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Runable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("http://image.baidu.com/search/detail?ct=503316480&z=&tn=baiduimagedetail&ipn=d&ie=utf-8&in=24401&cl=2&lm=-1&st=-1&step_word=&rn=1&cs=&ln=1998&fmq=1402900904181_R&ic=0&s=&se=1&sme=0&tab=&width=&height=&face=0&is=&istype=2&ist=&jit=&fr=ala&ala=1&alatpl=others&pos=1&pn=3&word=%E5%9B%BE%E7%89%87%20%E5%8A%A8%E6%BC%AB%E5%8D%A1%E9%80%9A&di=213510&os=4129833545,253122553&pi=0&objurl=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201209%2F02%2F20120902160411_ik2UH.jpeg","D:/d/a.jpg");
  ThreadDownload td2=new ThreadDownload("http://image.baidu.com/search/detail?ct=503316480&z=&tn=baiduimagedetail&ipn=d&ie=utf-8&in=24401&cl=2&lm=-1&st=-1&step_word=&rn=1&cs=&ln=1998&fmq=1402900904181_R&ic=0&s=&se=1&sme=0&tab=&width=&height=&face=0&is=&istype=2&ist=&jit=&fr=ala&ala=1&alatpl=others&pos=1&pn=2&word=%E5%9B%BE%E7%89%87%20%E5%8A%A8%E6%BC%AB%E5%8D%A1%E9%80%9A&di=237600&os=1039188367,1392108594&pi=0&objurl=http%3A%2F%2Fimg.alicdn.com%2Fimgextra%2Fi1%2F3498538608%2FTB2BY1Be8HH8KJjy0FbXXcqlpXa_!!3498538608-0-daren.jpg","D:/d/b.jpg");
  ThreadDownload td3=new ThreadDownload("http://image.baidu.com/search/detail?ct=503316480&z=&tn=baiduimagedetail&ipn=d&ie=utf-8&in=24401&cl=2&lm=-1&st=-1&step_word=&rn=1&cs=&ln=1998&fmq=1402900904181_R&ic=0&s=&se=1&sme=0&tab=&width=&height=&face=0&is=&istype=2&ist=&jit=&fr=ala&ala=1&alatpl=others&pos=1&pn=0&word=%E5%9B%BE%E7%89%87%20%E5%8A%A8%E6%BC%AB%E5%8D%A1%E9%80%9A&di=83710&os=1459185365,1117709152&pi=0&objurl=http%3A%2F%2Fimg.52z.com%2Fupload%2Fnews%2Fimage%2F20180129%2F20180129082229_14849.jpg","c.jpg");

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

  }
  }