继承Thread类练习-多线程下载图片

继承Thread类练习-多线程下载图片

附上视频连接https://www.kuangstudy.com/course/play/1317506465254887425

准备工作

1. 在java目录下新建lib目录，下载commons.io包（org.apache）jar包文件放在lib目录下；

2. 右键点击lib目录->Add as Library

代码：

package com.example.multi_thread;

import org.apache.commons.io.FileUtils;

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

public class TestThread2 extends Thread {
    private String url;
    private String imageName;

    public TestThread2(String url, String imageName) {
        this.url = url;
        this.imageName = imageName;
    }

    @Override
    public void run() {
        WebDownloader webDownloader = new WebDownloader();
        webDownloader.download(url, imageName);
        System.out.println("下载了图片：" + imageName);
    }

    public static void main(String[] args) {
        TestThread2 t1 = new TestThread2("https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png", "D:\\old_drive_F\\项目\\2021\\demo_kunag\\src\\main\\java\\com\\example\\multi_thread\\1.jpg");
        TestThread2 t2 = new TestThread2("https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png", "D:\\old_drive_F\\项目\\2021\\demo_kunag\\src\\main\\java\\com\\example\\multi_thread\\2.jpg");
        TestThread2 t3 = new TestThread2("https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png", "D:\\old_drive_F\\项目\\2021\\demo_kunag\\src\\main\\java\\com\\example\\multi_thread\\3.jpg");
        t1.start();
        t2.start();
        t3.start();
    }

}

class WebDownloader {

    public void download(String url, String imageName) {
        try {
            FileUtils.copyURLToFile(new URL(url), new File(imageName));
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("IO异常，downloader方法出现问题");
        }

    }
}

运行结果

下载了图片：D:\old_drive_F\项目\2021\demo_kunag\src\main\java\com\example\multi_thread\2.jpg
下载了图片：D:\old_drive_F\项目\2021\demo_kunag\src\main\java\com\example\multi_thread\1.jpg
下载了图片：D:\old_drive_F\项目\2021\demo_kunag\src\main\java\com\example\multi_thread\3.jpg