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//程序所用到的各种程序包

import java.awt.BorderLayout;

import java.awt.CheckboxMenuItem;

import java.awt.Color;

import http://www.doczj.com/doc/db45f5a4f524ccbff1218465.htmlponent;

import java.awt.Container;

import java.awt.FileDialog;

import java.awt.Font;

import java.awt.FontMetrics;

import java.awt.Graphics;

import java.awt.Menu;

import java.awt.MenuBar;

import java.awt.MenuItem;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.media.ControllerClosedEvent;

import javax.media.ControllerEvent;

import javax.media.ControllerListener;

import javax.media.EndOfMediaEvent;

import javax.media.GainControl;

import javax.media.Manager;

import javax.media.MediaLocator;

import javax.media.NoPlayerException;

import javax.media.Player;

import javax.media.PrefetchCompleteEvent;

import javax.media.RealizeCompleteEvent;

import javax.media.Time;

import javax.swing.JFrame;

//本程序对应的类；

class MediaPlayer

extends JFrame

implements ActionListener, ControllerListener, ItemListener {

//MediaPlayer类的变量成员的声明；

//JMF提供的播放器对象；

Player player;

Component vc, cc, gcc;

GainControl gc;

//first值用来控制在刚开始程序时显示一幅欢迎界面；loop用以标记是否循环播放；

boolean first = true, loop = false;

//设立一个字符串记录当前打开文件的路径

String currentDirectory;

MediaPlayer(String title) {

super(title);

// 利用一个adapter实现对用户点击窗口系统菜单的关闭按钮

// 时的响应；

addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

//调用dispose以执行windowClosed

dispose();

}

public void windowClosed(WindowEvent e) {

if (player != null)

player.close();

System.exit(0);

}

});

//调用设置程序菜单栏的方法成员完成菜单的布置

setupMenu();

setSize(400, 400);

setVisible(true);

}

//本方法用以设置程序菜单栏

public void setupMenu() {

//设置一个菜单

Menu f = new Menu(“文件”);

//往设置的菜单种添加菜单项

MenuItem mi = new MenuItem(“打开”);

mi.addActionListener(this);

f.add(mi);

f.addSeparator();

CheckboxMenuItem cbmi = new CheckboxMenuItem(“循环”, false);

cbmi.addItemListener(this);

f.add(cbmi);

f.addSeparator();

mi = new MenuItem(“退出”);

mi.addActionListener(this);

f.add(mi);

Menu l = new Menu(“播放列表”);

Menu c = new Menu(“播放控制”);

MenuItem move = new MenuItem(“播放”);

move.addActionListener(this);

c.add(move);

c.addSeparator();

MenuItem pause = new MenuItem(“暂停”);

pause.addActionListener(this);

c.add(pause);

c.addSeparator();

MenuItem stop = new MenuItem(“停止”);

stop.addActionL