Java 带声音类的NullPointerException

我目前正在构建一个游戏引擎，引擎内部有一个类，名为Sound.java。本课程的目的是将声音效果加载到引擎中并播放它们。 问题是在Sound.java的构造函数中，它抛出了一个名为NullPointerException的异常；但是，这没有任何意义，因为我引用的是所述声音文件的正确文件路径

看看下面的代码+堆栈跟踪，请帮我解决这个问题

Sound.java：

public class Sound {
private Clip clip; 

public Sound(String filePath) { 
    try {
        System.out.println(filePath);
        AudioInputStream ais = AudioSystem.getAudioInputStream(getClass().getResourceAsStream(filePath));
        AudioFormat baseFormat = ais.getFormat();
        AudioFormat decodeFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, baseFormat.getSampleRate(), 16, baseFormat.getChannels(), baseFormat.getChannels() * 2, baseFormat.getSampleRate(), false);
        AudioInputStream dais = AudioSystem.getAudioInputStream(decodeFormat, ais);
        clip = AudioSystem.getClip();
        clip.open(dais);
    }
    catch(Exception e) {
        e.printStackTrace();
        CEDebug.showDebugMessage("Sound File Not Found");
    }
}

public class CESound {

private static Map<String, Sound> soundMap = new HashMap<String, Sound>(); //Sound Effects HashMap

/**
 * Adds a new sound into the hash map<br>
 * The file must be <strong>.wav</strong> format
 * @param key the key or ID that will be used to access this sound effect
 * @param fileName the name of the sound file
 */
public static void addSound(String key, String fileName) {
    try {
        soundMap.put(key, new Sound(ReferenceLibrary.SoundLocation + fileName)); //Error: (3/4/15) Sound File Not Found!
    } catch (Exception e) {
        e.printStackTrace();
        CEDebug.showDebugMessage("Sound File Not Found");
    }
}

public class ReferenceLibrary {
   public static final String ResourceLocation = "./Resources/";
   public static final String SoundLocation = ResourceLocation + "Audio/Sound/";
}

java.lang.NullPointerException
at com.sun.media.sound.SoftMidiAudioFileReader.getAudioInputStream(SoftMidiAudioFileReader.java:130)
at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1113)
at CoreEngine.ResourceLibrary.Other.Sound.<init>(Sound.java:16)
at CoreEngine.ResourceLibrary.CESound.addSound(CESound.java:21)
at ResourceLibrary.ResourceLoader.loadSounds(ResourceLoader.java:48)
at GameStates.MenuState.init(MenuState.java:25)
at GameStates.MenuState.<init>(MenuState.java:21)
at GameStates.GameStateManager.loadState(GameStateManager.java:27)
at GameStates.GameStateManager.<init>(GameStateManager.java:22)
at GameEngine.Core.init(Core.java:29)
at CoreEngine.GameEngine.CoreEngine.<init>(CoreEngine.java:55)
at GameEngine.Core.<init>(Core.java:24)
at GameEngine.Core.main(Core.java:62)

CESound.java：

public class Sound {
private Clip clip; 

public Sound(String filePath) { 
    try {
        System.out.println(filePath);
        AudioInputStream ais = AudioSystem.getAudioInputStream(getClass().getResourceAsStream(filePath));
        AudioFormat baseFormat = ais.getFormat();
        AudioFormat decodeFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, baseFormat.getSampleRate(), 16, baseFormat.getChannels(), baseFormat.getChannels() * 2, baseFormat.getSampleRate(), false);
        AudioInputStream dais = AudioSystem.getAudioInputStream(decodeFormat, ais);
        clip = AudioSystem.getClip();
        clip.open(dais);
    }
    catch(Exception e) {
        e.printStackTrace();
        CEDebug.showDebugMessage("Sound File Not Found");
    }
}

public class CESound {

private static Map<String, Sound> soundMap = new HashMap<String, Sound>(); //Sound Effects HashMap

/**
 * Adds a new sound into the hash map<br>
 * The file must be <strong>.wav</strong> format
 * @param key the key or ID that will be used to access this sound effect
 * @param fileName the name of the sound file
 */
public static void addSound(String key, String fileName) {
    try {
        soundMap.put(key, new Sound(ReferenceLibrary.SoundLocation + fileName)); //Error: (3/4/15) Sound File Not Found!
    } catch (Exception e) {
        e.printStackTrace();
        CEDebug.showDebugMessage("Sound File Not Found");
    }
}

public class ReferenceLibrary {
   public static final String ResourceLocation = "./Resources/";
   public static final String SoundLocation = ResourceLocation + "Audio/Sound/";
}

java.lang.NullPointerException
at com.sun.media.sound.SoftMidiAudioFileReader.getAudioInputStream(SoftMidiAudioFileReader.java:130)
at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1113)
at CoreEngine.ResourceLibrary.Other.Sound.<init>(Sound.java:16)
at CoreEngine.ResourceLibrary.CESound.addSound(CESound.java:21)
at ResourceLibrary.ResourceLoader.loadSounds(ResourceLoader.java:48)
at GameStates.MenuState.init(MenuState.java:25)
at GameStates.MenuState.<init>(MenuState.java:21)
at GameStates.GameStateManager.loadState(GameStateManager.java:27)
at GameStates.GameStateManager.<init>(GameStateManager.java:22)
at GameEngine.Core.init(Core.java:29)
at CoreEngine.GameEngine.CoreEngine.<init>(CoreEngine.java:55)
at GameEngine.Core.<init>(Core.java:24)
at GameEngine.Core.main(Core.java:62)

堆栈跟踪：

public class Sound {
private Clip clip; 

public Sound(String filePath) { 
    try {
        System.out.println(filePath);
        AudioInputStream ais = AudioSystem.getAudioInputStream(getClass().getResourceAsStream(filePath));
        AudioFormat baseFormat = ais.getFormat();
        AudioFormat decodeFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, baseFormat.getSampleRate(), 16, baseFormat.getChannels(), baseFormat.getChannels() * 2, baseFormat.getSampleRate(), false);
        AudioInputStream dais = AudioSystem.getAudioInputStream(decodeFormat, ais);
        clip = AudioSystem.getClip();
        clip.open(dais);
    }
    catch(Exception e) {
        e.printStackTrace();
        CEDebug.showDebugMessage("Sound File Not Found");
    }
}

public class CESound {

private static Map<String, Sound> soundMap = new HashMap<String, Sound>(); //Sound Effects HashMap

/**
 * Adds a new sound into the hash map<br>
 * The file must be <strong>.wav</strong> format
 * @param key the key or ID that will be used to access this sound effect
 * @param fileName the name of the sound file
 */
public static void addSound(String key, String fileName) {
    try {
        soundMap.put(key, new Sound(ReferenceLibrary.SoundLocation + fileName)); //Error: (3/4/15) Sound File Not Found!
    } catch (Exception e) {
        e.printStackTrace();
        CEDebug.showDebugMessage("Sound File Not Found");
    }
}

public class ReferenceLibrary {
   public static final String ResourceLocation = "./Resources/";
   public static final String SoundLocation = ResourceLocation + "Audio/Sound/";
}

java.lang.NullPointerException
at com.sun.media.sound.SoftMidiAudioFileReader.getAudioInputStream(SoftMidiAudioFileReader.java:130)
at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1113)
at CoreEngine.ResourceLibrary.Other.Sound.<init>(Sound.java:16)
at CoreEngine.ResourceLibrary.CESound.addSound(CESound.java:21)
at ResourceLibrary.ResourceLoader.loadSounds(ResourceLoader.java:48)
at GameStates.MenuState.init(MenuState.java:25)
at GameStates.MenuState.<init>(MenuState.java:21)
at GameStates.GameStateManager.loadState(GameStateManager.java:27)
at GameStates.GameStateManager.<init>(GameStateManager.java:22)
at GameEngine.Core.init(Core.java:29)
at CoreEngine.GameEngine.CoreEngine.<init>(CoreEngine.java:55)
at GameEngine.Core.<init>(Core.java:24)
at GameEngine.Core.main(Core.java:62)

java.lang.NullPointerException
在com.sun.media.sound.softmidiaAudioFileReader.getAudioInputStream（softmidiaAudioFileReader.java:130）上
位于javax.sound.sampled.AudioSystem.getAudioInputStream（AudioSystem.java:1113）
位于CoreEngine.resourcebrary.Other.Sound.（Sound.java:16）
位于CoreEngine.resourcebrary.CESound.addSound（CESound.java:21）
位于ResourceLibrary.ResourceLoader.loadSounds（ResourceLoader.java:48）
在GameStates.MenuState.init（MenuState.java:25）
在gamestate.MenuState.（MenuState.java:21）
在GameStateManager.loadState（GameStateManager.java:27）
在GameStateManager.GameStateManager.（GameStateManager.java:22）
位于GameEngine.Core.init（Core.java:29）
在CoreEngine.GameEngine.CoreEngine.（CoreEngine.java:55）
在GameEngine.Core.（Core.java:24）
位于GameEngine.Core.main（Core.java:62）

谢谢

Nick

< P>（1）考虑使用TyySoad（GITHUB）。免费，易于使用，相当小，基本的图书馆

（2） 我建议使用这种方式（从javax.sound.sampled）来获取声音数据：

或者使用表单

AudioSystem.getAudioInputStream(File)

---

为此，首先定义URL或文件。增加的好处是，在创建AudioInputStream之前，调试/验证您是否确实与该文件联系会更容易。

看起来像

（ReferenceLibrary.SoundLocation+fileName）

有一些问题，这意味着AudioSystem.getAudioInputStream未正确创建实例。您确定此行没有给出任何异常

AudioFormat baseFormat=ais.getFormat（）错误消息引用的代码行是什么？为什么要引用com.sun.media.sound.softmidiaAudioFileReader.getAudioInputStream？您需要的一切都应该来自java.sound.sampled库。我认为sun.media.sound的东西已经被弃用了。