Thread练习 之 下载网图

准备工作：

1. Bing 搜索 commons-io 并下载。 https://commons.apache.org/proper/commons-io/download_io.cgi
2. 把 commons-io 文件夹中的 commons-io-2.8.0.jar 添加到项目中。

复制代码

package com.kuang.demo01;

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

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

    // 下载图片线程的执行体
    @Override
    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) {
        TestThread2 t1 = new TestThread2("http://i0.hdslb.com/bfs/article/42dc7d2fb0239487f316d25ac3bccf6c42409bbc.png","末日三问1.png");
        TestThread2 t2 = new TestThread2("http://i0.hdslb.com/bfs/article/42dc7d2fb0239487f316d25ac3bccf6c42409bbc.png","末日三问2.png");
        TestThread2 t3 = new TestThread2("http://i0.hdslb.com/bfs/article/2387ba9281f22a7845f62c9039deb24c007021a8.jpg","末日三问3.jpg");

        // 启动线程
        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));     //FileUtils 里的工具
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("IO 异常，downloader 方法出现问题");
        }
    }
}