java_Timer_schedule jdk自带定时器

java_Timer_schedule jdk自带定时器
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 <br> 17 * @author: cphmvp 18 * @version: 1.0 19 * @date: 2014-3-14上午11:21:36 20 */ 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 @Override 35 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

java_Timer_schedule jdk自带定时器
 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 <tt>delay</tt> is negative, or
 5      *         <tt>delay + System.currentTimeMillis()</tt> 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     }
java_Timer_schedule jdk自带定时器

 

java_Timer_schedule jdk自带定时器

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java_Timer_schedule jdk自带定时器

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