programming-examples/java/Servlets_Session_Swing_Util/Demonstrating the Java Media Player.java

Demonstrating the Java Media Player

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

 public class MediaPlayerDemo extends JFrame 
 {
	 private Player player;
	 private File file;

	 public MediaPlayerDemo()
	 {
		 super( "Demonstrating the Java Media Player" );

		 JButton openFile = new JButton( "Open file to play" );
		 openFile.addActionListener( new ActionListener() 
		 {
			 public void actionPerformed( ActionEvent e )
			 {
				 openFile();
				 createPlayer();
			 }
		 });
		 getContentPane().add( openFile, BorderLayout.NORTH );

		 setSize( 300, 300 );
		 show();
	 }

	 private void openFile()
	 {
		 JFileChooser fileChooser = new JFileChooser();

		 fileChooser.setFileSelectionMode( JFileChooser.FILES_ONLY );
		 int result = fileChooser.showOpenDialog( this );

		 // user clicked Cancel button on dialog
		 if ( result == JFileChooser.CANCEL_OPTION )
			 file = null;
		 else
			 file = fileChooser.getSelectedFile();
	 }

	 private void createPlayer()
	 {
		 if ( file == null )
			 return;

		 removePreviousPlayer();

		 try 
		 {
			 // create a new player and add listener
			 player = Manager.createPlayer( file.toURL() );
			 player.addControllerListener( new EventHandler() );
			 player.start(); // start player
		 }
		 catch ( Exception e )
		 {
			 JOptionPane.showMessageDialog( this, "Invalid file or location", "Error loading file",
			 JOptionPane.ERROR_MESSAGE );
		 }
	 }

	 private void removePreviousPlayer()
	 {
		 if ( player == null )
			 return;

		 player.close();

		 Component visual = player.getVisualComponent();
		 Component control = player.getControlPanelComponent();

		 Container c = getContentPane();

		 if ( visual != null )
			 c.remove( visual );

		 if ( control != null )
			 c.remove( control );
	 }

	 public static void main(String args[])
	 {
		 MediaPlayerDemo app = new MediaPlayerDemo();

		 app.addWindowListener( new WindowAdapter() 
		 {
			 public void windowClosing( WindowEvent e )
			 {
				 System.exit(0);
			 }
		 });
	 }

	 // inner class to handler events from media player
	 private class EventHandler implements ControllerListener 
	 {
		 public void controllerUpdate( ControllerEvent e ) 
		 {
			 if ( e instanceof RealizeCompleteEvent ) 
			 {
				 Container c = getContentPane();

				 // load Visual and Control components if they exist
				 Component visualComponent = player.getVisualComponent();

				 if ( visualComponent != null )
					 c.add( visualComponent, BorderLayout.CENTER );

				 Component controlsComponent = player.getControlPanelComponent();

				 if ( controlsComponent != null )
					 c.add( controlsComponent, BorderLayout.SOUTH );

				 c.doLayout();
			 }
		 }
	 }
 }