Java中log4j 的使用

package com.cn.test;import java.util.concurrent.TimeUnit;import org.apache.log4j.Level;import org.apache.log4j.Logger;public class Lo4jTest {/* Get actual class name to be printed on */static Logger log = Logger.getLogger(Lo4jTest.class.getName());public static void main(String[] args) throws InterruptedException {log.setLevel(Level.ALL);log.trace("Trace Message!");log.debug("Debug Message!");log.info("Info Message!");log.warn("Warn Message!");log.error("Error Message!");TimeUnit.SECONDS.sleep(5);log.fatal("Fatal Message!");}}

参考：http://www.w3cschool.cn/java/log4j-installation.html