1、log4j的配置与使用

#可以设置级别：debug>info>error  

#debug：显示debug、info、error  

#info：显示info、error  

#error：只error  

log4j.rootLogger=fetal,appender1  

#log4j.rootLogger=info,appender1  

#log4j.rootLogger=error,appender1  

      

#输出到控制台  

log4j.appender.appender1=org.apache.log4j.ConsoleAppender  

#样式为TTCCLayout  

log4j.appender.appender1.layout=org.apache.log4j.PatternLayout

log4j.appender.CONSOLE.layout.ConversionPattern = [framework] % d - % c -%- 4r [ % t] %- 5p % c % x - % m % n

package com.coderdream.log4j;

import org.apache.commons.logging.LogFactory;

import org.apache.commons.logging.Log;



public class HelloLog4j {



    private static Log log = LogFactory.getLog("HelloLog4j.class");

    /**

     * @param args

     */

    public static void main(String[] args) {

        // System.out.println("This is println message.");

        System.out.println(log.getClass());

        // 记录debug级别的信息

        log.debug("This is debug message.");

        // 记录info级别的信息

        log.info("This is info message.");

        // 记录error级别的信息

        log.error("This is error message.");

        log.warn("this is warn message");

    }

}