Java中未使用的异常并从地图中删除对象

Question

我用Java做过游戏。 尽管在Eclipse中可以正常工作，但是当打包到jar中时，出现了一个问题，即地图中的对象永远不会被破坏。 为了检查是否有异常，我从命令行启动了它，而java向我说明了以下异常。

C:\Users\SriHarshaCH>java -jar C:\Users\SriHarshaCH\Desktop\Treasure.jar

java.io.IOException: mark/reset not supported
        at java.util.zip.InflaterInputStream.reset(Unknown Source)
        at java.io.FilterInputStream.reset(Unknown Source)
        at com.sun.media.sound.SoftMidiAudioFileReader.getAudioInputStream(Unknown Source)
        at javax.sound.sampled.AudioSystem.getAudioInputStream(Unknown Source)
        at com.gej.sound.WavPlayer.loadSound(WavPlayer.java:39)
        at treasure.Treasure.initResources(Treasure.java:152)
        at com.gej.core.Game.run(Game.java:117)
        at java.lang.Thread.run(Unknown Source)
java.io.IOException: mark/reset not supported
        at java.util.zip.InflaterInputStream.reset(Unknown Source)
        at java.io.FilterInputStream.reset(Unknown Source)
        at com.sun.media.sound.SoftMidiAudioFileReader.getAudioInputStream(Unknown Source)
        at javax.sound.sampled.AudioSystem.getAudioInputStream(Unknown Source)
        at com.gej.sound.WavPlayer.loadSound(WavPlayer.java:39)
        at treasure.Treasure.initResources(Treasure.java:154)
        at com.gej.core.Game.run(Game.java:117)
        at java.lang.Thread.run(Unknown Source)
java.io.IOException: mark/reset not supported
        at java.util.zip.InflaterInputStream.reset(Unknown Source)
        at java.io.FilterInputStream.reset(Unknown Source)
        at com.sun.media.sound.SoftMidiAudioFileReader.getAudioInputStream(Unknown Source)
        at javax.sound.sampled.AudioSystem.getAudioInputStream(Unknown Source)
        at com.gej.sound.WavPlayer.loadSound(WavPlayer.java:39)
        at treasure.Treasure.initResources(Treasure.java:156)
        at com.gej.core.Game.run(Game.java:117)
        at java.lang.Thread.run(Unknown Source)
java.io.IOException: mark/reset not supported
        at java.util.zip.InflaterInputStream.reset(Unknown Source)
        at java.io.FilterInputStream.reset(Unknown Source)
        at com.sun.media.sound.SoftMidiAudioFileReader.getAudioInputStream(Unknown Source)
        at javax.sound.sampled.AudioSystem.getAudioInputStream(Unknown Source)
        at com.gej.sound.WavPlayer.loadSound(WavPlayer.java:39)
        at treasure.Treasure.initResources(Treasure.java:158)
        at com.gej.core.Game.run(Game.java:117)
        at java.lang.Thread.run(Unknown Source)
java.io.IOException: mark/reset not supported
        at java.util.zip.InflaterInputStream.reset(Unknown Source)
        at java.io.FilterInputStream.reset(Unknown Source)
        at com.sun.media.sound.SoftMidiAudioFileReader.getAudioInputStream(Unknown Source)
        at javax.sound.sampled.AudioSystem.getAudioInputStream(Unknown Source)
        at com.gej.sound.WavPlayer.loadSound(WavPlayer.java:39)
        at treasure.Treasure.initResources(Treasure.java:163)
        at com.gej.core.Game.run(Game.java:117)
        at java.lang.Thread.run(Unknown Source)

但是我没有使用任何zip文件，而且wav-player在游戏中也可以正常工作。 游戏仍会启动。 但是不会从地图上删除对象。 我该如何解决呢？？？

这是地图的updateobjects方法，我可以在其中更新和删除死对象。

/**
 * Updates all the objects contained in the map.
 * @param elapsedTime The time elapsed in the current frame.
 */
public static void updateObjects(long elapsedTime){
    for (int i=0; i<objects.size(); i++){
        try {
            GObject obj = objects.get(i);
            if (obj!=null){
                if (obj.isAlive()){
                    obj.superUpdate(elapsedTime);
                    obj.moveHorizontally(elapsedTime);
                    checkCollisions(obj, true, false);
                    obj.moveVertically(elapsedTime);
                    checkCollisions(obj, false, true);
                    checkCollisions(obj, false, false);
                } else {
                    // Remove the dead object
                    objects.remove(i);
                }
            } else {
                objects.remove(i);
            }
        } catch (NullPointerException e){}
    }
}

编辑：提取jar并使用代码启动游戏时，游戏效果很好

java treasure.Treasure

它什么也不会返回并且可以正常播放。

这是loadSound方法

/**
 * Loads a sound from a file in the jar file to play them
 * at any time. Supports loading of .wav, .au, .aiff files.
 * Also converts MIDI files on the fly
 * @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 {
        // Create the audio input stream and audio format
        audioStream = AudioSystem.getAudioInputStream(is);
        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);
        // 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
        e.printStackTrace();
    }
    return null;
}

现在重新创建jar文件解决了异常问题。 但是这些物体并没有被破坏。

Answer 1

发生的情况是，用于播放.wav文件的API使用mark()和reset() I / O方法。 当.wav文件是文件系统上的“真实”文件时，这很好用，但是当它在jar文件中时，系统不再可以执行mark()和reset() 。 这是将数据放入jar文件的陷阱-在运行时，无法保证jar文件位于文件系统上。 它甚至可以跨网络流传输，并且在运行它的系统上没有物理存在。

应该发生的是，您在程序启动时将.wav资源复制到系统定义的临时目录中，然后可以在其中创建“真实”文件，然后从那里开始播放它们。