java定时任务

1.监听类继承ServletContextListener

public class MyListen implements ServletContextListener {

private UserMemberService userMemberService;//需要调用的对象

Calendar calendar = Calendar.getInstance(); 

private Timer timer = null;

@Override

public void contextInitialized(ServletContextEvent sce) {

//获取对象，此处对象不能直接bean注入获得，因为spring容器不支持多线程的注入

userMemberService = WebApplicationContextUtils.getWebApplicationContext(sce.getServletContext()).getBean(UserMemberService.class);

//设置每天定时执行时间

calendar.set(Calendar.HOUR_OF_DAY, 24); 

calendar.set(Calendar.MINUTE,0); 

calendar.set(Calendar.SECOND, 0); 

Date time = calendar.getTime();

timer = new Timer(true);

timer.schedule(new MyTask(userMemberService), time);

}

@Override

public void contextDestroyed(ServletContextEvent sce) {

timer.cancel();

}

}

2.

public class MyTask extends TimerTask {

private UserMemberService userMemberService;

public MyTask(UserMemberService userMemberService) {

    this.userMemberService = userMemberService;

  }

@Override

public void run() {

System.out.println(userMemberService==null);//判断对象是否实例化

userMemberService.updateMember();//调用自己的对象方法

}

}

3.web.xml配置监听器

<listener>

<listener-class>

com.huihe.gt.controller.user.member.MyListen

</listener-class>

</listener>