EJB 定时服务Timer Service

下面例子在session bean 中定义了一个定时器，定时器每个3秒钟触发一次事件，当定时事件触发次数超过5次的时候便终止定时器的执行。 1. TimerServiceDao.java (接口) package com.foshanshop.ejb3; public interface TimerServiceDao { public void scheduleTime (long milliseconds); } //end interface 2. TimerServiceBean.java package com.foshanshop.ejb3Impl; import java.util.Date; import javax.annotation.Resource; import javax.ejb.Remote; import javax.ejb.Stateless; import javax.ejb.Timeout; import javax.ejb.Timer; import javax.ejb.TimerService; import com.foshanshop.ejb3.TimerServiceDao; @Stateless @Remote(TimerServiceDao.class) public class TimerServiceBean implements TimerServiceDao{ private static int count = 0 ; @Resource private TimerService timerService ; //直接注入定时服务 @Override public void scheduleTime(long milliseconds) { if(count == 0){ count = 1 ; timerService.createTimer( new Date(new Date().getTime() + milliseconds), milliseconds, "我的第一个定时器"); } } /** * 创建定时器后还需要添加定时事件的回调方法。 * 回调方法使用@javax.ejb.Timeout注释标注， * 必须返回void，并接受一个javax.ejb.Timer类型的参数。 * @param timer */ @Timeout public void timeoutHandler(Timer timer){ System.out.println("--------------第"+count+"次----------------------"); System.out.println("定时器事件发生，传进的参数为：" + timer.getInfo()); if(count >= 5){ timer.cancel(); //如果定时器触发5次便终止定时器 count = 0 ; }else{ count ++ ; } } } //end bean 3.index.jsp <%@ page import="java.util.*" pageEncoding="UTF-8" language="java"%> <%@ page import="com.foshanshop.ejb3.*,javax.naming.*" %>