文件的后台下载

Question

我是新手。我有一个程序，我点击一个按钮并开始下载电影，但是当它下载它时，我什么也做不了，所以程序将关闭或仍然冻结（我要下载的文件是2GB。我的下载代码如下所示：

所以我希望我可以在我的程序中做一些事情，如果有人知道我可以如何添加进度条，那么我会看到下载过程如何进行。

if (!"Anschauen".equals(down.getText())) { 
    try (BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("gedown.txt", true)))) { 
     bw.write(titles.getText()); 
     bw.newLine(); 

     String fileName = (titles.getText()+".mp4"); //The file that will be saved on your computer 
     URL link = new URL("http://s180.zerocdn.to/dl/63974fae7073944b11a7cf3e72e36cec/58b0d089/mm59cc5df499f1c21806495fea50072438.mp4"); //The file that you want to download 

     switch (titles.getText()) { 
      case "doesnotmatter": 
       link = new URL("doesnotmatter"); 
       break; 
      case "doesnotmatter": 
       link = new URL("doesnotmatter"); 
       break; 
      case "doesnotmatter": 
       link = new URL("doesnotmatter"); 
       break; 
      case "doesnotmatter": 
       link = new URL("doesnotmatter"); 
       break; 
      case "doesnotmatter": 
       link = new URL("doesnotmatter"); 
       break; 
      case "doesnotmatter": 
       link = new URL("doesnotmatter"); 
       break; 
     } 

     ByteArrayOutputStream out; 
     try (InputStream in = new BufferedInputStream(link.openStream())) { 
      out = new ByteArrayOutputStream(); 
      byte[] buf = new byte[1024]; 
      int n = 0; 
      while (-1!=(n=in.read(buf))) 
      { 
       out.write(buf, 0, n); 
      } 
      out.close(); 
     } 
     byte[] response = out.toByteArray(); 

     FileOutputStream fos = new FileOutputStream(fileName); 
     fos.write(response); 
     fos.close(); 
    } 
} 
else { 
    System.out.println("Noch nicht fertig"); 
} 

Answer 1

您应该使用一个线程（Official Info）

public void run() { 
    //This will be called when the thread starts. 
    //Put the download code right here. 
} 

public static void main(String args[]) { 
    //The class must implement Runnable. 
    Thread thread = new Thread(this, "Thread's name eg. Download Thread"); 
    thread.start(); 
}