普通的log4j.properties 定义：
### set log levels ###
log4j.rootLogger = debug,D,E
## Disable other log
log4j.logger.org.springframework=OFF
log4j.logger.org.apache.struts2=OFF
log4j.logger.com.opensymphony.xwork2=OFF
log4j.logger.com.ibatis=OFF
log4j.logger.org.hibernate=OFF
## INFO
log4j.logger.stats=DEBUG,F_INFO
log4j.additivity.stats=false
log4j.appender.F_INFO=org.apache.log4j.DailyRollingFileAppender
log4j.appender.F_INFO.Threshold=INFO
log4j.appender.F_INFO.File = E://logs/stats.log
log4j.appender.F_INFO.DatePattern='_'yyyy-MM-dd'.log'
log4j.appender.F_INFO.MaxFileSize=128KB
log4j.appender.F_INFO.MaxBackupIndex=3
log4j.appender.F_INFO.Encoding=UTF-8
log4j.appender.F_INFO.layout=org.apache.log4j.PatternLayout
log4j.appender.F_INFO.layout.ConversionPattern=%d{yyyy-MM-dd HH\:mm\:ss} [%-5p][%t] method\:%l%n %m%n
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = E://logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =E://logs/error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n ### 
