用Java写了一个五子棋游戏，插入背景音乐出了问题。求大神指教

用Java写了一个五子棋游戏，插入背景音乐。第一遍音乐结束就不放了，不能暂停，重新播放和循环播放等功能。我编译的时候用的是Java应用程序，不是APPlet。
package cn.edu.ouc.fiveChess;

import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.SourceDataLine;

import java.io.File;

public class sound {
public static boolean openorclose=false;
public void setopenorclose(boolean a){
this.openorclose=a;
}
public static void play(String fileurl) {

     try {            
           AudioInputStream ais = AudioSystem.getAudioInputStream(new File(fileurl));        
           AudioFormat aif = ais.getFormat();System.out.println(aif);          
           final SourceDataLine sdl;        
           DataLine.Info info = new DataLine.Info(SourceDataLine.class, aif);  
           sdl = (SourceDataLine) AudioSystem.getLine(info);      
           sdl.open(aif);      
           sdl.start();    

           if(openorclose==true){ 
               sdl.stop();   }
           int nByte = 0;      int writeByte = 0;    final int SIZE=1024*64;      byte[] buffer = new byte[SIZE];       
           while (nByte != -1) {        
          nByte = ais.read(buffer, 0, SIZE);         
               sdl.write(buffer, 0, nByte);      
               }          
           sdl.stop();   
           } 
       catch (Exception e) {   
                e.printStackTrace();    
           }    
       } 

}