经典的log4j.properties配置文件模板

log4j.rootLogger=INFO,CONSOLE
log4j.addivity.org.apache=true

# console
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Threshold=INFO
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.Encoding=UTF-8
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[demo] %-5p %d{yyyy-MM-dd HH\:mm\:ss} - %C.%M(%L)[%t] - %m%n

# all
log4j.logger.com.demo=INFO, DEMO
log4j.appender.DEMO=org.apache.log4j.RollingFileAppender
log4j.appender.DEMO.File=${catalina.base}/logs/demo.log
log4j.appender.DEMO.MaxFileSize=50MB
log4j.appender.DEMO.MaxBackupIndex=3
log4j.appender.DEMO.Encoding=UTF-8
log4j.appender.DEMO.layout=org.apache.log4j.PatternLayout
log4j.appender.DEMO.layout.ConversionPattern=[demo] %-5p %d{yyyy-MM-dd HH\:mm\:ss} - %C.%M(%L)[%t] - %m%n

更加详细的讲解请参考：http://blog.sina.com.cn/s/blog_5ed94d710101go3u.html