我有这个代码从播放和停止的文件夹播放wav文件。如何添加暂停并继续？
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.applet.AudioClip;
import java.net.URL;
public class JukeBox extends JFrame {
private JComboBox musicCombo;
private JButton stopButton, playButton;
private AudioClip[] music;
private AudioClip current;
public JukeBox(String title) {
super(title);
getContentPane().add(new JukeBoxControls());
}
public static void main(String [] args) {
JukeBox myf = new JukeBox ("WAV COMBOBOX");
myf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myf.pack();
myf.setVisible(true);
}
private class JukeBoxControls extends JPanel {
public JukeBoxControls() {
URL url1, url2, url3, url4, url5;
url1 = url2 = url3 = url4 = url5 = null;
try
{
url1 = new URL ("file", "localhost", "beep-01a.wav");
url2 = new URL ("file", "localhost", "beep-02.wav");
url3 = new URL ("file", "localhost", "beep-03.wav");
url4 = new URL ("file", "localhost", "beep-04.wav");
url5 = new URL ("file", "localhost", "beep-05.wav");
}
catch (Exception exception) {}
music = new AudioClip[7];
music[0] = null;
music[1] = JApplet.newAudioClip (url1);
music[2] = JApplet.newAudioClip (url2);
music[3] = JApplet.newAudioClip (url3);
music[4] = JApplet.newAudioClip (url4);
music[5] = JApplet.newAudioClip (url5);
JLabel titleLabel = new JLabel ("WAV COMBOBOX");
titleLabel.setAlignmentX (Component.CENTER_ALIGNMENT);
String[] musicNames = {"vyberte...", "sound 1",
"sound 2", "sound 3", "sound 4",
"sound 5"};
musicCombo = new JComboBox (musicNames);
musicCombo.setAlignmentX (Component.CENTER_ALIGNMENT);
playButton = new JButton ("Play", new ImageIcon ("play.gif"));
playButton.setBackground (Color.white);
stopButton = new JButton ("Stop", new ImageIcon ("stop.png"));
stopButton.setBackground (Color.white);
JPanel buttons = new JPanel();
buttons.setLayout (new BoxLayout (buttons, BoxLayout.X_AXIS));
buttons.add (playButton);
buttons.add (Box.createRigidArea (new Dimension(5,0)));
buttons.add (stopButton);
setPreferredSize (new Dimension (350, 200));
setLayout (new BoxLayout (this, BoxLayout.Y_AXIS));
add (Box.createRigidArea (new Dimension(0,5)));
add (titleLabel);
add (Box.createRigidArea (new Dimension(0,5)));
add (musicCombo);
add (Box.createRigidArea (new Dimension(0,5)));
add (buttons);
add (Box.createRigidArea (new Dimension(0,5)));
musicCombo.addActionListener (new ComboListener());
stopButton.addActionListener (new ButtonListener());
playButton.addActionListener (new ButtonListener());
current = null;
}
}
private class ComboListener implements ActionListener {
public void actionPerformed (ActionEvent event)
{
if (current != null)
current.stop();
current = music[musicCombo.getSelectedIndex()];
}
}
private class ButtonListener implements ActionListener {
public void actionPerformed (ActionEvent event)
{
if (current != null)
current.stop();
if (event.getSource() == playButton)
if (current != null)
current.play();
}
}
}
答案 0 :(得分：3)
如果您使用javax.sound.sampled.Clip和支持API而不是java.applet.AudioClip，您将获得对音频剪辑的更多控制权，例如......
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineEvent;
import javax.sound.sampled.LineEvent.Type;
import javax.sound.sampled.LineListener;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class SimplyPlayer {
public static void main(String[] args) {
new SimplyPlayer();
}
public SimplyPlayer() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private Clip clip;
private JTextField audioFile;
private JButton play;
private JButton stop;
private int lastFrame;
public TestPane() {
setLayout(new GridBagLayout());
audioFile = new JTextField(20);
play = new JButton(">");
stop = new JButton("[]");
JPanel controls = new JPanel();
controls.add(play);
controls.add(stop);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
add(audioFile, gbc);
gbc.gridy++;
add(controls, gbc);
play.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (clip == null) {
try {
loadClip(new File(audioFile.getText()));
clip.start();
clip.addLineListener(new LineListener() {
@Override
public void update(LineEvent event) {
if (event.getType().equals(Type.START)) {
play.setText("||");
} else if (event.getType().equals(Type.OPEN)) {
System.out.println("Open");
} else if (event.getType().equals(Type.STOP)) {
play.setText(">");
} else if (event.getType().equals(Type.CLOSE)) {
play.setText(">");
}
}
});
play.setText("||");
} catch (LineUnavailableException | IOException | UnsupportedAudioFileException ex) {
ex.printStackTrace();
JOptionPane.showMessageDialog(TestPane.this, "Failed to load audio clip", "Error", JOptionPane.ERROR_MESSAGE);
}
} else {
if (clip.isRunning()) {
lastFrame = clip.getFramePosition();
clip.stop();
} else {
if (lastFrame < clip.getFrameLength()) {
clip.setFramePosition(lastFrame);
} else {
clip.setFramePosition(0);
}
clip.start();
}
}
}
});
stop.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (clip != null) {
lastFrame = 0;
clip.stop();
}
}
});
}
protected void loadClip(File audioFile) throws LineUnavailableException, IOException, UnsupportedAudioFileException {
AudioInputStream audioStream = AudioSystem.getAudioInputStream(audioFile);
AudioFormat format = audioStream.getFormat();
DataLine.Info info = new DataLine.Info(Clip.class, format);
this.clip = (Clip) AudioSystem.getLine(info);
this.clip.open(audioStream);
}
}
}
基本上，在播放并按“暂停”按钮时，ActionListener会获取当前播放帧并停止剪辑，当您点击play按钮ActionListener时会设置剪辑到当前帧并恢复播放
答案 1 :(得分：0)
我认为我有一个不使用内部类的简单解决方案。您只能通过行代码创建剪辑。我使用了JAVA 1.6，以便更多人可以使用该代码。
以下是我的课程：
MainClass：
import java.awt.EventQueue;
public class MainClass {
public static void main(String[] _args) {
EventQueue.invokeLater(new LaunchingWindow());
}
}
启动窗口：
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.UIManager;
public class LaunchingWindow extends Thread {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception _0) {
}
JFrame frame_ = new JFrame("Testing");
frame_.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame_.setLayout(new BorderLayout());
frame_.add(new MusicContainer());
frame_.pack();
frame_.setLocationRelativeTo(null);
frame_.setVisible(true);
}
}
MusicContainer：
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.io.File;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class MusicContainer extends JPanel {
private Clip clip;
private JTextField audioFile;
private JButton play;
private JButton stop;
private int lastFrame;
public MusicContainer() {
setLayout(new GridBagLayout());
audioFile = new JTextField(20);
play = new JButton(">");
stop = new JButton("[]");
JPanel controls_ = new JPanel();
controls_.add(play);
controls_.add(stop);
GridBagConstraints gbc_ = new GridBagConstraints();
gbc_.gridx = 0;
gbc_.gridy = 0;
gbc_.weightx = 1;
gbc_.fill = GridBagConstraints.HORIZONTAL;
add(audioFile, gbc_);
gbc_.gridy++;
add(controls_, gbc_);
play.addActionListener(new PlayingMusic(this));
stop.addActionListener(new StoppingMusic(this));
}
public void playMusic() {
if (clip == null) {
try {
loadClip(new File(audioFile.getText()));
clip.start();
clip.addLineListener(new MusicListener(play));
play.setText("||");
} catch (Exception _0) {
_0.printStackTrace();
JOptionPane.showMessageDialog(this, "Failed to load audio clip", "Error", JOptionPane.ERROR_MESSAGE);
}
} else {
if (clip.isRunning()) {
lastFrame = clip.getFramePosition();
clip.stop();
} else {
if (lastFrame < clip.getFrameLength()) {
clip.setFramePosition(lastFrame);
} else {
clip.setFramePosition(0);
}
clip.start();
}
}
}
public void stopMusic() {
if (clip != null) {
lastFrame = 0;
clip.stop();
}
}
protected void loadClip(File _audioFile) throws Exception {
AudioInputStream audioStream_ = AudioSystem.getAudioInputStream(_audioFile);
//AudioSystem.getClip() is much easier
clip = AudioSystem.getClip();
clip.open(audioStream_);
}
}
MusicListener：
import javax.sound.sampled.LineEvent;
import javax.sound.sampled.LineListener;
import javax.swing.JButton;
public class MusicListener implements LineListener {
private static final String START = "START";
private static final String OPEN = "OPEN";
private static final String STOP = "STOP";
private static final String CLOSE = "CLOSE";
private JButton play;
public MusicListener(JButton _play) {
play = _play;
}
@Override
public void update(LineEvent _event) {
String eventType_ = _event.getType().toString();
if (eventType_.equalsIgnoreCase(START)) {
play.setText("||");
} else if (eventType_.equalsIgnoreCase(OPEN)) {
System.out.println("Open");
} else if (eventType_.equalsIgnoreCase(STOP)) {
System.out.println("close");
play.setText(">");
} else if (eventType_.equalsIgnoreCase(CLOSE)) {
play.setText(">");
}
}
}
播放音乐：
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class PlayingMusic implements ActionListener {
private MusicContainer container;
public PlayingMusic(MusicContainer _container) {
container = _container;
}
@Override
public void actionPerformed(ActionEvent _e) {
container.playMusic();
}
}
StoppingMusic：
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class StoppingMusic implements ActionListener {
private MusicContainer container;
public StoppingMusic(MusicContainer _container) {
container = _container;
}
@Override
public void actionPerformed(ActionEvent _e) {
container.stopMusic();
}
}