Local HTTP file question

[Marcus Laubli]

I found the following code on the web:

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
 
/** Very simplistic "Web browser" using Swing. Supply a URL on the 
 *  command line to see it initially, and to set the destination
 *  of the "home" button.
 *  1998 Marty Hall, <a href="http://www.apl.jhu.edu/~hall/java/" target="_blank" rel="nofollow">http://www.apl.jhu.edu/~hall/java/</a>
 */
 
public class Browser extends JFrame implements HyperlinkListener, 
                                               ActionListener {
  public static void main(String[] args) {
    if (args.length == 0)
      new Browser("index.html");
    else
      new Browser(args[0]);
  }
 
  private JIconButton homeButton;
  private JTextField urlField;
  private JEditorPane htmlPane;
  private String initialURL;
 
  public Browser(String initialURL) {
    super("Simple Swing Browser");
    this.initialURL = initialURL;
    addWindowListener(new ExitListener());
    WindowUtilities.setNativeLookAndFeel();
 
    JPanel topPanel = new JPanel();
    topPanel.setBackground(Color.lightGray);
    homeButton = new JIconButton("home.gif");
    homeButton.addActionListener(this);
    JLabel urlLabel = new JLabel("URL:");
    urlField = new JTextField(30);
    urlField.setText(initialURL);
    urlField.addActionListener(this);
    topPanel.add(homeButton);
    topPanel.add(urlLabel);
    topPanel.add(urlField);
    getContentPane().add(topPanel, BorderLayout.NORTH);
 
    try {
        htmlPane = new JEditorPane(initialURL);
        htmlPane.setEditable(false);
        htmlPane.addHyperlinkListener(this);
        JScrollPane scrollPane = new JScrollPane(htmlPane);
        getContentPane().add(scrollPane, BorderLayout.CENTER);
    } catch(IOException ioe) {
       warnUser("Can't build HTML pane for " + initialURL 
                + ": " + ioe);
    }
 
    Dimension screenSize = getToolkit().getScreenSize();
    int width = screenSize.width * 8 / 10;
    int height = screenSize.height * 8 / 10;
    setBounds(width/8, height/8, width, height);
    setVisible(true);
  }
 
  public void actionPerformed(ActionEvent event) {
    String url;
    if (event.getSource() == urlField) 
      url = urlField.getText();
    else  // Clicked "home" button instead of entering URL
      url = initialURL;
    try {
      htmlPane.setPage(new URL(url));
      urlField.setText(url);
    } catch(IOException ioe) {
      warnUser("Can't follow link to " + url + ": " + ioe);
    }
  }
 
  public void hyperlinkUpdate(HyperlinkEvent event) {
    if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
      try {
        htmlPane.setPage(event.getURL());
        urlField.setText(event.getURL().toExternalForm());
      } catch(IOException ioe) {
        warnUser("Can't follow link to " 
                 + event.getURL().toExternalForm() + ": " + ioe);
      }
    }
  }
 
  private void warnUser(String message) {
    JOptionPane.showMessageDialog(this, message, "Error", 
                                  JOptionPane.ERROR_MESSAGE);
  }
}
    

I compiled it and it runs just fine.

My next steps are to:

1) put all 4 of the class files and about 4,000 HTML files into a JAR file. I tried to run jar -cf jarName.jar *.class to import the class files into my Jar, but it didn't work. I was able to get the class files into the Jar, but I guess it's having problems finding the "executoable" public static void main(String [] args)...


2) I want to use this code to launch index.html which will be inside of the Jar file.

3) from index.html, allow the user to navigate from one page in the JAR file to the next.

How can I do this?

Currently the line

  
      new Browser("index.html");

is not accepting index.html as the default html file name.

What do I have to point Browser() at?
[ January 26, 2005: Message edited by: Marcus Laubli ]

[Joe Ess]

The Browser constructor does not take a file name as an argument. It takes a URL.

[Damanjit Kaur]

1) I tried to run jar -cf jarName.jar *.class to import the class files into my Jar, but it didn't work.

use jar -cfm option to create jar file specifying all class files and create a manifest file.

having problems finding the "executoable" public static void main(String [] args)...

edit Manifest file to add another line

Main-Class: classname

the class which has main(..) method.

[Layne Lund]

To get a URL to a file within a JAR file, you can use ClassLoader.getSystemResource().

Layne