java定时任务的实现方法

import java.util.Timer;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

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

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

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

}

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
}

}