如何用RMS访问txt文件里的记录

import javax.microedition.media.*;import java.io.*;class SoundEffects{    private static SoundEffects instance;    private Player cityPlayer;    private Player springPlayer;    private Player flowerPlayer;    private SoundEffects()    {                   }    static SoundEffects getInstance()    {        if (instance == null)        {            instance = new SoundEffects();        }        return instance;    }    public void playCityMusic()    {          springPlayer = null;          flowerPlayer = null;          cityPlayer = createPlayer("/city.mid", "audio/midi");        startPlayer(cityPlayer);    }    public void playSpringMusic()    {          cityPlayer = null;          flowerPlayer = null;          springPlayer = createPlayer("/spring.mid", "audio/midi");        startPlayer(springPlayer);    }       public void playFlowerMusic()    {          cityPlayer = null;          springPlayer = null;          flowerPlayer = createPlayer("/flower.mid", "audio/midi");        startPlayer(flowerPlayer);    }    public void stopMusic()    {        try{          if(cityPlayer!= null)cityPlayer.stop();          if(springPlayer!= null)springPlayer.stop();          if(flowerPlayer!= null)flowerPlayer.stop();          cityPlayer = null;          springPlayer = null;          flowerPlayer = null;        }catch(IllegalStateException ise){}        catch(MediaException me){}    }        private void startPlayer(Player p)    {        if (p != null)        {            try            {                p.stop();                p.setMediaTime(0L);                p.setLoopCount(-1);                p.start();            }            catch (MediaException me)            {                // ignore            }        }    }    private Player createPlayer(String filename, String format)    {        Player p = null;        try        {            InputStream is = getClass().getResourceAsStream(filename);                      p = Manager.createPlayer(is, format);            p.prefetch();        }        catch (IOException ioe)        {            // ignore        }        catch (MediaException me)        {            // ignore        }        return p;    }}