需要下載commons.io jar包

package DemoThread;

import org.apache.commons.io.FileUtils;

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

public class TestThread01 extends Thread {
    public String url;//網路圖片地址
    public String name;//儲存的檔名

    public TestThread01(String url,String name ){
    
 
this.url=url;
    this.name=name;


    }

    @Override
    public void run() {
        WebDownLoader webDownLoader = new WebDownLoader();
        webDownLoader.downloader(url,name);
        System.out.println("下載了檔名為"+name);
    }

    public static void main(String[] args) {
        TestThread01 testThread01 
 
= new TestThread01("https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=2693817768,1815009225&fm=26&gp=0.jpg","11.jpg");
        testThread01.start();
    }
}

class WebDownLoader{
    //下載方法
    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異常，downloader方法出現問題！");
        }
    }
}