尝试在JFrame上播放声音时出现AudioClip问题

问题描述

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

I've been trying to play sound1 and sound2 using AudioClips. This is my code:

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();
}
}

当我尝试执行Sound.sound1.loop();时或Sound.sound1.play();我得到一个空指针异常.声音2也是如此.以下是确切的错误消息:

When I try to do Sound.sound1.loop(); or Sound.sound1.play(); I get a null pointer exception. Same goes for sound2. Here are the exact errors messages:

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)

我已经反复浏览过stackoverflow以查找可能的修复程序，但是可能fileName始终返回null，或者我的URL某种程度上不正确.就是说，就我所知，这可能是任何事情.有关如何解决此问题的任何建议?

I have repeatedly browsed stackoverflow to look for possible fixes, however it may be that fileName returns null constantly, or that my URL's are somehow incorrect. That said, for all I know it could be anything. Any suggestions on how to fix this?

推荐答案

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，一旦构建并打包了应用程序，src就不存在了，永远不要引用src.

is your key problem, src won't exist once the application is build and package, you should never refer to src ever.

您可能应该使用更多类似的东西...

You should probably be using something more like...

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();
    }
}

我个人会要求Sound需要一个URL ...

Personally, I'd make Sound require a URL...

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

这样，String的含义就不会引起混淆，您可以从嵌入式资源，文件引用甚至从网络传递引用.

This way there's no confusion over what String means and you can pass a reference from embedded resources, file references or even from the net

同样从内存中，clip.start()创建它自己的线程，因此无需创建自己的线程

Also from memory, clip.start() creates it's own thread, so there's no need to create your own

这篇关于尝试在JFrame上播放声音时出现AudioClip问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！