;  }  return fileName; }  protected void subAppend(LoggingEvent event) {  super.subAppend(event);  if (fileName != null && qw != null) {   long size = ((CountingQuietWriter) qw).getCount();   if (size >= maxFileSize && size >= nextRollover) {    rollOver();   }  } }}

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