Question

我一直在尝试使用AudioClip播放sound1和sound2。这是我的代码：

import javax.sound.sampled.*;

public class Sound {

private Clip clip;

public static final Sound sound1 = new Sound("src/Sounds/Classic_Horror_2.wav");
public static final Sound sound2 = new Sound("src/Sounds/Classic Horror 3.mp3");

public Sound (String fileName) {
    try {
        AudioInputStream ais = AudioSystem.getAudioInputStream(Sound.class.getResource(fileName));
        clip = AudioSystem.getClip();
        clip.open(ais);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public void play() {
    try {
        if (clip != null) {
            new Thread() {
                public void run() {
                    synchronized (clip) {
                        clip.stop();
                        clip.setFramePosition(0);
                        clip.start();
                    }
                }
            }.start();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public void stop(){
    if(clip == null) return;
    clip.stop();
}

public void loop() {
    try {
        if (clip != null) {
            new Thread() {
                public void run() {
                    synchronized (clip) {
                        clip.stop();
                        clip.setFramePosition(0);
                        clip.loop(Clip.LOOP_CONTINUOUSLY);
                    }
                }
            }.start();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public boolean isActive(){
    return clip.isActive();
}
}

当我尝试做Sound.sound1.loop（）;或Sound.sound1.play（）;我得到一个空指针异常。同样适用于sound2。以下是确切的错误消息：

java.lang.NullPointerException
at com.sun.media.sound.StandardMidiFileReader.getSequence(StandardMidiFileReader.java:207)
at javax.sound.midi.MidiSystem.getSequence(MidiSystem.java:841)
at com.sun.media.sound.SoftMidiAudioFileReader.getAudioInputStream(SoftMidiAudioFileReader.java:178)
at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1147)
at Sound.<init>(Sound.java:12)
at Sound.<clinit>(Sound.java:7)
at IntroductionComponent.<init>(IntroductionComponent.java:54)
at IntroductionGUI.main(IntroductionGUI.java:9)


java.lang.NullPointerException
at com.sun.media.sound.StandardMidiFileReader.getSequence(StandardMidiFileReader.java:207)
at javax.sound.midi.MidiSystem.getSequence(MidiSystem.java:841)
at com.sun.media.sound.SoftMidiAudioFileReader.getAudioInputStream(SoftMidiAudioFileReader.java:178)
at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1147)
at Sound.<init>(Sound.java:12)
at Sound.<clinit>(Sound.java:8)
at IntroductionComponent.<init>(IntroductionComponent.java:54)
at IntroductionGUI.main(IntroductionGUI.java:9)

我一直在浏览stackoverflow以寻找可能的修复，但是可能是fileName不断返回null，或者我的URL在某种程度上是不正确的。这就是说，我知道它可能是任何东西。有关如何解决此问题的任何建议吗？

Answer 1

在您的路径中包含src ...

public static final Sound sound1 = new Sound("src/Sounds/Classic_Horror_2.wav");
public static final Sound sound2 = new Sound("src/Sounds/Classic Horror 3.mp3");

是您的关键问题，src在构建和打包应用程序后不会存在，您永远不应该引用src。

你可能应该使用更像......

的东西

public static final Sound sound1 = new Sound("/Sounds/Classic_Horror_2.wav");
public static final Sound sound2 = new Sound("/Sounds/Classic Horror 3.mp3");

public Sound (String fileName) {
    try {
        AudioInputStream ais = AudioSystem.getAudioInputStream(getClass().getResource(fileName));
        clip = AudioSystem.getClip();
        clip.open(ais);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

我个人认为Sound需要URL ...

public Sound (URL url) {
    try {
        AudioInputStream ais = AudioSystem.getAudioInputStream(url);
        clip = AudioSystem.getClip();
        clip.open(ais);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

这样就不会混淆String的含义，您可以从嵌入式资源，文件引用甚至是网络传递引用

同样从内存中，clip.start()创建了自己的主题，因此无需创建自己的主题

AudioClip尝试在JFrame上播放声音时出现问题

1 个答案: