HTML rendering in Java

Question

I am trying to create a help panel for the application I'm working on. A help file that has already been created using html technology, and I would like it to appear in the panel and show. All the code I saw shows how to display a site, for example. " http://google.com ". I want to display a file from my computer, for example. "File: // C: \ tutorial.html"

This is the code that I have, but it does not work.

import javax.swing.JEditorPane; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; import javax.swing.SwingUtilities; import java.awt.Color; import java.awt.Container; import java.io.IOException; import static java.lang.System.err; import static java.lang.System.out; final class TestHTMLRendering { // ------------------------------ CONSTANTS ------------------------------ /** * height of frame in pixels */ private static final int height = 1000; /** * width of frame in pixels */ private static final int width = 1000; private static final String RELEASE_DATE = "2007-10-04"; /** * title for frame */ private static final String TITLE_STRING = "HTML Rendering"; /** * URL of page we want to display */ private static final String URL = "file://C:\\print.html"; /** * program version */ private static final String VERSION_STRING = "1.0"; // --------------------------- main() method --------------------------- /** * Debugging harness for a JFrame * * @param args command line arguments are ignored. */ @SuppressWarnings( { "UnusedParameters" } ) public static void main( String args[] ) { // Invoke the run method on the Swing event dispatch thread // Sun now recommends you call ALL your GUI methods on the Swing // event thread, even the initial setup. // Could also use invokeAndWait and catch exceptions SwingUtilities.invokeLater( new Runnable() { /** * } fire up a JFrame on the Swing thread */ public void run() { out.println( "Starting" ); final JFrame jframe = new JFrame( TITLE_STRING + " " + VERSION_STRING ); Container contentPane = jframe.getContentPane(); jframe.setSize( width, height ); contentPane.setBackground( Color.YELLOW ); contentPane.setForeground( Color.BLUE ); jframe.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); try { out.println( "acquiring URL" ); JEditorPane jep = new JEditorPane( URL ); out.println( "URL acquired" ); JScrollPane jsp = new JScrollPane( jep, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED ); contentPane.add( jsp ); } catch ( IOException e ) { err.println( "can't find URL" ); contentPane.add( new JLabel( "can't find URL" ) ); } jframe.validate(); jframe.setVisible( true ); // Shows page, with HTML comments erroneously displayed. // The links are not clickable. } } ); }// end main }// end TestHTMLRendering 

Answer 1

You forgot to set the content type to JEditorPane.

 jep.setContentType("text/html"); 

Answer 2

Rendering HTML in Swing is problematic. Swing components have built-in HTML support, but it's not even HTML4. It is (limited!) HTML 3.2. If you use a different desktop API, you will have many more options.

• WebKit for SWT (version 0.6) for the Eclipse Standard Widget Tookit is a great option. As the name suggests, it plugs in the WebKit rendering engine (which includes Chrome and Safari) into SWT;

• The Netbeans platform may also have some options.

You can also watch the Flying Saucer , which:

XML / XHTML / CSS 2.1 Sender

(100% Java)

Answer 3

What @cletus says is true. If you want your current application to continue using a file-based URL, try installing:

 URL = "file:///C://print.html"