A simple redirection applet Java code example - Click here to copy ->>>

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Code:



 

/*

 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.

 * All rights reserved. Software written by Ian F. Darwin and others.

 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $

*/



import java.awt.*;

import java.awt.event.*;

import java.applet.*;

import java.net.*;



/** A simple redirection applet.

 * @author Ian Darwin

 */

public class Redir extends Applet implements Runnable {

   protected String urlString;

   protected URL theNewURL;

   protected final static int NSECONDS = 5;

   protected Thread t;



   public void init() {

      try {

         // Get the address from a PARAM...

         urlString = getParameter("URL");

         if (urlString == null)  {

            urlString = "MISSING URL";

            throw new IllegalArgumentException(

            "Redir requires a URL parameter in the HTML");

         }



         // Make up the URL object

         theNewURL = new URL(urlString);



         // debug...

         // showStatus("URL = " + theNewURL);



      } catch (Exception err) {

         System.err.println("Error!\n" + err);

         showStatus("Error, look in Java Console for details!");

      }

   }



   public void start() {

      if (theNewURL == null)

         return;



      t = new Thread(this);

      t.start();

   }



   /** Print a little message to the user. */

   public void paint(Graphics g) {

      if (urlString != null)

         g.drawString(urlString, 20, 50);

      else

         g.drawString("Initializing...", 20, 50);

   }



   /** If users moves off the page, set Thread t to null so

    * we don't showDo*****ent from within the middle of the new page!

    */

   public void stop() {

      t = null;

   }



   /** run, called by the Thread, does the work of sleeping

    * for a fixed number of seconds then, if the user hasn't

    * moved off the page, actually passing control to the new page.

    */

   public void run() {

      for (int i=NSECONDS; i>=0; i--) {

         try {

            Thread.sleep(1000);

            if (t == null)

               return;

         } catch (InterruptedException e) {

            // so what?

         }

         if (t == null)

            return;

         showStatus(Integer.toString(i));



         if (t == null)

            return;



         showStatus("Ignition!");

         // "And then a miracle occurs..."

         getAppletContext().showDo*****ent(theNewURL);

      }

   }

}