java中循环播放midi

package aquar.loop.music;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Hashtable;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;
import javax.sound.midi.Sequence;
import javax.sound.midi.Sequencer;


public class LoopMusic implements Runnable{
    private Sequencer midi;
    private String[] names ={".\\sound\\1.mid",".\\sound\\2.mid",".\\sound\\3.mid",".\\sound\\4.mid",".\\sound\\5.mid"};
    private int i;//播放歌曲计数
    private Map<String, Sequence> map;
   
    public LoopMusic() {//constructor
        initMap();
        new Thread(this).start();
    }
   

    private void initMap(){//initiate the map
        try {
            map = new Hashtable<String, Sequence>();
            midi = MidiSystem.getSequencer();//only one instance of squencer.
            midi.open();//open a device for play.
            for (String s: names) {
                try {
                    Sequence s1 = MidiSystem.getSequence(new File(s));//read a midi file.
                    map.put(s, s1);//put the midi file into the map.
                } catch (InvalidMidiDataException ex) {
                    Logger.getLogger(LoopMusic.class.getName()).log(Level.SEVERE,null,ex);
                    // TODO: handle exception
                } catch (IOException ex) {
                    Logger.getLogger(LoopMusic.class.getName()).log(Level.SEVERE,null,ex);
                }               
            }
        } catch (MidiUnavailableException ex) {
            Logger.getLogger(LoopMusic.class.getName()).log(Level.SEVERE,null,ex);
            // TODO: handle exception
        }
    }
   
    private void createPlayer(String name){
        try {
            System.out.println(name);
            System.out.println(map.get(name));
            Sequence se = map.get(name);//read a midi file from the map.
            midi.setSequence(se);//set current midi file.
            midi.start();//play the midi file.
        } catch (InvalidMidiDataException ex) {
            Logger.getLogger(LoopMusic.class.getName()).log(Level.SEVERE,null,ex);
        }
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        System.out.println(System.getProperty("user.dir"));
        new LoopMusic();

    }

    @Override
    public void run() {
        while (true) {
            try {
                System.out.println("换文件了。"+(++i));
                String name = names[(int)(Math.random()*names.length)];//read a midi file randomly
                createPlayer(name);//play a midi file.
                Thread.sleep(10000);
            } catch (InterruptedException ex) {
                Logger.getLogger(LoopMusic.class.getName()).log(Level.SEVERE,null,ex);
            }
        }
       
    }

}

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