mp3controller.java

一款基于java技术实现的纯jsp在线音乐播放器代码.

package paly;

import javax.media.Player;

public class Mp3Controller{
    private Mp3State mp3;
    
    public Mp3Controller(Mp3State mp3){
        this.mp3 = mp3;
    }
    
    public void mp3Start(){
        if(!mp3.getIsStarted()){
            mp3.setTriggerStart(true);
        } else {
            System.out.println("Error: A song is playing now, thus player cannot start another");
        }
    }
    
    public void mp3Stop() {
        if(mp3.getIsStarted()){
            Player player = mp3.getPlayer();
            player.stop();
            player.deallocate();
            player.close();
            mp3.setIsStarted(false);
            mp3.setTriggerStart(false);
            mp3.setCurrentIndex(mp3.getCurrentIndex() - 1);
        } else if(mp3.getIsPaused()){
            mp3.setIsPaused(false);
            mp3.setPauseTime(null);
        } else {
            System.out.println("Error: No song has been playing yet, thus can not been stopped");
        }
    }
    
    public void mp3Next(){
        if(mp3.getIsStarted() || mp3.getIsPaused()){
            this.mp3Stop();
        }
        int currentIndex = mp3.getCurrentIndex();
        if(currentIndex < (mp3.getSonglist().size() - 1)){
            mp3.setCurrentIndex( currentIndex + 1);
            this.mp3Start();
        } else {
            System.out.println("Error: End of the songlist");
        }
    }
    
    public void mp3Previous() {
        if(mp3.getIsStarted()){
            this.mp3Stop();
        }
        if(mp3.getIsPaused()){
            mp3.setPauseTime(null);
            mp3.setIsPaused(false);
        }
        int currentIndex = mp3.getCurrentIndex();
        if(currentIndex > 0){
            mp3.setCurrentIndex( currentIndex - 1);
            this.mp3Start();
        } else {
            System.out.println("Error: Start of the songlist");
        }
    }
    
    public void mp3Pause() {
        if(mp3.getIsStarted()){
            Player player = mp3.getPlayer();
            mp3.setPauseTime(player.getMediaTime());
            player.stop();
            player.deallocate();
            player.close();
            mp3.setIsStarted(false);
            mp3.setIsPaused(true);
            mp3.setTriggerStart(false);
            mp3.setCurrentIndex(mp3.getCurrentIndex() - 1);
        } else {
            System.out.println("Error: No song has been playing yet, thus can not paused");
        }
    }
}