Java commons io包实现多线程同步图片下载入门教程

package Thread;

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 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);
    }
//下面的URL是在我自己的博客中找的图片的url。
    public static void main(String[] args) {
        TestThread2 t1 = new TestThread2("https://img-blog.csdnimg.cn/20210410190908144.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzUyMDUwNzY5,size_16,color_FFFFFF,t_70#pic_center","1.jpg");
        TestThread2 t2 = new TestThread2("Https://profile.csdnimg.cn/7/F/2/3_qq_52050769","2.jpg");
        TestThread2 t3 = new TestThread2("https://img-home.csdnimg.cn/images/20201124032511.png","3.jpg");
        //先下载t1,t2,t3。但是是同时执行的，多线程！
        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));
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("IO异常，downloader方法出现问题");
        }
    }
}

package Thread;

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 TestThread2 implements Runnable{
    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://img-blog.csdnimg.cn/20210410190908144.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzUyMDUwNzY5,size_16,color_FFFFFF,t_70#pic_center","1.jpg");
        TestThread2 t2 = new TestThread2("https://profile.csdnimg.cn/7/F/2/3_qq_52050769","2.jpg");
        TestThread2 t3 = new TestThread2("https://img-home.csdnimg.cn/images/20201124032511.png","3.jpg");
        //先下载t1,t2,t3。但是是同时执行的，多线程！
        new Thread(t1).start();
        new Thread(t2).start();
        new Thread(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");
        }
    }
}