Applet写的视频播放器

package com.test; import java.applet.Applet; import java.awt.BorderLayout; import java.awt.Component; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import javax.media.CachingControl; import javax.media.CachingControlEvent; import javax.media.ControllerErrorEvent; import javax.media.ControllerEvent; import javax.media.ControllerListener; import javax.media.EndOfMediaEvent; import javax.media.Manager; import javax.media.NoPlayerException; import javax.media.Player; import javax.media.RealizeCompleteEvent; import javax.media.Time; /** * This is a Java Applet that demonstrates how to create a simple * media player with a media event listener. It will play the * media clip right away and continuously loop. * * <!-- Sample HTML * <applet code=TypicalPlayerApplet width=320 height=300> * <param name=file value="Astrnmy.avi"> * </applet> * --> */ public class TypicalPlayerApplet extends Applet implements ControllerListener { // media player Player player = null; // component in which video is playing Component visualComponent = null; // controls gain, position, start, stop Component controlComponent = null; // displays progress during download Component progressBar = null; /** * Read the applet file parameter and create the media * player. */ public void init() { setLayout(new BorderLayout()); // input file name from html param String mediaFile = null; // URL for our media file URL url = null; // URL for doc containing applet URL codeBase = getDocumentBase(); // Get the media filename info. // The applet tag should contain the path to the // source media file, relative to the html page. if ((mediaFile = getParameter("file")) == null) { Fatal("Invalid media file parameter"); //mediaFile="test.avi"; } try { // Create an url from the file name and the url to the // document containing this applet. if ((url = new URL(codeBase, "video\\"+mediaFile)) == null) Fatal("Can't build URL for " + mediaFile); // Create an instance of a player for this media try { if ((player = Manager.createPlayer(url)) == null) Fatal("Could not create player for "+url); } catch (NoPlayerException e) { // TODO Auto-generated catch block e.printStackTrace(); } // Add ourselves as a listener for player's events player.addControllerListener(this); } catch (MalformedURLException u) { Fatal("Invalid media file URL!"); } catch(IOException i) { Fatal("IO exception creating player for "+url); } // This applet assumes that its start() calls // player.start().This causes the player to become // Realized. Once Realized, the Applet will get // the visual and control panel components and add // them to the Applet. These components are not added // during init() because they are long operations that // would make us appear unresposive to the user. } /** * Start media file playback. This function is called the * first time that the Applet runs and every * time the user re-enters the page. */ public void start() { // Call start() to prefetch and start the player. if (player != null) player.start(); } /** * Stop media file playback and release resources before * leaving the page. */ public void stop() { if (player != null) { player.stop(); player.deallocate(); } } /** * This controllerUpdate function must be defined in order * to implement a ControllerListener interface. This * function will be called whenever there is a media event. */ public synchronized void controllerUpdate(ControllerEvent event) { // If we're getting messages from a dead player, // just leave if (player == null) return; // When the player is Realized, get the visual // and control components and add them to the Applet if (event instanceof RealizeCompleteEvent) { if ((visualComponent = player.getVisualComponent()) != null) add("Center", visualComponent); if ((controlComponent = player.getControlPanelComponent()) != null) add("South",controlComponent); // force the applet to draw the components validate(); } else if (event instanceof CachingControlEvent) { // Put a progress bar up when downloading starts, // take it down when downloading ends. CachingControlEvent e = (CachingControlEvent) event; CachingControl cc = e.getCachingControl(); long cc_progress = e.getContentProgress(); long cc_length = cc.getContentLength(); // Add the bar if not already there ... if (progressBar == null) if ((progressBar = cc.getProgressBarComponent()) != null) { add("North", progressBar); validate(); } // Remove bar when finished ownloading if (progressBar != null) if (cc_progress == cc_length) { remove (progressBar); progressBar = null; validate(); } } else if (event instanceof EndOfMediaEvent) { // We've reached the end of the media; rewind and // start over player.setMediaTime(new Time(0)); player.start(); } else if (event instanceof ControllerErrorEvent) { // Tell TypicalPlayerApplet.start() to call it a day player = null; Fatal (((ControllerErrorEvent)event).getMessage()); } } void Fatal (String s) { // Applications will make various choices about what // to do here. We print a message and then exit System.err.println("FATAL ERROR: " + s); throw new Error(s); // Invoke the uncaught exception // handler System.exit() is another // choice } }