网图下载

网图下载

1. 导入commons-io包

---

import org.apache.commons.io.FileUtils;

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

//联系Thread,实现多线程同步下载图片
public class Demo extends Thread{

    private String url;//网络图片地址
    private String name;//保存的文件名

    public Demo(String url,String name){
        this.url = url;
        this.name = name;
    }
    @Override
    //下载图片线程的执行体
    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) {
        Demo t1 = new Demo("https://gitee.com/hlgzw/picture-bed/raw/master/img/20210120173738.png","t1.jpg");
        Demo t2 = new Demo("https://gitee.com/hlgzw/picture-bed/raw/master/img/20210120173738.png","t2.jpg");
        Demo t3 = new Demo("https://gitee.com/hlgzw/picture-bed/raw/master/img/20210120173738.png","t3.jpg");

        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");
        }
    }
}

---

因为t1,t2,t3是并行的，下载完成顺序是随机的。