如何在Java应用程序中播放声音文件

import javax.sound.midi.*;
import javax.sound.sampled.*;
import java.io.*;

/**
*实现背景音乐的播放
*----循环20次的播放音乐
*实现声音的一次性播放
*
*Author:Shopping See
*Start Date:2007-11-3
*/ 
public class Sound {
File sound;
Sequence seq;
Sequencer midi;

public Sound(){
try {
sound=new File("res\\bgmusic.mid");
seq=MidiSystem.getSequence(sound);
midi=MidiSystem.getSequencer();
midi.open();
midi.setSequence(seq);
}
catch (Exception ex) {
}
}