mediaframe.java

Java实例入门

package javamediaplayer;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.io.*;
import java.net.*;
import javax.media.*;
import javax.media.bean.playerbean.*;
/**
 * Title:        使用Java制作的媒体播放器
 * Description:  这个播放器利用了Java Media Frame API来实现主要功能
 * Copyright:    Copyright (c) 2001
 * Company:
 * @author
 * @version 1.0
 */

public class MediaFrame extends JFrame  implements ControllerListener{
  JPanel contentPane;
  JMenuBar jMenuBar1 = new JMenuBar();
  JMenu jMenuFile = new JMenu();
  JMenuItem jMenuFileExit = new JMenuItem();
  JMenu jMenuHelp = new JMenu();
  JMenuItem jMenuHelpAbout = new JMenuItem();
  JLabel statusBar = new JLabel();
  BorderLayout borderLayout1 = new BorderLayout();
  JMenuItem jMenuOpenFile = new JMenuItem();
  JMenuItem jMenuOpenUrl = new JMenuItem();
  JPanel jPanelVideo = new JPanel();
  BorderLayout borderLayout2 = new BorderLayout();
  JMenu jMenuCtrl = new JMenu();
  JCheckBoxMenuItem jCheckBoxMenuAutoRep = new JCheckBoxMenuItem();
  MediaPlayer player;
  Component visualComponent=null;
  Component controlComponent=null;
  boolean displaying=false;
  String currentFile="";
  String currentUrl="";

  /**Construct the frame*/
  public MediaFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception  {
    //setIconImage(Toolkit.getDefaultToolkit().createImage(MediaFrame.class.getResource("[Your Icon]")));
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    jMenuCtrl.setText("Control");
    jCheckBoxMenuAutoRep.setText("Auto Replay");
    jCheckBoxMenuAutoRep.addItemListener(new java.awt.event.ItemListener() {
      public void itemStateChanged(ItemEvent e) {
        jCheckBoxMenuAutoRep_itemStateChanged(e);
      }
    });
    contentPane.add(statusBar, BorderLayout.SOUTH);
    contentPane.add(jPanelVideo, BorderLayout.CENTER);
    this.setSize(new Dimension(400, 300));
    this.setTitle("媒体播放器");
    statusBar.setText(" ");
    JPopupMenu.setDefaultLightWeightPopupEnabled(false) ;
    jMenuFile.setText("File");
    jMenuFileExit.setText("Exit");
    jMenuFileExit.addActionListener(new ActionListener()  {
      public void actionPerformed(ActionEvent e) {
        jMenuFileExit_actionPerformed(e);
      }
    });
    jMenuHelp.setText("Help");
    jMenuHelpAbout.setText("About");
    jMenuHelpAbout.addActionListener(new ActionListener()  {
      public void actionPerformed(ActionEvent e) {
        jMenuHelpAbout_actionPerformed(e);
      }
    });
    jMenuOpenFile.setText("Open File...");
    jMenuOpenFile.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jMenuOpenFile_actionPerformed(e);
      }
    });
    jMenuOpenUrl.setText("Open Url...");
    jMenuOpenUrl.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jMenuOpenUrl_actionPerformed(e);
      }
    });
    jPanelVideo.setLayout(borderLayout2);
    jMenuFile.add(jMenuOpenFile);
    jMenuFile.add(jMenuOpenUrl);
    jMenuFile.add(jMenuFileExit);
    jMenuHelp.add(jMenuHelpAbout);
    jMenuBar1.add(jMenuFile);
    jMenuBar1.add(jMenuCtrl);
    jMenuBar1.add(jMenuHelp);
    this.setJMenuBar(jMenuBar1);
    jMenuCtrl.add(jCheckBoxMenuAutoRep);
  }
  /**File | Exit action performed*/
  public void jMenuFileExit_actionPerformed(ActionEvent e) {
    System.exit(0);
  }
  /**Help | About action performed*/
  public void jMenuHelpAbout_actionPerformed(ActionEvent e) {
    MediaFrame_AboutBox dlg = new MediaFrame_AboutBox(this);
    Dimension dlgSize = dlg.getPreferredSize();
    Dimension frmSize = getSize();
    Point loc = getLocation();
    dlg.setLocation((frmSize.width - dlgSize.width) / 2 + loc.x, (frmSize.height - dlgSize.height) / 2 + loc.y);
    dlg.setModal(true);
    dlg.show();
  }
  /**Overridden so we can exit when window is closed*/
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      jMenuFileExit_actionPerformed(null);
    }
  }

  void jMenuOpenUrl_actionPerformed(ActionEvent e) {
     try{
         OpenUrlDlg urlDlg=new OpenUrlDlg(this,currentUrl);
         urlDlg.show();
        if(urlDlg.getAction() ==OpenUrlDlg.ACTION_OPEN ){
             URL selUrl=new URL(urlDlg.getUrl());
            if(selUrl!=null) open(selUrl);
              currentUrl=selUrl.toString();
        }
        this.repaint() ;
     }catch(Exception ex){
     }
  }

  void jMenuOpenFile_actionPerformed(ActionEvent e) {
     JFileChooser fileOpenDlg=new JFileChooser();
     String FileName="";
     if(!currentFile.equals("") ){
         fileOpenDlg.setSelectedFile(new File(currentFile));
     }
    if(JFileChooser.APPROVE_OPTION== fileOpenDlg.showOpenDialog(this)){
         File selFile=fileOpenDlg.getSelectedFile();
        if(selFile!=null) FileName=selFile.getPath() ;
    }
   this.repaint() ;
   if(!FileName.equals("")) {
       open(FileName);
   }

  }
  void open(String FileName){
     try{
         URL selUrl=new URL("file://"+FileName);
         currentFile=FileName;
         open(selUrl);
     }catch(Exception e){
         System.out.println(e) ;
     }
  }
  void open(URL selUrl) throws Exception {
     killCurrentPlayer() ;
     displaying=false;
     player=new MediaPlayer();
     player.addControllerListener(this) ;
     player.setMediaLocation(selUrl.toString());
     player.setPlaybackLoop(jCheckBoxMenuAutoRep.getState());
     player.realize();
     statusBar.setText("文件:"+selUrl.toString());
  }
  public synchronized void controllerUpdate ( ControllerEvent event ) {
    if ( event instanceof RealizeCompleteEvent ) {
        visualComponent=null;
        controlComponent=null;
       if((visualComponent=player.getVisualComponent())!=null){
           jPanelVideo.add(visualComponent,"Center");
       }
      if((controlComponent=player.getControlPanelComponent())!=null){
           jPanelVideo.add(controlComponent,"South");
       }
       resizePanel();
      this.pack() ;
      displaying=true;
      player.prefetch();
    }
    else if ( event instanceof PrefetchCompleteEvent ) {
       player.start();
    }
    this.validate();
  }
  void resizePanel(){
    Dimension dimVisual=new Dimension(0,0);
    Dimension dimControl=new Dimension(0,0);
   int width=0;
   int height=0;

    if(visualComponent!=null)
      dimVisual= visualComponent.getPreferredSize();
    if(controlComponent!=null)  {
       dimControl=controlComponent.getPreferredSize();
    }
    width=dimVisual.width;
    height=dimControl.height+dimVisual.height;
    if(width==0) width=100;
    if(height==0) height=50;
    jPanelVideo.setSize(width, height);
  }
  void rePaint(){
    jPanelVideo.repaint();
    super.repaint() ;
  }
  void killCurrentPlayer () {
        killCurrentView ();
     if ( player != null ) {
            player.close ();
            player.removeControllerListener ( this );
            player = null;
        }
        displaying=false;
  }
  void killCurrentView () {
     if(displaying){
        if(visualComponent!=null)
           jPanelVideo.remove(visualComponent);
        if(controlComponent!=null)
           jPanelVideo.remove(controlComponent);
        visualComponent=null;
        controlComponent=null;
     }

 }

  void jCheckBoxMenuAutoRep_itemStateChanged(ItemEvent e) {
     if(player!=null)  player.setPlaybackLoop(jCheckBoxMenuAutoRep.getState() );
  }
}