java定时定点执行任务

public class TaskManager implements ServletContextListener{ private java.util.Timer timer = null; public void contextInitialized(ServletContextEvent event) { timer = new java.util.Timer(true); event.getServletContext().log("定时器已启动"); timer.schedule(new MyTask(event.getServletContext()), 0, 60*60*1000); //每一个小时看一次 event.getServletContext().log("已经添加任务调度表"); } public void contextDestroyed(ServletContextEvent event) { timer.cancel(); event.getServletContext().log("定时器销毁"); } }class MyTask extends TimeTask { private static final int C_SCHEDULE_HOUR = 0; //晚上0点时,执行 private static boolean isRunning = false; private ServletContext context = null; public MyTask(ServletContext context) { this.context = context; } public void run() { Calendar cal = Calendar.getInstance(); if (!isRunning) { if (C_SCHEDULE_HOUR == cal.get(Calendar.HOUR_OF_DAY)) { isRunning = true; context.log("开始执行指定任务"); //TODO 添加自定义的详细任务，以下只是示例 int i = 0; while (i++ < 10) { context.log("已完成任务的" + i + "/" + 10); } 　　　　　　　timerDoSomething(); isRunning = false; context.log("指定任务执行结束"); } } else { context.log("上一次任务执行还未结束"); } } public static timerDoSomething(){ System.out.println("我已经执行了一次了!!!!!"); }}