Why this code doesn't show the HTML file???

Question

I wrote this code for showing the HTML file ,which I have chosen it from my computer!and when I choose the HTML file in my computer like FAQ.html this error messages will be shown:

java.net.MalformedURLException: no protocol: FAQ.html
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at javax.swing.JEditorPane.setPage(Unknown Source)
at org.bihe.com1112.FileViewer.actionPerformed(FileViewer.java:86)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)





public class FileViewer extends JPanel implements ActionListener {

/**
 * 
 */
private static final long serialVersionUID = 1L;

JFileChooser chooser;

FileNameExtensionFilter filter = null;

JTextField text;

JButton button;

FileInputStream in;

JEditorPane pane;

public FileViewer(JEditorPane pane) {
 this.pane = pane;
 setLayout(new FlowLayout(FlowLayout.RIGHT));
 text = new JTextField("file...", 31);
 text.setColumns(45);
 text.revalidate();
 text.setEditable(true);

 button = new JButton("Browse");
 add(text);
 add(button);
 filter = new FileNameExtensionFilter("html", "html");
 chooser = new JFileChooser();
 chooser.addChoosableFileFilter(filter);

 button.addActionListener(this);

}

public void paintComponent(Graphics g) {
 super.paintComponents(g);
 Graphics2D graphic = (Graphics2D) g;
 graphic.drawString("HTML File:", 10, 20);

}

public void actionPerformed(ActionEvent event) {
 int returnVal = 0;
 if (event.getSource() == button) {
  returnVal = chooser.showOpenDialog(FileViewer.this);
  if (returnVal == JFileChooser.APPROVE_OPTION) {
   File file = chooser.getSelectedFile();
   text.setText(file.getName());
   if (file != null) {
    try {
     pane.setPage(file.getName());
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }

   } else

    System.err.println("Couldn't find this HTML file:"
      + file.getName());

  } else
   System.exit(0);
 }

  }
 }

Answer 1

You need to specify the full path of the file using the file protocol as such:

file:///c:/somefolder/FAQ.html

You can use file.toURI() to get an URI, and then uri.toURL() to get an URL:

// file.toURL() has been deprecated, use file.toURI().toURL() instead
pane.setPage(file.toURI().toURL());

Answer 2

Maybe try pane.setPage(file.toURL()) instead of pane.setPage(file.getName()), because setPage expects a url, judging from a quick search for others trying to get it to work, having not tried it myself.