视频音频播放器：这是我编写的一个视频音频播放器，可以播放的音频有mp3，wav，视频是avi，其他格式要进行另外编码。我旨在理解...

package videopalyer2; import javax.swing.*; import java.awt.BorderLayout; import java.awt.Component; import java.awt.event.*; import java.io.*; import java.net.MalformedURLException; import java.net.URL; public class VideoPlayerFrame extends JFrame{ private JMenuItem open,exit,loop,aboutus,help; private JPanel JVideoPanel; private JLabel videoName; private boolean isLoop = false,first = true; private File currentDirctory; private URL url; public VideoPlayerFrame(){ super("我的视频"); init(); this.setSize(600,450); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setLocationRelativeTo(null); this.setVisible(true); } public void init(){ this.setJMenuBar(createBar()); JPanel contentPane = (JPanel)this.getContentPane(); JVideoPanel = new JPanel(); JVideoPanel.setLayout(new BorderLayout()); contentPane.add(JVideoPanel,BorderLayout.CENTER); videoName = new JLabel(); contentPane.add(videoName,BorderLayout.SOUTH); } public JMenuBar createBar(){ JMenuBar menu_bar = new JMenuBar(); JMenu menu_file = new JMenu("文件(F)"); menu_file.setMnemonic(KeyEvent.VK_F); open = new JMenuItem("打开(O)"); open.setAccelerator(KeyStroke.getKeyStroke('O', KeyEvent.CTRL_MASK)); open.addActionListener(new OpenListener()); exit = new JMenuItem("退出(X)..."); exit.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ System.exit(0); } }); exit.setAccelerator(KeyStroke.getKeyStroke('X', KeyEvent.CTRL_MASK)); menu_file.add(open); menu_file.add(exit); JMenu menu_play = new JMenu("播放（P）"); menu_play.setMnemonic(KeyEvent.VK_P); loop = new JCheckBoxMenuItem("循环(L)"); loop.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ isLoop = !isLoop; } }); menu_play.add(loop); JMenu menu_help = new JMenu("帮助(H)"); menu_help.setMnemonic(KeyEvent.VK_H); help = new JMenuItem("帮助"); aboutus = new JMenuItem("关于我们..."); menu_help.add(help); menu_help.add(aboutus); menu_bar.add(menu_file); menu_bar.add(menu_play); menu_bar.add(menu_help); return menu_bar; } public JPanel getJVideoPanel() { return JVideoPanel; } public void setJVisualPanel(Component com){ JVideoPanel.add(com,BorderLayout.CENTER); } public void setJControlPanel(Component com){ JVideoPanel.add(com,BorderLayout.SOUTH); } public JLabel getVideoName() { return videoName; } public boolean getLoop() { return isLoop; } class OpenListener implements ActionListener{ public void actionPerformed(ActionEvent e){ JFileChooser fileChooser = new JFileChooser(); if(!first){ fileChooser.setCurrentDirectory(currentDirctory); } first = false; int rVal = fileChooser.showOpenDialog(VideoPlayerFrame.this); if(rVal == JFileChooser.APPROVE_OPTION){ try { url = fileChooser.getSelectedFile().getAbsoluteFile().toURI().toURL(); currentDirctory = fileChooser.getCurrentDirectory(); } catch (MalformedURLException e1) { e1.printStackTrace(); } System.out.println(url); new VideoPlayer(VideoPlayerFrame.this,url); } if(rVal == JFileChooser.CANCEL_OPTION){ } } } }