自定义log4j日志文件命名规则说明
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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;
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,D
log4j.appender.D = com.dear.simpler.dbrpc.util.log.MyLogFileAppender
log4j.appender.D.File = ../../logs/db_logs/debug/DB_0_%s_debug.log
log4j.appender.D.Append = true
log4j.appender.D.MaxFileSize=1024MB
log4j.appender.D.MaxBackupIndex=10
log4j.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]%n
log4j.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 = true
log4j.appender.E.MaxFileSize=10MB
log4j.appender.E.MaxBackupIndex=10
log4j.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=10MB
log4j.appender.I.MaxBackupIndex=10
log4j.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, majorMsg
log4j.additivity.logError = false
log4j.appender.majorMsg=com.zws.log.MyRollingFileAppender
log4j.appender.majorMsg.File=${catalina.home}/logs/itc/majorMsg.log
log4j.appender.majorMsg.layout=org.apache.log4j.PatternLayout
log4j.appender.majorMsg.layout.ConversionPattern=%d{yyyy-MM-dd HH\:mm\:ss}|%p|%C|%M|%L|%m%n
log4j.appender.majorMsg.MaxFileSize=1KB
log4j.appender.majorMsg.MaxBackupIndex=10MyRollingFileAppender.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;
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();
}
}
}
}
以上示例将文件名的生成规则为：如果文件名为app.log，那么后续的文件为app_01.log,app_02.log.
仅为个人经验，希望能给大家一个参考，也希望大家多多支持编程网
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