java简单媒体播放器源码.

//程序所用到的各种程序包

import java.awt.BorderLayout;

import java.awt.CheckboxMenuItem; import java.awt.Color;

import ponent;

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;

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.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.addActionListener(this; c.add(stop;

c.addSeparator(;

//设置一个菜单栏

MenuBar mb = new MenuBar(;

//将设置的菜单依次加入程序的菜单栏中去 mb.add(f;

mb.add(c;

mb.add(l;

//将构造完成的菜单栏交给当前程序的窗口; setMenuBar(mb;