javaWeb定時器

2019-11-17 03:57:09

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//這是我的定時器類，用來定時執行某段任務；

package com.my.time;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;

public class BugxmlTimer  {
   public   Timer timer;


   public void timerStart(){
       timer = new Timer();
       Date datetime=new Date();
       Date midnightDate=new Date();

       SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd");
       SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    try {

        midnightDate = sdf2.parse(sdf1.format(datetime)+" 23:00:00");
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.PRintStackTrace();
    }

        long in=midnightDate.getTime()-datetime.getTime();

        System.out.println("before task");
//立刻執行，然后每隔30s執行一次
        timer.schedule(new BugXmlTimerTask(), 0,30000);


   }

   public void timerStop(){
       if(timer!=null)
          timer.cancel();
   }

   public static void main(String[] args){
        BugXmlTimer myTimer=new BugXmlTimer();


            // TODO Auto-generated method stub
        myTimer.timerStart();

   }
}

//這是執行任務的類，即每隔一段時間要做的事情在這里

package com.my.time;

import java.util.TimerTask;

public class BugXmlTimerTask extends TimerTask {
    @Override
    public void run() {
           System.out.print("run task");
     }
}
//以下是出發定時操作的類，該類繼承了ServletContextListener

public class MyTimerListener implements ServletContextListener {
    private BugXmlTimer  mytimer = new BugXmlTimer  ();
    public void contextInitialized(ServletContextEvent event) {
        mytimer.timerStart();
    }

    public void contextDestroyed(ServletContextEvent event) {
        mytimer.timerStop();
    }
}

然后在web.xml里部署一下，即可在程序啟動后運行定時器了！

<listener>
        <listener-class>com.my.time.MyTimerListener </listener-class>
</listener>

本文來自CSDN博客，轉載請標明出處：http://blog.csdn.net/huangdaosheng110/archive/2009/12/17/5026645.aspx

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