Links em aplicativos

try {

   Url url = new URL( "http://www.portaljava.com" );
   
   AppletContext appletContext = getAppletContext();

   appletContext.showDocument( url );

} catch ( MalformedURLException e ) {
     urlException.printStackTrace();
  }

package src;

import java.awt.Container;
import java.awt.Cursor;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import javax.swing.Icon;
import javax.swing.JEditorPane;
import javax.swing.JInternalFrame;
import javax.swing.JScrollPane;
import javax.swing.JViewport;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
import javax.swing.text.Document;

/** CLASSE help<br>
 * ------------------------------------<br>
 * Projeto..: medicSystem<br>
 * Descrição: Abre a ajuda do sistema em formato HTML
 * Direitos.: Paulo César Machado Jeveaux (c) 22/08/2003<br>
 * @autor...: Paulo César Machado Jeveaux<br>
 */
public class help extends JInternalFrame {
  
    public help() {
	super("Tópicos de ajuda", true, true, true, true);

    setFrameIcon( (Icon)UIManager.get("Tree.openIcon"));
	setBounds( 200, 25, 400, 400);
	HtmlPane html = new HtmlPane();
	setContentPane(html);
    }

}


class HtmlPane extends JScrollPane implements HyperlinkListener {
    JEditorPane html;

    public HtmlPane() {
	try {
	    File f = new File ("src/HelpFiles/toc.htm");
	    String s = f.getAbsolutePath();
	    s = "file:"+s;
	    URL url = new URL(s);
	    html = new JEditorPane(s);
	    html.setEditable(false);
	    html.addHyperlinkListener(this);

	    JViewport vp = getViewport();
	    vp.add(html);
	} catch (MalformedURLException e) {
	    System.out.println("Malformed URL: " + e);
	} catch (IOException e) {
	    System.out.println("IOException: " + e);
	}	
    }


    public void hyperlinkUpdate(HyperlinkEvent e) {
	if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
	    linkActivated(e.getURL());
	}
    }

    protected void linkActivated(URL u) {
	Cursor c = html.getCursor();
	Cursor waitCursor = Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR);
	html.setCursor(waitCursor);
	SwingUtilities.invokeLater(new PageLoader(u, c));
    }

    class PageLoader implements Runnable {
	
	PageLoader(URL u, Cursor c) {
	    url = u;
	    cursor = c;
	}

        public void run() {
	    if (url == null) {
		html.setCursor(cursor);

		Container parent = html.getParent();
		parent.repaint();
	    } else {
		Document doc = html.getDocument();
		try {
		    html.setPage(url);
		} catch (IOException ioe) {
		    html.setDocument(doc);
		    getToolkit().beep();
		} finally {
		    url = null;
		    SwingUtilities.invokeLater(this);
		}
	    }
	}

	URL url;
	Cursor cursor;
    }

}