Timer实现定时触发实例

最新推荐文章于 2021-12-15 08:00:00 发布

amu0324

最新推荐文章于 2021-12-15 08:00:00 发布

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分类专栏： JAVA 文章标签： timer calendar 任务调度 exception class 任务

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先写个实现具体功能的task

public class WebServiceTask extends TimerTask{ private ServletContext context; private static boolean isRunning = false; private static boolean flag = true; private static final int C_SCHEDULE_HOUR = 11; public WebServiceTask(ServletContext context){ this.context = context; } public void run() { Calendar cal = Calendar.getInstance(); if (!isRunning) { if (C_SCHEDULE_HOUR == cal.get(Calendar.HOUR_OF_DAY) && flag) { isRunning = true; System.out.println("开始同步！"); try { //具体实现代码 } catch (Exception e) { e.printStackTrace(); } isRunning = false; flag = false; System.out.println("执行指定任务"); } } else { System.out.println("上一次任务执行还未结束"); } if(C_SCHEDULE_HOUR != cal.get(Calendar.HOUR_OF_DAY)){ flag = true; } }

接下来写个Listener

public class WorkServiceImpl implements ServletContextListener{ private Timer timer; private WebServiceTask webServiceTask; public void contextDestroyed(ServletContextEvent event) { timer.cancel(); System.out.println("定时器已销毁"); } public void contextInitialized(ServletContextEvent event) { timer = new Timer(true); webServiceTask = new WebServiceTask(event.getServletContext()); System.out.println("定时器已启动"); timer.schedule(webServiceTask, 0, 60 * 60 * 1000); System.out.println("已经添加任务调度表"); } }

然后在web.xml中配置Listener

<listener> <listener-class>Listener</listener-class> </listener>