Java SE (Java Platform, Standard Edition)

package com.textpane.gui;

import java.awt.event.*;
import java.awt.*;

import javax.swing.*;
import javax.swing.text.*;
import javax.swing.text.html.*;

public class JTextPaneApp
extends JFrame
{
    public final static int APP_WIDTH = 640;
    public final static int APP_HEIGHT = 400;

    public JTextPane jTextPane;
    public StyleSheet styleSheet;
    public HTMLDocument htmlDocument;
    public HTMLEditorKit htmlEditorKit;

    public javax.swing.text.Element contentElement;

    public JTextPaneApp()
    {
        setSize(APP_WIDTH, APP_HEIGHT);
        setResizable(false);
        setTitle("JTextPane App");

        styleSheet = new StyleSheet();
        styleSheet.addRule("body {font-family: Tahoma; font-size: 11pt; font-style: normal; font-weight: normal;}");
        styleSheet.addRule(".nick {color: blue;}");
        styleSheet.addRule(".normal {color: black;}");

        htmlEditorKit = new HTMLEditorKit();
        htmlEditorKit.setStyleSheet(styleSheet);
        htmlDocument = (HTMLDocument)htmlEditorKit.createDefaultDocument();

        jTextPane = new JTextPane();
        jTextPane.setEditorKit(htmlEditorKit);
        jTextPane.setDocument(htmlDocument);

        try {
            javax.swing.text.Element htmlElement = htmlDocument.getRootElements()[0];
            javax.swing.text.Element bodyElement = htmlElement.getElement(0);
            htmlDocument.insertAfterStart(bodyElement, "<div></div>");

            contentElement = bodyElement.getElement(0);
        } catch (Exception e) {
            e.printStackTrace();
        }


        Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());

        contentPane.add(jTextPane, BorderLayout.CENTER);

        addWindowListener
        (
            new WindowAdapter()
            {
                public void windowClosing(WindowEvent e)
                {
                    System.exit(0);
                }
            }
        );

        StringBuffer sbHtml = new StringBuffer();
        sbHtml.append("<div>");
        sbHtml.append("<font class=\"nick\">").append("Peter said: ").append("</font>");
        sbHtml.append("<font class=\"normal\">").append("Hello, world!").append("</font>");
        sbHtml.append("</div>");

        try {
            htmlDocument.insertBeforeEnd(contentElement, sbHtml.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args)
    {
        try {
            JTextPaneApp jTextPaneApp = new JTextPaneApp();
            jTextPaneApp.setVisible(true);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}