Java音頻流關閉錯誤

Question

我正在嘗試向我正在製作的遊戲添加聲音，但每次嘗試加載聲音時，都會收到流關閉異常。我不明白爲什麼會發生這種情況。

加載聲音：

public class WavPlayer extends Thread { 

/* 
* @param s The path of the wav file. 
* @return The sound data loaded into the WavSound object 
*/ 
public static WavSound loadSound(String s){ 
    // Get an input stream 
    InputStream is = WavPlayer.class.getClassLoader().getResourceAsStream(s); 
    AudioInputStream audioStream; 
    try { 
     // Buffer the input stream 
     BufferedInputStream bis = new BufferedInputStream(is); 
     // Create the audio input stream and audio format 
     audioStream = AudioSystem.getAudioInputStream(bis); //!Stream Closed Exception occurs here 
     AudioFormat format = audioStream.getFormat(); 
     // The length of the audio file 
     int length = (int) (audioStream.getFrameLength() * format.getFrameSize()); 
     // The array to store the samples in 
     byte[] samples = new byte[length]; 
     // Read the samples into array to reduce disk access 
     // (fast-execution) 
     DataInputStream dis = new DataInputStream(audioStream); 
     dis.readFully(samples); 
     // Create a sound container 
     WavSound sound = new WavSound(samples, format, (int) audioStream.getFrameLength()); 
     // Don't start the sound on load 
     sound.setState(SoundState.STATE_STOPPED); 
     // Create a new player for each sound 
     new WavPlayer(sound); 
     return sound; 
    } catch (Exception e) { 
     // An error. Mustn't happen 
    } 
    return null; 
} 

// Private variables 
private WavSound sound = null; 

/** 
* Constructs a new player with a sound and with an optional looping 
* 
* @param s The WavSound object 
*/ 
public WavPlayer(WavSound s) { 
    sound = s; 
    start(); 
} 

/** 
* Runs the player in a separate thread 
*/ 
@Override 
public void run(){ 
    // Get the byte samples from the container 
    byte[] data = sound.getData(); 
    InputStream is = new ByteArrayInputStream(data); 
    try { 
     // Create a line for the required audio format 
     SourceDataLine line = null; 
     AudioFormat format = sound.getAudioFormat(); 
     // Calculate the buffer size and create the buffer 
     int bufferSize = sound.getLength(); 
     // System.out.println(bufferSize); 
     byte[] buffer = new byte[bufferSize]; 
     // Create a new data line to write the samples onto 
     DataLine.Info info = new DataLine.Info(SourceDataLine.class, format); 
     line = (SourceDataLine) AudioSystem.getLine(info); 
     // Open and start playing on the line 
     try { 
      if (!line.isOpen()) { 
       line.open(); 
      } 
      line.start(); 
     } catch (Exception e){} 
     // The total bytes read 
     int numBytesRead = 0; 
     boolean running = true; 
     while (running) { 
      // Destroy this player if the sound is destroyed 
      if (sound.getState() == SoundState.STATE_DESTROYED) { 
       running = false; 
       // Release the line and release any resources used 
       line.drain(); 
       line.close(); 
      } 
      // Write the data only if the sound is playing or looping 
      if ((sound.getState() == SoundState.STATE_PLAYING) 
        || (sound.getState() == SoundState.STATE_LOOPING)) { 
       numBytesRead = is.read(buffer, 0, buffer.length); 
       if (numBytesRead != -1) { 
        line.write(buffer, 0, numBytesRead); 
       } else { 
        // The samples are ended. So reset the position of the 
        // stream 
        is.reset(); 
        // If the sound is not looping, stop it 
        if (sound.getState() == SoundState.STATE_PLAYING) { 
         sound.setState(SoundState.STATE_STOPPED); 
        } 
       } 
      } else { 
       // Not playing. so wait for a few moments 
       Thread.sleep(Math.min(1000/Global.FRAMES_PER_SECOND, 10)); 
      } 
     } 
    } catch (Exception e) { 
     // Do nothing 
    } 
} 

該錯誤消息我得到的是：「在線程異常 「主」 產生java.io.IOException：流在java.io.BufferedInputStream.getInIfOpen關閉 （BufferedInputStream.java:134） at java.io.BufferedInputStream.fill（BufferedInputStream.java:218） at java.io.BufferedInputStream.read（BufferedInputStream.java:237） at java.io.DataInputStream.readInt（DataInputStream .java：370） at com.su n.media.sound.WaveFileReader.getFMT（WaveFileReader.java:224） at com.sun.media.sound.WaveFileReader.getAudioInputStream（WaveFileReader.java:140） at javax.sound.sampled.AudioSystem.getAudioInputStream（AudioSystem。的java：1094） 在stm.sounds.WavPlayer.loadSound（WavPlayer.java:42） 在stm.STM（STM.java:265） 在stm.STM.main（STM.java:363）」

。

Answer 1

最有可能在此行中的文件路徑是不正確的：

WavPlayer sound1 = WavPlayer.loadSound("coin.wav"); 

您應該通過「coin.wav」文件研究所的路徑只是它的名字而已。

例如，如果它在一個名爲sounds的文件夾下面，我們可以說在項目的根目錄下，那個參數應該是'sounds/coin.wav'。

Answer 2

問題出在您的靜態方法loadSound。拋出異常時，此方法返回null。你抓住它，但你什麼都不做吧，

• NEVER使空的catch。
• 捕獲特定的異常。

我會改變你的方法簽名loadSound爲

public static WavSound loadSound(String s) throws Exception // rather than exception specific exception!! 

然後你的方法，無需try-catch