java 多線程-同時在網(wǎng)上下載多個圖片

*** 創(chuàng)建多線程的三種方式

• 繼承Thread類，重寫Run方法
  實現(xiàn)Runnable接口，重寫run方法
• 實現(xiàn)callable接口，重寫call方法
• 繼承Thread類，重寫run方法，類名.start()啟動線程

• 實現(xiàn)Runable接口，重寫run方法，new Thread(類對象).start();
  **

  public class commons extends Thread{
  //run是線程的入口點
  
  public void download(String url,String name)
  {
  try {
  FileUtils.copyURLToFile(new URL(url), new File(name));
  } catch (MalformedURLException e) {
  
  e.printStackTrace();
  System.out.println("不合法的路徑");
  } catch (IOException e) {
  
  e.printStackTrace();
  System.out.println("圖片下載失敗");
  }
  }

  }

  //開啟下載:
  public class ThreadDownload extends Thread {
  private String url; //遠程路徑
  private String name; //存儲名字

  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");

  //啟動三個線程
  td.start();
  td2.start();
  td3.start();

  }
  }