AudioInputStream正在引发NullPointerException

Question

我一直在寻找一种方法，从我的项目中导出一个JAR文件，无论它位于哪里，都能始终播放声音文件。为此，我编写了以下代码，返回文件的确切路径。

public MouseHandler() {
playSound("rsc/click.wav");
}
public void playSound(final String fileName) {
File file = new File(fileName);
try {
URL fileUrl = file.toURI().toURL();
String urls = fileUrl.toString();
urls = urls.replaceFirst("file:/", "file:///");
System.out.println(urls);
Clip clip = AudioSystem.getClip();
AudioInputStream inputStream = AudioSystem
.getAudioInputStream(MouseHandler.class.getResourceAsStream(urls));
clip.open(inputStream);
clip.start();
} catch (Exception e) {
e.printStackTrace();
}
}

当我让AudioInputStream以流的形式打开文件时，它会抛出一个NullPointerException，即使URL之前有一个值。

file:///X:/workspace/eclipse/Minesweeper/rsc/click.wav
java.lang.NullPointerException
at java.base/java.util.Objects.requireNonNull(Objects.java:222)
at java.desktop/javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1006)
at configs.MouseHandler.playSound(MouseHandler.java:62)
[AudioInputStream inputStream = AudioSystem
.getAudioInputStream(MouseHandler.class.getResourceAsStream(urls));]
at configs.MouseHandler.<init>(MouseHandler.java:45)
[playSound("rsc/click.wav");]
at configs.Button.<init>(Button.java:57)
at gui.Frame.<init>(Frame.java:81)
at start.Main.main(Main.java:13)

我知道如果我给AudioInputStream"rsc/click.wav"，但在导出项目时找不到该文件，则不会发生这种情况。如果有另一种方法可以导出一个仍然可以播放音频文件的项目，如果它有效的话，我想使用它。

Answer 1

stackoverflow.com/tags/javasound/info的解决方案对我很有用，非常感谢！

public void playSound(final URL fileName) throws Exception {
new Thread(new Runnable() {
public void run() {
try {
AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(fileName);
AudioFormat audioFormat = new AudioFormat(Encoding.PCM_SIGNED, 44100, 16, 2, 4, 44100, false);
Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
SourceDataLine sourceDataLine = (SourceDataLine) AudioSystem.getLine(info);
sourceDataLine.open(audioFormat);
int bytesRead = 0;
byte[] buffer = new byte[1024];
sourceDataLine.start();
while ((bytesRead = audioInputStream.read(buffer)) != -1) {
sourceDataLine.write(buffer, 0, bytesRead);
}
sourceDataLine.drain();
sourceDataLine.stop();
} catch (Exception e) {
System.err.println(e.getMessage());
}
}
}).start();
}