java多线程4-网图下载-优快云博客

本文链接：https://blog.youkuaiyun.com/wzwnbnb/article/details/128520962

该代码示例展示了如何使用Java创建多线程下载网络图片。每个线程负责下载一张图片，利用`WebDownloader`类的`downloader`方法通过ApacheCommonsIO库将URL内容保存到本地文件。主程序创建三个线程并启动，尝试同时下载三张相同的图片。

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java多线程4-网图下载

package com.oop.demo01;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.net.URL;

//练习Thread多线程同步下载图片,实现多线程同时下载图片
public class TestThread2 extends Thread{
    private String url;//网络图片地址
    private String name;//保存的文件名
    public TestThread2(String url,String name){
        this.url = url;
        this.name = name;
    }
    //下载图片线程的执行体
    @Override
    public void run() {
        WebDownloader webDownloader = new WebDownloader();
        webDownloader.downloader(url,name);
        System.out.println("下载了文件名为"+name);
    }

    public static void main(String[] args) {
        TestThread2 t1 = new TestThread2("https://i0.hdslb.com/bfs/activity-plat/static/ebab0943c5e811ff9bf1c107d9e1b92a/YvEFW5qWe1_w1920_h1080.png","1.png");
        TestThread2 t2 = new TestThread2("https://i0.hdslb.com/bfs/activity-plat/static/ebab0943c5e811ff9bf1c107d9e1b92a/YvEFW5qWe1_w1920_h1080.png","2.png");
        TestThread2 t3 = new TestThread2("https://i0.hdslb.com/bfs/activity-plat/static/ebab0943c5e811ff9bf1c107d9e1b92a/YvEFW5qWe1_w1920_h1080.png","3.png");
        
        t1.start();
        t2.start();
        t3.start();
    }
}
//下载器
class WebDownloader{
    //下载方法
    public  void  downloader(String url,String name ){
        try {
            FileUtils.copyURLToFile(new URL(url),new File(name));
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("IO异常,downloader方法出现问题");
        }
    }
}