如何解决AudioInputStream 抛出 NullPointerException
我一直在寻找一种从我的项目中导出 JAR 文件的方法,无论它位于何处,它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 作为流打开文件时,它会抛出 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"
不会发生这种情况,但是当我导出项目时找不到该文件。如果有另一种方法可以导出仍然可以播放音频文件的项目,如果可行,我想使用它。
解决方法
stackoverflow.com/tags/javasound/info 的解决方案对我有用,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,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,bytesRead);
}
sourceDataLine.drain();
sourceDataLine.stop();
} catch (Exception e) {
System.err.println(e.getMessage());
}
}
}).start();
}
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