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Browser - Java Code Bank

Browser
eh, a browser
                package SimpleWebBrowser;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
import java.net.URL;
public class SimpleWebBrowser extends JPanel {
   public static void main(String[] args) {
      JFrame window = new JFrame("SimpleWebBrowser");
      SimpleWebBrowser content = new SimpleWebBrowser();
      window.setContentPane(content);
      window.setSize(600,500);
      Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
      window.setLocation( (screenSize.width - window.getWidth())/2,
            (screenSize.height - window.getHeight())/2 );
      window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
      window.setVisible(true);
   }
   private JEditorPane editPane;
   private JTextField locationInput;
   private class LinkListener implements HyperlinkListener {
      public void hyperlinkUpdate(HyperlinkEvent evt) {
         if (evt.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
            loadURL(evt.getURL());
         }
      }
   }
   private class GoListener implements ActionListener {
      public void actionPerformed(ActionEvent evt) {
         URL url;
         try {
            String location = locationInput.getText().trim();
            if (location.length() == 0)
               throw new Exception();
            if (! location.contains("://"))
               location = "http://" + location;
            url = new URL(location);
         }
         catch (Exception e) {
            JOptionPane.showMessageDialog(SimpleWebBrowser.this, 
                  "The Location input box does not\nccontain a legal URL.");
            return;
         }
         loadURL(url);
         locationInput.selectAll();
         locationInput.requestFocus();
      }
   }
   public SimpleWebBrowser() {
      setBackground(Color.BLACK);
      setLayout(new BorderLayout(1,1));
      setBorder(BorderFactory.createLineBorder(Color.BLACK,1));
      editPane = new JEditorPane();
      editPane.setEditable(false);
      editPane.addHyperlinkListener(new LinkListener());
      add(new JScrollPane(editPane),BorderLayout.CENTER);
      JToolBar toolbar = new JToolBar();
      toolbar.setFloatable(false);
      add(toolbar,BorderLayout.NORTH);
      ActionListener goListener = new GoListener();
      locationInput = new JTextField("www.hellboundhackers.org", 40);//www.hellboundhackers.org/challenges/real2/backups/
      locationInput.addActionListener(goListener);
      JButton goButton = new JButton(" Go ");
      goButton.addActionListener(goListener);
      toolbar.add( new JLabel(" Location: "));
      toolbar.add(locationInput);
      toolbar.addSeparator(new Dimension(5,0));
      toolbar.add(goButton);
   }
   private void loadURL(URL url) {
      try {
         editPane.setPage(url);
      }
      catch (Exception e) {
         editPane.setContentType("text/plain");
         editPane.setText( "Sorry, the requested document was not found\n"
               +"or cannot be displayed.\n\nError:" + e);
      }
   }
   
}

            
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