java 多线程下载包 java多线程下载图片

通过继承Thread实现线程

第一步导入commons-io jar包，里面已经封装好了工具，可以直接使用

 

首先创建一个图片下载方法

class WebDownload{
    //下载方法
    public void downloader(String url,String name){
        try {
            FileUtils.copyURLToFile(new URL(url),new File(name));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

具体实现

public class TestThread extends Thread{
    private String url;
    private String name;
    public TestThread(String url,String name){
        this.url=url;
        this.name=name;
    }

    @Override
    public void run() {
        WebDownload webDownload = new WebDownload();
        webDownload.downloader(url,name);
        System.out.println("下载了文件为："+name);
    }

    public static void main(String[] args) {
        TestThread t1 = new TestThread("https://i01piccdn.sogoucdn.com/aa9f24026a5cbd65","1.jpg");
        TestThread t2 = new TestThread("https://i01piccdn.sogoucdn.com/166d76632f06b0ce","2.jpg");
        TestThread t3 = new TestThread("https://i01piccdn.sogoucdn.com/aa9f24026a5cbd65","3.jpg");
        TestThread t4 = new TestThread("https://i04piccdn.sogoucdn.com/d961201dbd742bbc","4.jpg");
        t1.start();
        t2.start();
        t3.start();
        t4.start();
    }

}