关于log4j.properties例子:DailyRollingFileAppender

package com.v512.log4j;

import org.apache.log4j.Logger;

public class HelloLog4J {
    // 构造记录器,形参是记录器所在的类,表示要在该类做日志
    private static Logger logger = Logger.getLogger(HelloLog4J.class);
    /**
     * @param args
     */
    public static void main(String[] args) {
        getMessage();
    }

    private static void getMessage() {
        // 记录下各种级别的信息,这些信息放在哪儿,以哪种方式存放,在log4j.properties文件中配置.
        logger.debug("This is debug message.");
        logger.info("This is a info message.");
        logger.warn("This is a warn message.");
        logger.error("This is a error message.");
    }

}

 

log4j.rootLogger=info,file
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.File=Message.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyyMMdd HH:mm:ss} %p %l [%t] %m%n

Message.log.2012-07-28
Message.log.2012-07-27
Message.log(今天)
20120729 11:26:58 INFO com.v512.log4j.HelloLog4J.getMessage(HelloLog4J.java:18) [main] This is a info message.
20120729 11:26:59 WARN com.v512.log4j.HelloLog4J.getMessage(HelloLog4J.java:19) [main] This is a warn message.
20120729 11:26:59 ERROR com.v512.log4j.HelloLog4J.getMessage(HelloLog4J.java:20) [main] This is a error message.