java swing 完整音乐播放器

以下是一个简单的 Java Swing 音乐播放器的示例代码：

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

import javazoom.jlgui.basicplayer.BasicPlayer;
import javazoom.jlgui.basicplayer.BasicPlayerException;

public class MusicPlayer extends JFrame {

    private JPanel contentPane;
    private JLabel lblSongName;
    private JButton btnPlay;
    private JButton btnPause;
    private JButton btnStop;
    private JFileChooser fileChooser;
    private BasicPlayer player;
    private File currentFile;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    MusicPlayer frame = new MusicPlayer();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public MusicPlayer() {
        setTitle("Music Player");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 300, 150);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(new BorderLayout(0, 0));

        lblSongName = new JLabel("No song selected");
        lblSongName.setHorizontalAlignment(SwingConstants.CENTER);
        contentPane.add(lblSongName, BorderLayout.NORTH);

        JPanel buttonPane = new JPanel();
        contentPane.add(buttonPane, BorderLayout.CENTER);

        btnPlay = new JButton("Play");
        btnPlay.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                playSong();
            }
        });
        buttonPane.add(btnPlay);

        btnPause = new JButton("Pause");
        btnPause.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                pauseSong();
            }
        });
        buttonPane.add(btnPause);

        btnStop = new JButton("Stop");
        btnStop.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                stopSong();
            }
        });
        buttonPane.add(btnStop);

        fileChooser = new JFileChooser();
        fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);

        player = new BasicPlayer();
    }

    private void playSong() {
        int result = fileChooser.showOpenDialog(this);
        if (result == JFileChooser.APPROVE_OPTION) {
            currentFile = fileChooser.getSelectedFile();
            lblSongName.setText(currentFile.getName());

            try {
                player.open(currentFile);
                player.play();
            } catch (BasicPlayerException e) {
                e.printStackTrace();
            }
        }
    }

    private void pauseSong() {
        try {
            player.pause();
        } catch (BasicPlayerException e) {
            e.printStackTrace();
        }
    }

    private void stopSong() {
        try {
            player.stop();
            player.close();
            lblSongName.setText("No song selected");
        } catch (BasicPlayerException e) {
            e.printStackTrace();
        }
    }

}

这个示例使用了 `javax.swing` 和 `javazoom.jlgui.basicplayer` 库。基本的播放器控件是 `JLabel` 和三个 `JButton`，分别用于选择和播放音乐，暂停和继续播放音乐，以及停止播放音乐。播放器使用 `BasicPlayer` 类来实现音乐播放。