import java.io.File;
import java.io.IOException;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.FloatControl;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.UnsupportedAudioFileException;

/**
 * Java实现音乐播放
 * 
 * @author xqh
 *
 */
public class MusicPlayer {
    public static void main(String[] args) {
        AudioPlayWave audioPlayWave = new AudioPlayWave("src/那又如何.wav");
        audioPlayWave.start(); // 启动线程
    }
}

/**
 * 线程控制音乐的播放
 * 
 * @author xqh
 *
 */
class AudioPlayWave extends Thread {
    private String fileName; // 播放音乐的文件名
    private Position curPosition; // 声道
    private final int EXTERNAL_BUFFER_SIZE = 524288; // 128k

    enum Position { // 声道
        LEFT, RIGHT, NORMAL
    };

    // 构造函数
    public AudioPlayWave(String wavFile) {
        this.fileName = wavFile;
        curPosition = Position.NORMAL;
    }

    public void run() {
        File soundFile = new File(fileName); // 播放音乐的文件名
        if (!soundFile.exists()) {
            System.err.println("Wave file not found:" + fileName);
            return;
        }

        AudioInputStream audioInputStream = null; // 创建音频输入流对象
        try {
            audioInputStream = AudioSystem.getAudioInputStream(soundFile); // 创建音频对象
        } catch (UnsupportedAudioFileException e1) {
            e1.printStackTrace();
            return;
        } catch (IOException e1) {
            e1.printStackTrace();
            return;
        }

        AudioFormat format = audioInputStream.getFormat(); // 音频格式
        SourceDataLine auline = null; // 源数据线
        DataLine.Info info = new DataLine.Info(SourceDataLine.class, format);

        try {
            auline = (SourceDataLine) AudioSystem.getLine(info);
            auline.open(format);
        } catch (LineUnavailableException e) {
            e.printStackTrace();
            return;
        } catch (Exception e) {
            e.printStackTrace();
            return;
        }

        if (auline.isControlSupported(FloatControl.Type.PAN)) {
            FloatControl pan = (FloatControl) auline
                    .getControl(FloatControl.Type.PAN);
            if (curPosition == Position.RIGHT)
                pan.setValue(1.0f);
            else if (curPosition == Position.LEFT)
                pan.setValue(-1.0f);
        }

        auline.start();
        int nBytesRead = 0;
        byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];

        try {
            while (nBytesRead != -1) {
                nBytesRead = audioInputStream.read(abData, 0, abData.length);
                if (nBytesRead >= 0)
                    auline.write(abData, 0, nBytesRead);
            }
        } catch (IOException e) {
            e.printStackTrace();
            return;
        } finally {
            auline.drain();
            auline.close();
        }
    }

}

------解决方案--------------------
applet 和 jmf 都可以实现