第自定義log4j日志文件命名規則說明目錄自定義log4j日志文件命名規則根據log4j的API定義自己的FileAppender對應的perties的配置文件如下輸出的日志文件命名如下log4j自定義生成文件的名稱pertiesMyRollingFileAppender.java

自定義log4j日志文件命名規則

項目中的日志需要采用一致的命名規范和文件規范，命名規則為：項目模塊標識_index_日期時間_日志級別.log，且每個級別日志文件放在單獨的文件夾，且每個文件夾下日志的數量不得超過10個，當數量超過限制時，刪除相對較舊的日志，保留較新的日志。

但是發現log4j并不能滿足此要求，于是

根據log4j的API定義自己的FileAppender

代碼如下：

packagecom.dear.simpler.dbrpc.util.log;

importjava.io.File;

importjava.io.IOException;

importjava.io.InterruptedIOException;

importjava.text.SimpleDateFormat;

importjava.util.Arrays;

importjava.util.Comparator;

importjava.util.Date;

importjava.util.concurrent.atomic.AtomicInteger;

importjava.util.regex.Matcher;

importjava.util.regex.Pattern;

importorg.apache.log4j.RollingFileAppender;

importorg.apache.log4j.helpers.CountingQuietWriter;

importorg.apache.log4j.helpers.LogLog;

importorg.apache.log4j.spi.LoggingEvent;

*@authorlixiang

*自定義log文件的命名規則

publicclassMyLogFileAppenderextendsRollingFileAppender{

privatelongnextRollover=0;

privatestaticAtomicIntegerlogIndex=newAtomicInteger(0);//index

publicvoidrollOver(){

Filefile=null;

if(qw!=null){

longsize=((CountingQuietWriter)qw).getCount();

LogLog.debug("rollingovercount="+size);

//ifoperationfails,donotrollagainuntil

//maxFileSizemorebytesarewritten

nextRollover=size+maxFileSize;

LogLog.debug("maxBackupIndex="+maxBackupIndex);

if(maxBackupIndex0){

file=newFile(getRollingFileName(fileName,logIndex.incrementAndGet()));

if(fileExisted(file)){

file=newFile(getRollingFileName(fileName,logIndex.incrementAndGet()));

deleteOldFile(file.getParentFile(),maxBackupIndex);

this.closeFile();

try{

this.setFile(getRollingFileName(fileName,logIndex.get()),false,bufferedIO,bufferSize);

nextRollover=0;

}catch(IOExceptione){

if(einstanceofInterruptedIOException){

Thread.currentThread().interrupt();

LogLog.error("setFile("+fileName+",false)callfailed.",e);

privateStringgetRollingFileName(StringfileName,intindex){//使用正則表達式替代index

Patternp=Ppile("_\\d+\\_");

Matcherm=p.matcher(fileName);

Stringstr=m.replaceFirst(String.format("_%d_",index));

SimpleDateFormatformat=newSimpleDateFormat("yyyyMMddHHmmss");//日期

StringdateString=format.format(newDate(System.currentTimeMillis()));

str=str.replaceAll("\\d{14}",dateString);

returnstr;

publicsynchronizedvoidsetFile(StringfileName,booleanappend,//修改文件名

booleanbufferedIO,intbufferSize)throwsIOException{

SimpleDateFormatformat=newSimpleDateFormat("yyyyMMddHHmmss");//日期

StringdateString=format.format(newDate(System.currentTimeMillis()));

Stringtemp=String.format(fileName,dateString);//文件名

super.setFile(temp,append,bufferedIO,bufferSize);

if(append){

Filef=newFile(temp);

((CountingQuietWriter)this.qw).setCount(f.length());

privatebooleanfileExisted(Filefile){

booleanres=false;

String[]fts=file.getName().split("_");

FileparentFile=file.getParentFile();

for(Filef:parentFile.listFiles()){

String[]fns=f.getName().split("_");

if(fns[0].equals(fts[0])fns[1].equals(fts[1])){

res=true;

break;

returnres;

privatevoiddeleteOldFile(Filedir,intmaxInt){

if(getFileNum(dir)=maxBackupIndex){

File[]files=orderByDate(dir);

for(inti=0;i=files.length-maxBackupIndex;i++){

Filef=files[i];

f.delete();

privateintgetFileNum(Filefile){

returnfile.list().length;

//將文件按日期排序

publicFile[]orderByDate(Filedir){

File[]fs=dir.listFiles();

Arrays.sort(fs,newComparatorFile(){

@Override

publicintcompare(Filef1,Filef2){

longdiff=f1.lastModified()-f2.lastModified();

if(diff0)

return1;

elseif(diff==0)

return0;

else

return-1;

@Override

publicbooleanequals(Objectobj){

returntrue;

returnfs;

@Override

protectedvoidsubAppend(LoggingEventevent){

super.subAppend(event);

if(fileName!=nullqw!=null){

longsize=((CountingQuietWriter)qw).getCount();

if(size=maxFileSizesize=nextRollover){

rollOver();

}

對應的perties的配置文件如下

###setloglevels###

log4j.rootLogger=out,E,I

#.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/ddHH: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/ddHH: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/ddHH:mm:ss,SSS}][%T:%t][%p][%F:%L:%M][%m]%n

輸出的日志文件命名如下

log4j自定義生成文件的名稱

我們在使用Log4j的RollingFileAppender循環生成文件的時候，生成的文件的名稱有點兒惡心，例如，文件名稱為app.log，那么生成的文件名依次為app.log.1,app.log.2,....

那么如何去改變生成文件的名稱的規則呢？下面是一個簡單示例：

perties

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-ddHH\:mm\:ss}|%p|%C|%M|%L|%m%n

log4j.appender.majorMsg.MaxFileSize=1KB

log4j.appender.majorMsg.MaxBackupIndex=10

MyRollingFileAppender.java

packagecom.zws.log;

importjava.io.File;

importjava.io.IOException;

importjava.io.InterruptedIOException;

importorg.apache.log4j.Priority;

importorg.apache.log4j.RollingFileAppender;

importorg.apache.log4j.helpers.CountingQuietWriter;

importorg.apache.log4j.helpers.LogLog;

importorg.apache.log4j.spi.LoggingEvent;

*@authorwensh.zhu

publicclassMyRollingFileAppenderextendsRollingFileAppender{

privatelongnextRollover=0;

publicvoidrollOver(){

Filetarget;

Filefile;

if(qw!=null){

longsize=((CountingQuietWriter)qw).getCount();

nextRollover=size+maxFileSize;

LogLog.debug("maxBackupIndex="+maxBackupIndex);

booleanrenameSucceeded=true;

if(maxBackupIndex0){

//刪除序號最大（最早的文件）的文件

file=newFile(genFileName(fileName,maxBackupIndex));

if(file.exists())

renameSucceeded=file.delete();

//所有文件名序號加1

for(inti=maxBackupIndex-1;i=1renameSucceeded;i--){

file=newFile(genFileName(fileName,i));

if(file.exists()){

target=newFile(genFileName(fileName,i+1));

renameSucceeded=file.renameTo(target);

if(renameSucceeded){

target=newFile(genFileName(fileName,1));

this.closeFile();

file=newFile(fileName);

renameSucceeded=file.renameTo(target);

if(!renameSucceeded){

try{

this.setFile(fileName,true,bufferedIO,bufferSize);

}catch(IOExceptione){

if(einstanceofInterruptedIOException){

Thread.currentThread().interrupt();

LogLog.error("setFile("+fileName+",true)callfailed.",e);

if(renam