播放AudioInputStream时出错

我想创建2个可以启动和停止背景音频的JMenuItem 。

这是我的代码：

 public class MainClass extends JFrame { private AudioInputStream audioInputStream; private Clip clip; public MainClass(String title) { try { audioInputStream = AudioSystem.getAudioInputStream(new File("Background.wav")); clip = AudioSystem.getClip(); clip.loop(Clip.LOOP_CONTINUOUSLY); clip.open(audioInputStream); } catch(Exception e) { System.out.println("Error with playing sound."); e.printStackTrace(); } } public void startSound() { clip3.start(); settingSubMenuItem1.setEnabled(false); settingSubMenuItem2.setEnabled(true); } public void stopSound() { clip3.stop(); settingSubMenuItem1.setEnabled(true); settingSubMenuItem2.setEnabled(false); } private class MenuItemListener implements ActionListener { public void actionPerformed(ActionEvent e) { if(e.getSource() == settingSubMenuItem1) { startSound(); } if(e.getSource() == settingSubMenuItem2) { stopSound(); } } } } 

当我单击settingSubMenuItem1 ，它工作正常，播放音频。

但是，当我单击settingSubMenuItem2 ，会出现错误，如果再次单击settingSubMenuItem1 ，则不会再发出声音。

这是错误：

 Error with playing sound. java.lang.IllegalStateException: Clip is already open with format PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian and frame lengh of 7658 

我的程序有什么错误？

Answer 1

这里的SSCCE是一个’空结果’，因为音频重启（尝试至少3次），没有例外。

 import java.net.URL; import java.awt.event.*; import javax.swing.*; import javax.sound.sampled.*; public class RestartableLoopSound { public static void main(String[] args) throws Exception { URL url = new URL( "http://pscode.org/media/leftright.wav"); final Clip clip = AudioSystem.getClip(); AudioInputStream ais = AudioSystem. getAudioInputStream( url ); clip.open(ais); SwingUtilities.invokeLater(new Runnable() { public void run() { final JToggleButton b = new JToggleButton("Loop"); ActionListener listener = new ActionListener() { public void actionPerformed(ActionEvent ae) { if (b.isSelected()) { // loop continuously clip.loop(Clip.LOOP_CONTINUOUSLY); } else { clip.stop(); } } }; b.addActionListener(listener); JOptionPane.showMessageDialog(null, b); } }); } }