Java多线程学习——图片下载

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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();
}
}