Url AudioInputStream正在引发NullPointerException
我一直在寻找一种方法,从我的项目中导出一个JAR文件,无论声音文件位于何处,它都能始终播放声音文件。为此,我编写了以下代码,返回文件的精确路径Url AudioInputStream正在引发NullPointerException,url,audio,nullpointerexception,clip,audioinputstream,Url,Audio,Nullpointerexception,Clip,Audioinputstream,我一直在寻找一种方法,从我的项目中导出一个JAR文件,无论声音文件位于何处,它都能始终播放声音文件。为此,我编写了以下代码,返回文件的精确路径 public MouseHandler() { playSound("rsc/click.wav"); } public void playSound(final String fileName) { File file = new File(fileName); try { URL fileU
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)
file:///X:/workspace/eclipse/Minesweeper/rsc/click.wav
java.lang.NullPointerException
位于java.base/java.util.Objects.requirennull(Objects.java:222)
位于java.desktop/javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1006)
在configs.MouseHandler.playSound(MouseHandler.java:62)
[AudioInputStream inputStream=音频系统
.getAudioInputStream(MouseHandler.class.getResourceAsStream(URL));]
位于configs.MouseHandler.(MouseHandler.java:45)
[播放声音(“rsc/click.wav”);]
在configs.Button.(Button.java:57)
在gui.Frame.(Frame.java:81)
在start.Main.Main处(Main.java:13)
如果我给AudioInputStream
“rsc/click.wav”
,我知道这不会发生,但是当我导出项目时找不到该文件。如果有其他方法可以导出仍然可以播放音频文件的项目,如果可行的话,我会使用它。stackoverflow.com/tags/javasound/info的解决方案对我很有效,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();
}
此链接有两个加载内容的示例:通过远程URL,或从jar中包含的文件加载内容。