<servlet>

<servlet-name>TaskTimer</servlet-name>

<servlet-class>com.XXXXX.controller.TaskTimer</servlet-class>

<load-on-startup>2</load-on-startup>

</servlet>

package com.XXX.controller;

import java.util.Date;

import java.util.Timer;

import java.util.TimerTask;

import javax.servlet.http.HttpServlet;

public class TaskTimer extends HttpServlet{

    private static final long serialVersionUID = 1L;

    public void init(){

        Timer timer = new Timer();

        timer.schedule(new TimerTask() {

            public void run() {

                System.out.println(new Date()+"-----Hello !!!");

            }

        }, 1000*5, 1000*3);//第二个参数为多少毫秒后启动，第三个参数为每个多少毫秒执行一次

    }

}

package com.XXXX.controller;

import java.util.Date;

import java.util.List;

import java.util.Map;

import java.util.Timer;

import java.util.TimerTask;

import javax.servlet.ServletContextEvent;

import javax.servlet.http.HttpServlet;

import org.springframework.stereotype.Controller;

import org.springframework.web.context.WebApplicationContext;

import org.springframework.web.context.support.WebApplicationContextUtils;

@Controller

public class TaskTimer extends HttpServlet{

    private static final long serialVersionUID = 1L;

    public void init(){

        final ServletContextEvent sce = new ServletContextEvent(getServletContext());
 

        Timer timer = new Timer();

        timer.schedule(new TimerTask() {

            //获得Spring容器

            WebApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(sce.getServletContext());

            //从Spring容器中获得SelectDataServlet的实例

            private Service service = ctx.getBean(service.class);public void run() {

                System.out.println("已经开始跑定时器");
　　　　　　　　　　//定时器主体，此处可调用service实体

            }

        }, 1000*5, 1000*60*60*24);

    }

}