如何在Java中播放mp3音乐文件（不止一种音乐）？

Question

I write some core java code to a play one mp3 file in java .I was successful. But i want to play more than one mp3 music file sequentially one by one in java.

can it be possible ?? If possible plz help me.

Here is the demo code ,

   import java.io.BufferedInputStream;
    import java.io.FileInputStream;

    import javazoom.jl.player.Player;


    public class MP3 extends Thread{
        static int k=0;
        private String filename;
        private Player player; 

        // constructor that takes the name of an MP3 file
        public MP3(String filename) {
            this.filename = filename;
        }

        public void close() { if (player != null) player.close(); }

        // play the MP3 file to the sound card
        public synchronized void play() {
            try {
                FileInputStream fis = new FileInputStream(filename);
                BufferedInputStream bis = new BufferedInputStream(fis);
                player = new Player(bis);
            }
            catch (Exception e) {
                System.out.println("Problem playing file " + filename);
                System.out.println(e);
            }

            // run in new thread to play in background

            new Thread() {
                public void run() {
                    try { player.play();}
                    catch (Exception e) { System.out.println(e); }
                }
            }.start(); 

        }

        // test client
        public static void main(String[] args) {
            String filename = args[0];
            //StringBuffer br= new StringBuffer(filename);
            StringBuffer mp3_name = new StringBuffer();
            String arr[]=new String[3];
            String mp3temp=filename; 
            for(int i=0;i<mp3temp.length();i++) 
            {
            int count = mp3temp.indexOf(",");
            System.out.println(count);
            if(count != -1)
                 {
                    String temp = mp3temp.substring(0,count);
                    System.out.println(temp);
                    mp3_name.append(temp);
                    arr[k++] = temp;
                    mp3temp = mp3temp.substring(count+1,mp3temp.length());
                }
            if(count == -1)
                {
                    if(mp3temp.endsWith("mp3"))
                        {
                            mp3_name.append(mp3temp);
                            arr[k++] = mp3temp;
                            System.out.println(mp3temp);
                            break;
                        }

                }

            }
            StringBuffer bb=mp3_name;
            String test ="";
            String subtest ="";
            for(int s= 0;s < arr.length;s++)
            {

                System.out.println(arr[s]);

            MP3 mp3 = new MP3(arr[s]);
            mp3.play();
            System.out.println(arr[s]);

            // do whatever computation you like, while music plays
            int N = 4000;
            double sum = 0.0;
            for (int i = 0; i < N; i++) {
                for (int j = 0; j < N; j++) {
                    sum += Math.sin(i + j);
                }
            }
            System.out.println(sum);

            // when the computation is done, stop playing it
               mp3.close();

            // play from the beginning
               mp3 = new MP3(arr[s]);
             mp3.play();

            //}
            }

        }

    }

Pass mp3 files from comand prompt by separating commas. ex :java MP3 test.mp3,a.mp3,b.mp3

Thanks Bipin

Answer 1

It is definitely possible.

If reading from a directory say your C:\\Music, then simple have your program read in all of the locations (I am assuming you are reading in only one at the moment).

Then execute on each of those files by calling your play method(Im assuming you have something similar))

You can loop that method or have it play down the list etc etc.

I can elaborate if you post a snippet of your code.

EDIT: I didnt know you were using command line arguements, so I will try and help the best I can.

You should be able to read in each arguement and have it execute on each one until there are not left using a for loop.

public static void main(String[] args) { 
           //declare the length of your args
           int length = args.length;

Once thats done you can run the play method on each of the songs.

       //Perform your loop
       for (int i = 0; i < length; i++) {
        //Call your play method here  
       } // End Loop
        //When done you can print something
        System.out.println("All Songs have been played"); 
       }

Answer 2

Similar to what birryree said in his comment. You could change the MP3 class to store a list of filenames. Play can then loop over these playing each in turn.