如何使用Java在线下载mp3文件？ [英] How to use Java to download a mp3 file online?

问题描述

我使用以下方法下载mp3文件：
http://online1.tingclass.com/lesson/shi0529/43/32.mp3

I used the following method to download an mp3 file at : http://online1.tingclass.com/lesson/shi0529/43/32.mp3

但是我收到以下错误：

java.io.FileNotFoundException：http：\online1.tingclass.com\lesson\shi0529\43\32.mp3（文件名，目录名或卷标签语法不正确）

java.io.FileNotFoundException: http:\online1.tingclass.com\lesson\shi0529\43\32.mp3 (The filename, directory name, or volume label syntax is incorrect)

  public static void Copy_File(String From_File,String To_File)
  {   
    try
    {
      FileChannel sourceChannel=new FileInputStream(From_File).getChannel();
      FileChannel destinationChannel=new FileOutputStream(To_File).getChannel();
      sourceChannel.transferTo(0,sourceChannel.size(),destinationChannel);
      // or
      //  destinationChannel.transferFrom(sourceChannel, 0, sourceChannel.size());
      sourceChannel.close();
      destinationChannel.close();
    }
    catch (Exception e) { e.printStackTrace(); }
  }

然而，如果我手工从浏览器中执行，文件就在那里，我不知道为什么它不起作用，什么是正确的方法？

Yet if I do it from a browser by hand, the file is there, I wonder why it didn't work, and what's the right way to do it ?

Frank

推荐答案

使用旧版Java IO，但您可以将其映射到您正在使用的NIO方法。关键是使用URLConnection。

Using old-school Java IO, but you can map this to the NIO method you are using. Key thing is use of URLConnection.

    URLConnection conn = new URL("http://online1.tingclass.com/lesson/shi0529/43/32.mp3").openConnection();
    InputStream is = conn.getInputStream();

    OutputStream outstream = new FileOutputStream(new File("/tmp/file.mp3"));
    byte[] buffer = new byte[4096];
    int len;
    while ((len = is.read(buffer)) > 0) {
        outstream.write(buffer, 0, len);
    }
    outstream.close();

这篇关于如何使用Java在线下载mp3文件？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！