log4j详解

log4j.properties配置代码：

## loggers definition Level DEBUG INFO WARN ERROR FATAL

log4j.rootLogger=DEBUG, stdout, log, errorlog  

  
###Console ###  
log4j.appender.stdout = org.apache.log4j.ConsoleAppender  
log4j.appender.stdout.Target = System.out  
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout  
log4j.appender.stdout.layout.ConversionPattern =  %d{ABSOLUTE} [ %t ] [ %p ]:%L - %m%n  
  
### Log ###    
log4j.appender.log = org.apache.log4j.DailyRollingFileAppender  
log4j.appender.log.File = D:/ERPLog/logs/log.log  
log4j.appender.log.Append = true  
log4j.appender.log.Threshold = DEBUG  
log4j.appender.log.DatePattern='_'yyyy-MM-dd'.log'  
log4j.appender.log.layout = org.apache.log4j.PatternLayout  
log4j.appender.log.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss} [ %t ] [%p]:%L %m%n  
  
### Error ###  
log4j.appender.errorlog = org.apache.log4j.DailyRollingFileAppender 
log4j.appender.errorlog.File = D:/ERPLog/logs/errorLog.log
log4j.appender.errorlog.Append = true  
log4j.appender.errorlog.Threshold = ERROR   
log4j.appender.errorlog.DatePattern='_'yyyy-MM-dd'.log'  
log4j.appender.errorlog.layout = org.apache.log4j.PatternLayout  
log4j.appender.errorlog.layout.ConversionPattern =%d{yyyy-MM-dd HH:mm:ss} [ %t ] [%p]:%L %m%n 

具体讲解参见 http://www.baike.com/wiki/log4j