log4j在项目中的应用

1：首先导入需要的jar包

2：创建log4j.properties文件

log4j.rootLogger=info,stdout

#log4j.rootLogger=error,daily_file

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n

log4j.appender.daily_file=org.apache.log4j.DailyRollingFileAppender

log4j.appender.daily_file.DatePattern = -yyyy-MM-dd

log4j.appender.daily_file.layout=org.apache.log4j.PatternLayout

log4j.appender.daily_file.layout.ConversionPattern = %d{MM-dd HH:mm:ss},%-5p [%r] [%t] %c{2} - %m%n

log4j.appender.daily_file.File =log.log/log4j.log

3：在web.xml中配置

log4jConfigLocation

classpath:log4j.properties//log4j.properties文件下的绝对路径

4：然后即可使用啦，例子：

private static Logger log = Logger.getLogger(TextController.class);

http://log.info("这是Info级别");