java定时任务

 【转载:http://www.blogjava.net/fastunit/archive/2008/02/15/180116.html

 本例依据Java自身提供的接口实现,通过监听器(Listener)和定时器(Timer)定时执行某个任务(Task)。
专业的开源工具可参考Quartz:http://www.opensymphony.com/quartz/
MyListener:

import java.util.Timer;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class MyListener implements ServletContextListener {
  
  private Timer timer = null;

  public void contextInitialized(ServletContextEvent event) {
    timer = new Timer(true);
    //设置任务计划,启动和间隔时间
    timer.schedule(new MyTask(), 0, 86400000);
  }

  public void contextDestroyed(ServletContextEvent event) {
    timer.cancel();
  }
  
}

 MyTask:

import java.util.TimerTask;

public class MyTask extends TimerTask {

  public void run() {
    // System.out.println("call at " + (new Date()));
    // TODO 此处添加具体任务代码
  }

}

 web.xml配置:

<listener>
<listener-class>com.fastunit.samples.listener.MyListener</listener-class>
</listener>


 

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