Adding Highlight in JTextPane ?

Question

Hi All,
I have a interface where i can display a html page.
Now i want to highlight few text from the displayed page in any color.
Can anyone tell me how can do that ?
I am trying to make a demo of search where user enters some key words and i wanna highlight all the words in the page.
Is it possible ?
Hopeing for a favourable response.
Kind Regards
Chetan Chandarana

Answer 1

You might be able to use a Highlighter. Here is some code I copied from another thread that gives you an idea how to use a Highlighter.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.util.*;
public class HighlightTest
     public static void main(String[] arguments)
     JFrame f = new JFrame("3plus4 HLM test");
     JEditorPane e =
     new JEditorPane("text/plain", "hfhk shhdf kdsh kshfdsh fh fkshfhs fh fhf dhf hfhf hfd hfdf ");
     f.getContentPane().add(new JScrollPane(e));
     HLM h = new HLM(e);
     h.addHighlight(3, 5);
     h.addHighlight(9, 12);
     h.addHighlight(16, 22);
     f.pack();
     f.setSize(200, 200);
     f.show();
     static class HLM implements CaretListener
          static class HighlightInterval
               int p0, p1;
               Object tag;
               HighlightInterval(int p0, int p1, Object tag)
                    this.p0 = p0;
                    this.p1 = p1;
                    this.tag = tag;
               boolean contains(int dot)
                    return dot >= p0 && dot < p1;
          ArrayList highlights = new ArrayList();
          Highlighter h = new DefaultHighlighter();
          Highlighter.HighlightPainter p = new DefaultHighlighter.DefaultHighlightPainter(Color.yellow);
          HLM(JEditorPane editor)
               editor.setHighlighter(h);
               editor.addCaretListener(this);
          public void caretUpdate(CaretEvent e)
               for (Iterator i = highlights.iterator(); i.hasNext();)
                    HighlightInterval hi = (HighlightInterval) i.next();
                    if (hi.contains(e.getDot()))
                         h.removeHighlight(hi.tag);
                         i.remove();
                         break;
          public void addHighlight(int p0, int p1)
               try
                    Object tag = h.addHighlight(p0, p1, p);
                    highlights.add(new HighlightInterval(p0, p1, tag));
               catch (BadLocationException e)
                    e.printStackTrace();
}