多线程例子：网图下载

多线程例子：网图下载

import org.apache.commons.io.FileUtils;

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

//练习Thread，实现多线程同步下载图片
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("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1594717080876&di=fe083e5f436c12d673004789fa9c9398&imgtype=0&src=http%3A%2F%2Fa3.att.hudong.com%2F14%2F75%2F01300000164186121366756803686.jpg","1.jpg");
        TestThread2 t2 = new TestThread2("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1594717290398&di=e0c6f6d72e6678a887b672793129c24e&imgtype=0&src=http%3A%2F%2Fa0.att.hudong.com%2F56%2F12%2F01300000164151121576126282411.jpg","2.jpg");
        TestThread2 t3 = new TestThread2("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1594717332850&di=63815e0cd3207db1c64dab607ecff742&imgtype=0&src=http%3A%2F%2Fa4.att.hudong.com%2F52%2F52%2F01200000169026136208529565374.jpg","3.jpg");

        //多线程，每次都不一样
        t1.start();
        t2.start();
        t3.start();
    }
}

//下载器 看作时一个工具类
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");
        }
    }
}