从选定的目录中播放MP3文件

Question

我试图从用户选择的文件夹播放歌曲。基本上，我使用我创建的自己的队列，并且正在获得正确的路径。

在下面的代码中，我使用了一个Var称为路径。路径是“C：\ Users \ Shaun \ Downloads \ TestMusic \ Ed Sheeran - You.mp3的形状”。当我将路径定义为“Ed Sheeran - You.mp3的形状”时。有用！这告诉我这看起来是项目开始或运行的目录。

那么，如何让它从任何给定的目录播放文件？

我指的'路径'下面是“public void handlecentreButtonClick（）”。

public class graphicalController implements Initializable 
{ 
    //GUI Decleration 
    public Button centreButton; 
    public Button backButton; 
    public Button forwardButton; 
    public ToggleButton muteToggle; 
    public MenuItem loadFolder; 

    //Controller Decleration 
    String absolutePath; 
    SongQueue q = new SongQueue(); 
    MediaPlayer player; 

    @Override 
    public void initialize(URL location, ResourceBundle resources) 
    { 
     centreButton.setStyle("-fx-background-image: url('/Resources/Play_Button.png')"); 
     centreButton.setText(""); 

     backButton.setStyle("-fx-background-image: url('/Resources/Back_Button.png')"); 
     backButton.setText(""); 

     forwardButton.setStyle("-fx-background-image: url('/Resources/Forward_Button.png')"); 
     forwardButton.setText(""); 

     muteToggle.setStyle("-fx-background-image: url('/Resources/ToggleSound_Button.png')"); 
     muteToggle.setText(""); 
    } 

    public void handlecentreButtonClick() { 
     if(!(q.isEmpty())) { 
      String file = q.peek().fileName.toString(); 
      String path = absolutePath + "\\" + file; 
      Media song = new Media(path); 
      player = new MediaPlayer(song); 
      player.play(); 
     } 
    } 

    public void handleforwardButtonClick() { 
     System.out.println("Hello."); 
     centreButton.setText("Hello"); 
    } 

    public void handlebackButtonClick() { 
     System.out.println("Hello."); 
     centreButton.setText("Hello"); 
    } 

    public void handleLoadButtonClick() { 
     DirectoryChooser directoryChooser = new DirectoryChooser(); 
     File selectedDirectory = directoryChooser.showDialog(null); 
     absolutePath = selectedDirectory.getAbsolutePath(); 
     String path = absolutePath; 
     loadFilesFromFolder(path); 
    } 

    public void loadFilesFromFolder(String path) { 
     File folder = new File(path); 
     File[] listOfFiles = folder.listFiles(); 
     while(!(q.isEmpty())) 
     { 
      try {Thread.sleep(500);}catch (Exception e){} 
      Song j = q.pop(); 
     } 
     int listLength = listOfFiles.length; 
     for (int k = 0; k < listLength; k++) { 
      if (listOfFiles[k].isFile()) { 
       String fileName = listOfFiles[k].getName(); 
       String fileNamePath = path + "\\" +fileName; 
       try { 
        InputStream input = new FileInputStream(new File(fileNamePath)); 
        ContentHandler handler = new DefaultHandler(); 
        Metadata metadata = new Metadata(); 
        Parser parser = new Mp3Parser(); 
        ParseContext parseCtx = new ParseContext(); 
        parser.parse(input, handler, metadata, parseCtx); 
        input.close(); 
        String songName = metadata.get("title"); 
        String artistName = metadata.get("xmpDM:artist"); 
        String albumName = metadata.get("xmpDM:genre"); 
        int id = k + 1; 
        Song newSong = new Song(id, fileName, songName, artistName, albumName); 
        q.push(newSong); 
       } catch (FileNotFoundException e) { 
        e.printStackTrace(); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } catch (SAXException e) { 
        e.printStackTrace(); 
       } catch (TikaException e) { 
        e.printStackTrace(); 
       } 
      }  
     } 
    } 

} 

Answer 1

使用

Media song = new Media(new File(path).toURI().toString()); 

我强烈建议您构造文件独立于平台的方式，但是，而不是硬编码具体到一个特定的文件系统中的文件分隔符。你可以做

File path = new File(absolutePath, file); 
Media song = new Media(path.toURI().toString()); 

Answer 2

随着@James_D的帮助...

你不能：

媒体歌=新媒体（“C：\用户\肖恩\下载\ TestMusic \红发艾德 - You.mp3的形状“）;

这将尝试从您启动程序的位置找到目录。

务必：

媒体歌=新媒体（。新的文件（路径）.toURI（）的toString（））;