jmusic.java

本程序不仅实现了记事本基本的功能

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package jnotepad;

import java.awt.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import javax.media.*;
import java.io.*;
import java.util.*;//为了导入Vector

/**
 *
 * @author Administrator
 */
class JMusic {

    private JPanel panel = new JPanel();
    public int int_mode = 0;
    public int index = 0;
    private Player player;//Play是个实现Controller的接口
    public File file,  musiclistfile;//利用File类结合JFileChooser进行文件打开操作
    public Vector VfileName,  VdirName;
    private String filename;

    JMusic(JPanel jp)//构造函数
    {
        panel = jp;
        VfileName = new Vector();
        VdirName = new Vector();
        musiclistfile = new File("歌曲列表.txt");
        this.initMusiclist();
    }

    public void openFile() {
        JFileChooser filechooser = new JFileChooser();
        filechooser.setCurrentDirectory(file);
        filechooser.setFileFilter(new javax.swing.filechooser.FileFilter() {

            public boolean accept(File f) {
                return f.getName().toLowerCase().endsWith(".mp3") || f.isDirectory();
            }

            public String getDescription() {
                return "音乐文件(*.mp3)";
            }
        });

        filechooser.showOpenDialog(null);
        if ((file = filechooser.getSelectedFile()) != null) {
            createPlayer();
        }
    }

    private void createPlayer() {
        filename = file.getName();
        String suffix = filename.substring(filename.lastIndexOf(".") + 1);

        if (!suffix.equals("mp3")) {
            String extendName = "此播放器好象不支持" + suffix + "格式";
            JOptionPane.showMessageDialog(null, extendName, "出错了!!", JOptionPane.ERROR_MESSAGE);
            return;
        }
        closePreviosPlayer();//关闭先前的媒体播放器      
        try {
            player = Manager.createPlayer(file.toURL());//javax.media.Manager直接继承于java.lang.object,且它为final,不能被继承
            player.addControllerListener(new ControllerHand());//!!!!!!!
            player.start();
            addList(file);
        } catch (Exception e) {
        }
    }

    private void closePreviosPlayer() {
        if (player == null) {
            return;
        }
        player.stop();
        player.deallocate(); //停止播放并且重新装载DateSource
    }

    private class ControllerHand implements ControllerListener {

        public void controllerUpdate(ControllerEvent e) {

            if (e instanceof RealizeCompleteEvent) {

                Component control = player.getControlPanelComponent();

                if (control != null) {
                    panel.removeAll();
                    panel.add(control, BorderLayout.SOUTH);
                }
                panel.doLayout();
                panel.getParent().validate();
                return;
            }
            if (e instanceof EndOfMediaEvent) {
                if (int_mode == 0) {
                    if (VfileName.size() == 0) {
                        return;
                    }
                    index = (int) (Math.random() * VfileName.size());
                    index %= VfileName.size();
                }
                if (int_mode == 1) {
                    if (VfileName.size() == 0) {
                        return;
                    }
                    index = (index + 1) % VfileName.size();
                }
                if (int_mode == 2) {
                    player.setMediaTime(new Time(0));
                    player.start();
                }
                createPlayer2();
            }
        }
    }

    private void addList(File file) {
        index = VfileName.size();
        VfileName.addElement(file.getName());
        VdirName.addElement(file.getPath());
    }

    public void createPlayer2() {
        try {
            filename = VdirName.elementAt(index).toString();
        } catch (ArrayIndexOutOfBoundsException e) {
            return;
        }
        file = new File(filename);
        closePreviosPlayer();//关闭先前的媒体播放器
        try {
            player = Manager.createPlayer(file.toURL());//javax.media.Manager直接继承于java.lang.object,且它为final,不能被继承

            player.addControllerListener(new ControllerHand());
            player.start();

        } catch (Exception e) {
        }
    }

    public void saveMusiclist() {
        try {
            BufferedWriter writer = new BufferedWriter(new FileWriter(musiclistfile));
            int size = VdirName.size();
            for (int i = 0; i < size; i++) {
                writer.write((String) VdirName.get(i) + "\n");
                writer.write((String) VfileName.get(i) + "\n");
            }
            writer.flush();
            writer.close();
        } catch (IOException ex) {
            Logger.getLogger(JMusic.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    private void initMusiclist() {
        try {
            if (!musiclistfile.exists()) {
                musiclistfile.createNewFile();//防止不存在此文件发生读取错误，这两行代码保证不存在的情况下自动建立
                return;
            }
            BufferedReader read = new BufferedReader(new FileReader(musiclistfile));
            String dirstr = "";
            String filestr = "";
            do {
                dirstr = read.readLine();
                File filemp3 = new File(dirstr);
                if (!filemp3.exists() || !dirstr.endsWith("mp3")) {
                    break;
                }
                VdirName.addElement(dirstr);
                filestr = read.readLine();
                if (!dirstr.endsWith(filestr)) {
                    VdirName.remove(VdirName.size() - 1);
                    break;
                }
                VfileName.addElement(file);

            } while (dirstr != null && filestr != null);
            read.close();
        } catch (Exception ex) {
        }
        if (VfileName.size() > 0) {
            index = (int) (Math.random() * (VfileName.size() - 1));//产生随即数，进行随即播放
            createPlayer2();
        }
    }
}