fmplayer.java

通过java环境下运行流媒体播放器

import javax.media.*; 
import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*;

class FMPlayer extends Frame implements ControllerListener{ 
	Player player; //JMF中的Player类
	Component visualcmp, controlcmp; //视觉部件和控制部件
	Panel pane;
	TextField textfield;
	Button button;
	String string; 
	Label label;
	
	FMPlayer (String title) {//构造体 
		super (title);//引用父类的构造函数 
		addWindowListener (new WindowAdapter () {//响应关闭窗口的事件
			public void windowClosing (WindowEvent e) { //关闭窗口 
				dispose ();  
			} 
			public void windowClosed (WindowEvent e) { 
				if (player != null) player.close (); 
				System.exit (0); 
			} 
		}); 
		//交互界面的
	pane = new Panel();
	string = new String();
	label = new Label("要播放文件的URL:");
	textfield = new TextField("http://localhost:8080/try.mpg",30);
	button = new Button("确定");
	button.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button_actionPerformed(e);
      }
    });
    add(pane,BorderLayout.NORTH);
    pane.add(label);
	pane.add(textfield);
	pane.add(button);
	setSize (450, 80); 
	setVisible (true); 

	} 

	public void button_actionPerformed (ActionEvent e) { 
		string = textfield.getText();
		if(string.compareTo("") != 0){
			if (player != null) player.close (); 
			try { 
				player = Manager.createPlayer (new MediaLocator (string));
			} 
			catch (java.io.IOException e2) { 
				System.out.println (e2); 
				return; 
			} 
			catch (NoPlayerException e2) { 
				System.out.println ("不能创建播放器"); 
				return; 
			} 
		}

		if (player == null) { 
			System.out.println ("創建播放器失败."); 
			return; 
		} 

		player.addControllerListener (this); //监听控制事件
		player.prefetch (); //预先提取媒体内容 
	} 



public void controllerUpdate (ControllerEvent e) { //监听控制器
	if (e instanceof ControllerClosedEvent) { //关闭控制器，移除部件
		if (visualcmp != null) { 
			remove (visualcmp); 
			visualcmp = null; 
		} 

		if (controlcmp != null) { 
			remove (controlcmp); 
			controlcmp = null; 
		} 
		return; 
	} 

	if (e instanceof PrefetchCompleteEvent) { //预取媒体内容结束，开始播放
		player.start (); 
		return; 
	} 
	
	if (e instanceof RealizeCompleteEvent) { //实例化结束
		visualcmp = player.getVisualComponent (); 
		if (visualcmp != null) add (visualcmp,BorderLayout.CENTER); 
		controlcmp = player.getControlPanelComponent (); 
		if (controlcmp != null) add (controlcmp,BorderLayout.SOUTH); 
		pack (); //整合
	} 
} 

public void paint (Graphics g) { 
	super.paint (g);//调用父类的方法
} 

public void update (Graphics g) { 
	paint (g); 
} 

public static void main (String [] args) { //主程序
	new FMPlayer ("流媒体播放器"); 
	} 

}