利用JMF实现简单的音频播放器（展示歌词）

第一个类：主要实现对音乐的播放及停止

public class PlayMusic {  
	public static Player playMusic(String MusicPath){ 
		javax.media.Player player = null;
	    try {  	    	
	        if(null==player){  
	        	File musicFile = new File(MusicPath);
	            if(musicFile.exists()){  
	                MediaLocator  locator=new MediaLocator("file:"+musicFile.getAbsolutePath());  
	                player = Manager.createRealizedPlayer(locator);  
	                player.prefetch();// 预读文件  
	            }else{  
	                System.err.println(musicFile+"  找不到");  
	            }  
	        }
	        player.start();//播放  
	    } catch (CannotRealizeException ex) {  
	        ex.printStackTrace();  
	    } catch (NoPlayerException ex) {  
	        ex.printStackTrace();  
	    } catch (IOException ex) {  
	        ex.printStackTrace();  
	    }   
	    return player;
	}   
	
	public static void stopMusic(Player player){  
		try{
			player.stop();
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}

第二个类：主要实现界面的展示以及对事件的监听

public class PlayerFrame extends JFrame{
//对JMenuBar的初始化	
	private void jmenubarSet(){
		jmb = new JMenuBar();
	}
//对JMenu的初始化	
	private void jmenuSet(){
		jm = new JMenu("文件");
		jmb.add(jm);
	}
//对JMenuItem的初始化
	private void jmenuitemSet(){
		jmi_open = new JMenuItem("打开");
		jmi_stop = new JMenuItem("停止");
		jm.add(jmi_open);
		jm.add(jmi_stop);
	}
//对JList的初始化
	private void jlistSet(){
		jl = new JList();
	}
//对JTextArea的初始化
	private void jtextSet(){
		jta = new JTextArea();
	}
//对JPanel及JscrollPane的初始化	
	private void panelSet(){
		jspl = new JScrollPane(jl);
		jspr = new JScrollPane(jta);
		jspl.setPreferredSize(new Dimension(200,450));
		jspr.setPreferredSize(new Dimension(200,450));
	}
//设置窗体居中	
	private void setCenter(JFrame jf){
		Toolkit tk =Toolkit.getDefaultToolkit();
		Dimension dm = tk.getScreenSize();
		jf.setLocation(dm.width/2-jf.getWidth()/2, dm.height/2-jf.getHeight()/2);
	}
//得到歌曲对应的歌词路径	
    private static String getLrcName(String path){
	    String lrcFileName = path.substring(0,path.lastIndexOf(".")+1);
        lrcFileName = lrcFileName + "lrc";
	    return lrcFileName;
    }
//在JTextArea区域显示歌词
    private static void getLrcContxt(String str_filePath,JTextArea ja) throws Exception{
		BufferedReader bufferedReader = new BufferedReader(new FileReader(str_filePath));  
        String str_line; 
		ja.setText("");
        while((str_line=bufferedReader.readLine())!=null){  
            if(flag_contxt){  
                ja.setText(str_line);  
                flag_contxt = false;  
            }  
            else{  
                ja.setText(ja.getText()+"\n"+str_line);  
            }  
        }  
        bufferedReader.close();  
	   }
//构造函数	
	private PlayerFrame(){
		jmenubarSet();
		jmenuSet();
		jmenuitemSet();
		jlistSet();
		jtextSet();
		panelSet();
		setLayout(new BorderLayout());
		add(jmb,BorderLayout.NORTH);
		add(jspl,BorderLayout.WEST);
		add(jspr,BorderLayout.EAST);
		setResizable(false);
		setTitle("Player");
		setVisible(true);
		setSize(500,600);
		setCenter(this);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
//JMenuItem的监听		
		jmi_open.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				//如果存在播放的歌曲，停止播放
				if(tempPlayer!=null)
					PlayMusic.stopMusic(tempPlayer);
				JFrame jf = new JFrame();
				FileDialog fd = new FileDialog(jf,"选择歌曲",FileDialog.LOAD);
				fd.setVisible(true);
				path = fd.getDirectory()+fd.getFile();
				boolean flag = false;
                if (path.equals("")) {
                    return;
                 } else if (path.equals("nullnull")) {
                    return;
                 }
				//如果JList中存在要添加的路径，则不继续在JList添加
				for(int i=0;i<list.size();i++){
					if(list.get(i).toString().equals(path)){
						flag = true;
						break;
					}
				}
				//反之，则添加
				if(flag==false){
					list.add(path);
					jl.setListData(list);
				}
				String lrcName = getLrcName(path);
				try {
					getLrcContxt(lrcName,jta);
				} catch (Exception e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
				System.out.println(path);				
				tempPlayer = PlayMusic.playMusic(path);
			}
		});	
		
		jmi_stop.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				PlayMusic.stopMusic(tempPlayer);
			}
		});
	}
	
	public static void main(String args[]){
		PlayerFrame pf =  new PlayerFrame();
	}
	
	private JScrollPane jspl;
	private JScrollPane jspr;

	private JList jl;
	private JTextArea jta;
	
	private JMenuBar jmb;
	private JMenu jm;
	private JMenuItem jmi_open;
	private JMenuItem jmi_stop;
	
	private static String path;
	private static Vector list = new Vector();
	private static Player tempPlayer = null;
	private static Boolean flag_contxt = true;
}

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