Implementierungsbeispiel eines Java-Musikplayers

package cn.hncu.games;
import java.applet.Applet;
import java.applet.AudioClip;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;
import java.net.URL;

import javax.swing.DefaultListModel;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.ListModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class MusicPlayer extends JFrame{
  //显示(歌曲名称)播放状态的标签
  JLabel songNameLabel = null;

  //四个播放功能键按钮
  JButton btnLast = null; //上一曲
  JButton btnPlay = null; //播放/停止
  JButton btnNext = null; //下一曲
  JButton btnLoop = null; //循环

  //歌曲列表
  JList songsList = null;
  AudioClip songs[] = null;
  AudioClip currentSong = null;
  int index=0; //当前歌曲在JList中的位置(序号)
  //歌曲文件名数组---String
  String[] strSongNames={ "song1.wav","song2.wav","song3.wav","song4.wav","song5.wav","song6.wav" };
  final String DIR="songs\\";

  //播放音乐的线程
  Thread playerThread=null;
  boolean isPlayOrStop = true;//true代表播放状态
  boolean isLoop = false; //是否为循环状态

  public MusicPlayer() {
    super("音乐播放器");
    setBounds(300, 50, 310, 500);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setLayout(null);
    //hello();

    //显示(歌曲名称)播放状态的标签
    songNameLabel = new JLabel();
    Font songNameFont = new Font("黑体",Font.ITALIC,18);
    songNameLabel.setFont(songNameFont);
    songNameLabel.setText("我的音乐播放器");
    songNameLabel.setBounds(10, 10, 300, 40);
    getContentPane().add(songNameLabel);

    //四个播放功能键按钮
    btnLast = new JButton();
    btnPlay = new JButton();
    btnNext = new JButton();
    btnLoop = new JButton();
    //位置大小
    btnLast.setBounds(10, 70, 50, 40);
    btnPlay.setBounds(70, 70, 50, 40);
    btnNext.setBounds(130, 70, 50, 40);
    btnLoop.setBounds(190, 70, 50, 40);
    //设置图片
    btnLast.setIcon( new ImageIcon("images2/1.png"));
    btnPlay.setIcon( new ImageIcon("images2/2.png"));
    btnNext.setIcon( new ImageIcon("images2/3.png"));
    btnLoop.setIcon( new ImageIcon("images2/4.png"));
    //添加到框架
    getContentPane().add(btnLast);
    getContentPane().add(btnPlay);
    getContentPane().add(btnNext);
    getContentPane().add(btnLoop);
    //添加监听
    MyMouseListener mml = new MyMouseListener();
    btnLast.addMouseListener(mml);
    btnPlay.addMouseListener(mml);
    btnNext.addMouseListener(mml);
    btnLoop.addMouseListener(mml);


    //歌曲列表的标题
    JLabel listLabel = new JLabel("播放列表");
    listLabel.setBounds(10, 120, 100, 30);
    Font listLabelFont = new Font("黑体",Font.BOLD,16);
    listLabel.setFont(listLabelFont);
    getContentPane().add(listLabel);

    //歌曲列表
    /*
    songsList = new JList();
    songsList.setBounds(10, 150, 250, 300);
    songsList.setBackground(Color.CYAN);
    //把所有歌曲名逐个添加到List中
    //songsList.setListData(strSongNames);
    for(int i=0;i<strSongNames.length;i++){
      DefaultListModel dm = (DefaultListModel)songsList.getModel();
      dm.add(i,strSongNames[i]);
    }
    getContentPane().add(songsList);
    */

    DefaultListModel lm = new DefaultListModel();
    songsList = new JList(lm);
    songsList.setBounds(10, 150, 250, 300);
    songsList.setBackground(Color.CYAN);
    //把所有歌曲名逐个添加到List中
    //songsList.setListData(strSongNames);
    songs = new AudioClip[strSongNames.length];
    for(int i=0;i<strSongNames.length;i++){
      lm.add(i,strSongNames[i]);
      songs[i] = loadSound(strSongNames[i]);
    }
    getContentPane().add(songsList);
    //lm.remove(3);

    //对JList控件的监听技术实现
    songsList.addListSelectionListener(new ListSelectionListener() {
      @Override
      public void valueChanged(ListSelectionEvent e) {
        currentSong.stop();
        index = songsList.getSelectedIndex();
        isPlayOrStop = true;
        playerThread = new Thread( new MusicRun() );
        playerThread.start();
      }
    });


    //单开一个线程，专用于播放音乐
    playerThread = new Thread( new MusicRun() );
    playerThread.start();


    setVisible(true);
  }



  private AudioClip loadSound(String fileName) {
    try {
      URL url = new URL("file:songs\\"+fileName);
      AudioClip au = Applet.newAudioClip(url);
      return au;
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;
  }


  //讲解音乐播放的基本技术
  private void hello() {
    try {
      File f = new File("songs\\song1.wav");
      URL url = f.toURI().toURL();
      //URL url = new URL("file:songs\\song1.wav");
      AudioClip au = Applet.newAudioClip(url);
      au.play();
      //au.loop();
      //au.stop();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  private class MyMouseListener extends MouseAdapter{
    @Override
    public void mouseClicked(MouseEvent e) {
      JButton btn = (JButton) e.getSource();
      currentSong.stop();
      if(btn==btnPlay){
        isPlayOrStop = !isPlayOrStop;
      }else if(btn==btnLast){
        index--;
        if(index<0){
          index = strSongNames.length-1;
        }
        //isPlayOrStop=true;
      }else if(btn==btnNext){
        index++;
        index = index%strSongNames.length;

      }else if(btn==btnLoop){
        isLoop = !isLoop;
      }

      if(isPlayOrStop){//播放
        playerThread = new Thread( new MusicRun() );
        playerThread.start();
      }else{//停止
        songsList.setSelectedIndex(index);
        songNameLabel.setText("停止播放:"+strSongNames[index]);
        btnPlay.setIcon( new ImageIcon("images2/2.png"));
      }
    }
  }

  private class MusicRun implements Runnable{
    @Override
    public void run() {
      currentSong = songs[index];
      if(isLoop){
        currentSong.loop();
        songNameLabel.setText("循环播放:"+strSongNames[index]);
      }
      if (isPlayOrStop) {
        currentSong.play();
      }
      //在播放列表中选定当前歌曲
      songsList.setSelectedIndex(index);
      //把播放按钮的图标切换成“停止”
      btnPlay.setIcon( new ImageIcon("images2/5.png"));

      if(!isLoop){
        songNameLabel.setText("正在播放:"+strSongNames[index]);
      }
    }
  }
public static void main(String[] args) {
    new MusicPlayer();
  }
}