java 多线程-同时在网上下载多个图片

*** 创建多线程的三种方式

• 继承Thread类，重写Run方法
  实现Runnable接口，重写run方法
• 实现callable接口，重写call方法
• 继承Thread类，重写run方法，类名.start()启动线程

• 实现Runable接口，重写run方法，new Thread(类对象).start();
  **

  public class commons extends Thread{
  //run是线程的入口点
  
  public void download(String url,String name)
  {
  try {
  FileUtils.copyURLToFile(new URL(url), new File(name));
  } catch (MalformedURLException e) {
  
  e.printStackTrace();
  System.out.println("不合法的路径");
  } catch (IOException e) {
  
  e.printStackTrace();
  System.out.println("图片下载失败");
  }
  }

  }

  //开启下载:
  public class ThreadDownload extends Thread {
  private String url; //远程路径
  private String name; //存储名字

  public ThreadDownload(String url,String name)
  {
  this.url=url;
  this.name=name;
  }
  public void run()
  {
  commons wd=new commons();
  wd.download(url, name);
  }

  public static void main(String[]args)
  {
  ThreadDownload td =new ThreadDownload("https://cache.yisu.com/upload/information/20200311/58/227722.jpg","D:/d/a.jpg");
  ThreadDownload td2=new ThreadDownload("https://cache.yisu.com/upload/information/20200311/58/227723.jpg","D:/d/b.jpg");
  ThreadDownload td3=new ThreadDownload("https://cache.yisu.com/upload/information/20200311/58/227724.jpg","c.jpg");

  //启动三个线程
  td.start();
  td2.start();
  td3.start();

  }
  }