定时器经常在项目中用到，定制执行某些操作，比如爬虫就需要定时加载种子等操作，之前一直用spring的定制器 近期做项目发现，jdk有很简单的提供   代码如下  1 /*    2  * Copyright (c) 2014-2024 . All Rights Reserved.    3  *    4  * This software is the confidential and proprietary information of    5  * LoongTao. You shall not disclose such Confidential Information    6  * and shall use it only in accordance with the terms of the agreements    7  * you entered into with LoongTao.    8  *    9  */10 package com.loongtao.dmscrawler.temp;11 12 import java.util.Timer;13 import java.util.TimerTask;14 15 /**16  * @declare:测试定时器 
17  * @author: cphmvp18  * @version: 1.019  * @date: 2014-3-14上午11:21:3620  */21 public class TimeTest {22     public static void main(String[] args) {23         System.out.println("start");24         new Timer().schedule(new TestTask(), 0, 1000 * 60 * 60);25         System.out.println("end");26 27     }28 29     static class TestTask extends TimerTask {30         TestTask() {31             // 空构造器32         }33 34         @Override35         public void run() {36             System.out.println(1);37         }38 39     }40 } jdk源码参考 很容易看懂的 ，不解释

1   * @param task   task to be scheduled. 2      * @param delay  delay in milliseconds before task is to be executed. 3      * @param period time in milliseconds between successive task executions. 4      * @throws IllegalArgumentException if delay is negative, or 5      *         delay + System.currentTimeMillis() is negative. 6      * @throws IllegalStateException if task was already scheduled or 7      *         cancelled, timer was cancelled, or timer thread terminated. 8      */ 9     public void schedule(TimerTask task, long delay, long period) {10         if (delay < 0)11             throw new IllegalArgumentException("Negative delay.");12         if (period <= 0)13             throw new IllegalArgumentException("Non-positive period.");14         sched(task, System.currentTimeMillis()+delay, -period);15     }