Question

我正在尝试为我正在制作的游戏添加声音，但每次我尝试加载声音时，都会收到Stream Closed Exception。我不明白为什么会这样。

加载声音：

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
    }
}

我收到的错误消息是：“线程中的异常”main“java.io.IOException：Stream关闭在java.io.BufferedInputStream.getInIfOpen（BufferedInputStream.java:134）在java.io.BufferedInputStream.fill（BufferedInputStream.java:218）在java.io.BufferedInputStream.read（BufferedInputStream.java:237）在java.io.DataInputStream.readInt（DataInputStream.java:370）在com.sun.media.sound.WaveFileReader.getFMT（WaveFileReader.java:224） at com.sun.media.sound.WaveFileReader.getAudioInputStream（WaveFileReader.java:140）在javax.sound.sampled.AudioSystem.getAudioInputStream（AudioSystem.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

此行中的文件路径很可能不正确：

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

您应该传递'coin.wav'文件的路径，而不仅仅是其名称。

例如，如果它位于名为sounds的文件夹下，在项目的根目录下，该参数应为' sounds / coin.wav '。

Answer 2

问题在于您的静态方法loadSound。抛出异常时，此方法返回null。你抓住它但你什么都不做，

永远制作空捕获。
抓住特定的例外情况。

我会将您的方法签名loadSound更改为

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

然后是没有try-catch

的方法

Java音频流已关闭错误

2 个答案: