java定时任务的实现方法

package com.ucap.sms;

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);
    }

}

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
  }

}

webxml配置

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