多线程图片下载

多线程图片下载

先引入一个jar包

public class ThreadTest02 extends Thread{
    private String url;   //网络地址
    private String name;  //文件名

    public ThreadTest02(String url,String name){
        this.url = url;
        this.name = name;
    }

    //下载图片的执行体
    @Override
    public void run() {
        WebDownLoad webDownLoad = new WebDownLoad();
        webDownLoad.downLoad(url,name);
        System.out.println("文件名："+name);
    }

    //练习：Thread ,实现多线程下载图片
    public static void main(String[] args) {
        ThreadTest02 th1 = new ThreadTest02("https://img.yalayi.net/d/file/2020/07/24/b6c4ac6b58124d7ac70344ea4992ab5d.jpg","xg1.jpg");
        ThreadTest02 th2 = new ThreadTest02("https://img.yalayi.net/d/file/2020/06/22/13c501bca19b48eb558b4147493330f4.jpg","xg2.jpg");
        ThreadTest02 th3 = new ThreadTest02("https://img.yalayi.net/d/file/2020/06/22/f49a10d2884df025bba6ced8e50cfa2f.jpg","xg3.jpg");
        //下载次序每次都会不同
        th1.start();
        th2.start();
        th3.start();
    }
}

class WebDownLoad{
    //下载方法
    public void downLoad(String url,String name){
        try {
            FileUtils.copyURLToFile(new URL(url),new File(name));
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("IO异常，downLoad方法");
        }
    }
}