2、实现runnable接口

实现runnable接口

 

import org.apache.commons.io.FileUtils;

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

public class TestThread2 implements Runnable {

    private String url;//图片地址
    private String name;//保存文件名

    //构造器
    public TestThread2(String url,String name) {
        this.url = url;
        this.name = name;
    }
    //重写run方法
    @Override
    public void run(){
        WebDownload webdownload = new WebDownload();
        webdownload.download(url,name);
        System.out.println("下载的文件名为："+name);
    }

    public static void main(String[] args) {
        TestThread2 thread1 = new TestThread2("https://img-home.csdnimg.cn/images/20220707025239.jpg","123.jpg");
        TestThread2 thread2 = new TestThread2("https://img-home.csdnimg.cn/images/20220707025239.jpg","124.jpg");
        TestThread2 thread3 = new TestThread2("https://img-home.csdnimg.cn/images/20220707025239.jpg","125.jpg");
        //创建线程对象，使用线程开启start，代理
        new Thread(thread1).start();
        new Thread(thread2).start();
        new Thread(thread3).start();
    }

}
//下载图片类
class WebDownload{
    public void download(String url,String filename){
        try {
            //下载图片并重命名
            FileUtils.copyURLToFile(new URL(url),new File(filename));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}