JAVA WEB项目定时执行任务

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1.创建类实现接口 ServletContextListener

2.实现方法contextInitialized（初始化）和contextDestroyed（销毁）

package com.baosight.webapp.util;import java.util.Date;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;public class SaveFile implements ServletContextListener {@Overridepublic void contextDestroyed(ServletContextEvent arg0) {System.out.println("+++++++++++++++++++Game Over");}@Overridepublic void contextInitialized(ServletContextEvent arg0) {Runnable runnable = new Runnable() {            public void run() {                // task to run goes here            System.out.println("============time:"+new Date());                System.out.println("Hello !!");            }        };        ScheduledExecutorService service = Executors                .newSingleThreadScheduledExecutor();        System.out.println(new Date());        //第一个参数是触发事件s，第二个参数是执行延迟时间s，第三个参数是时间间隔        service.scheduleAtFixedRate(runnable, 1, 10, TimeUnit.SECONDS);}public static void main(String[] args) {Date date=new Date();//下周一0点据当前时间的秒数int interval = (7 - date.getDay() + 1)*24*3600 - date.getHours()*3600 - date.getMinutes()*60 - date.getSeconds();}}

3.web.xml文件监听类

 <listener><listener-class>com.baosight.webapp.util.SaveFile</listener-class></listener>

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