Log4j简单用法

log4j需要的类包

commons-logging.jar

log4j-1.2.16.jar

一个最简单的用法如下：

import org.apache.log4j.*;

public class simpleLog4j {

	static Logger logger = Logger.getLogger(simpleLog4j.class.getName());
	
	public static void main(String[] args) {
		//加载配置文件
		PropertyConfigurator.configure("log4j.properties");
		//日志输出
		logger.info("simple log4j test.");
	}
}

 

log4j.properties配置如下，配置文件的书写方式在博客的收藏中：

log4j.rootLogger= INFO, CONSOLE, FILE

#use for console
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Target=System.out 
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout 
log4j.appender.CONSOLE.layout.ConversionPattern=%5p [%t] (%F:%l) - %m%n

#use for file
log4j.appender.FILE=org.apache.log4j.RollingFileAppender 
log4j.appender.FILE.File=Arbiter.log 
# Control the maximum log file size 
log4j.appender.FILE.MaxFileSize=100KB 
# Archive log files (one backup file here) 
log4j.appender.FILE.MaxBackupIndex=1 

log4j.appender.FILE.layout=org.apache.log4j.PatternLayout 
log4j.appender.FILE.layout.ConversionPattern=%d{yyyy-MM-dd hh:mm:ss}:%p %t %c - %m%n