Java多线程学习——图片下载

实现多线程方式1：继承类Thread——重写方法run——调用方法start

从网络下载图片首先要增加包commons-io.jar

import org.apache.commons.io.FileUtils;

import java.io.File;

import java.io.IOException;

import java.net.URL;

/**

 * 下载图片

 */

public class WebDownLoader {

    /**

     * 下载工具

     * @param url

     * @param name

     */

    public void download(String url,String name){

        try {

            FileUtils.copyURLToFile(new URL(url),new File(name));

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

public class TDownloader extends Thread{

    String url;

    String name;

    public TDownloader(String url, String name) {

        this.url = url;

        this.name = name;

    }

    @Override

    public void run() {

        WebDownLoader webDownLoader=new WebDownLoader();

        webDownLoader.download(url,name);

    }

    public static void main(String[] args) {

        TDownloader t1=new TDownloader("http://pic28.nipic.com/20130424/3822951_142421949000_2.jpg","photo1.jpg");

        TDownloader t2=new TDownloader("http://pic1.win4000.com/wallpaper/2018-01-23/5a669e431688c.jpg","photo2.jpg");

        TDownloader t3=new TDownloader("http://pic1.win4000.com/wallpaper/6/57a2ea76bcc06.jpg","photo3.jpg");

        t1.start();

        t2.start();

        t3.start();

    }

}

实现多线程方式2：实现Runnable——重写run()方法——new Thread( 实现了Runnable接口的对象 ).start

下载工具类和上面一样，实现多线程的类变了

public class TDownloader implements Runnable{

    String url;

    String name;

    public TDownloader(String url, String name) {

        this.url = url;

        this.name = name;

    }

    @Override

    public void run() {

        WebDownLoader webDownLoader=new WebDownLoader();

        webDownLoader.download(url,name);

    }

    public static void main(String[] args) {

        TDownloader t1=new TDownloader("http://pic28.nipic.com/20130424/3822951_142421949000_2.jpg","photo1.jpg");

        TDownloader t2=new TDownloader("http://pic1.win4000.com/wallpaper/2018-01-23/5a669e431688c.jpg","photo2.jpg");

        TDownloader t3=new TDownloader("http://pic1.win4000.com/wallpaper/6/57a2ea76bcc06.jpg","photo3.jpg");

        new Thread(t1).start();

        new Thread(t2).start();

        new Thread(t3).start();

    }

}

巴特西

Java多线程学习——图片下载

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