打開音頻時出現NullPointerException

Question

我試圖打開音頻文件，但它不起作用。 我不知道這是操作系統還是其他的東西，但是當我在Windows上時，我沒有這個問題。 我得到一個NullPointerException這裏是錯誤; 我嘗試了一個applet，bufferedInputStream，FileStream，AudioInputStream。 沒有用。 我在Linux上。

Exception in thread "main" java.lang.NullPointerException 
    at com.sun.media.sound.SoftMidiAudioFileReader.getAudioInputStream(SoftMidiAudioFileReader.java:130) 
    at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1111) 
    at com.base.engine.core.Audio.initAudio(Audio.java:29) 
    at com.base.engine.core.Audio.<init>(Audio.java:18) 
    at com.base.engine.game.Game.init(Game.java:43) 
    at com.base.engine.core.Starter.init(Starter.java:19) 
    at com.base.engine.core.Starter.run(Starter.java:43) 
    at com.base.engine.core.Starter.start(Starter.java:27) 
    at com.base.engine.game.Main.main(Main.java:11) 

代碼

package com.base.engine.core; 


    import java.io.IOException; 

    import javax.sound.sampled.AudioInputStream; 
    import javax.sound.sampled.AudioSystem; 
    import javax.sound.sampled.Clip; 
    import javax.sound.sampled.LineUnavailableException; 
    import javax.sound.sampled.UnsupportedAudioFileException; 

    public class Audio { 

     private Clip clip; 
     private int fPos = 0; 

     public Audio(String filename){ 
      initAudio(filename); 
     } 

     private void initAudio(String filename){ 
      try { 
       clip = AudioSystem.getClip(); 
      } catch (LineUnavailableException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
       try { 
        AudioInputStream stream = AudioSystem.getAudioInputStream(Audio.class.getResourceAsStream("res/sounds/"+filename)); 
        clip.open(stream); 
       } catch (UnsupportedAudioFileException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } catch (LineUnavailableException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 

     } 

     public void play(){ 
      clip.setFramePosition(0); 
      clip.start(); 
      fPos = clip.getFramePosition(); 
     } 

     public void playAt(int pos){ 
      clip.setFramePosition(pos); 
      clip.start(); 
      fPos = clip.getFramePosition(); 
     } 

     public void continuePlay(){ 
      clip.setFramePosition(fPos); 
      clip.start(); 
      fPos = clip.getFramePosition(); 
     } 

     public void stop(){ 
      fPos = clip.getFramePosition(); 
      clip.stop(); 
     } 




    } 

Answer 1

試試這個。如果File存在，那麼只能走得更遠。

File f = new File("D:\\folder\\file.mp3"); 
System.out.print(f.exists());