HTMLDocument problems

Question

When I select a pice of text and click on "Format" then there are more characters formatted then there have been selected. Why?
And when I click on "Save" with just using the text that appears when starting the program then this text is not outputted to HTML. Why is that?
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.BadLocationException;
import javax.swing.text.MutableAttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.html.CSS;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLEditorKit;
import javax.swing.text.html.StyleSheet;
public class AdditionalText extends JFrame implements ActionListener {
     private static final int FRAME_WIDTH = 640;
     private static final int FRAME_HEIGHT = 480;
     private static final String FONT_FAMILY = "Courier New";
     private static final String FONT_SIZE = "24";
     private JButton leftAlign;
     private JButton centerAlign;
     private JButton rightAlign;
     private JTextPane editor;
     private JButton save;
     private JButton dump;
     private JButton format;
     public AdditionalText() {
          setTitle("Test Frame");
          JPanel topToolbar = new JPanel();
          leftAlign = new JButton("Left");
          centerAlign = new JButton("Center");
          rightAlign = new JButton("Right");
          ActionListener alignLeft = new HTMLEditorKit.AlignmentAction("alignLeft", 0);
          ActionListener alignCenter = new HTMLEditorKit.AlignmentAction("alignCenter", 1);
          ActionListener alignRight = new HTMLEditorKit.AlignmentAction("alignRight", 2);
          leftAlign.addActionListener(alignLeft);
          centerAlign.addActionListener(alignCenter);
          rightAlign.addActionListener(alignRight);
          topToolbar.add(leftAlign);
          topToolbar.add(centerAlign);
          topToolbar.add(rightAlign);
          editor = createEditor();
          JPanel bottomToolbar = new JPanel();
          save = new JButton("Save");
          save.addActionListener(this);
          dump = new JButton("Dump");
          dump.addActionListener(this);
          format = new JButton("Format");
          format.addActionListener(this);
          bottomToolbar.add(save);
          bottomToolbar.add(dump);
          bottomToolbar.add(format);
          getContentPane().add(BorderLayout.NORTH, topToolbar);
          getContentPane().add(BorderLayout.CENTER, editor);
          getContentPane().add(BorderLayout.SOUTH, bottomToolbar);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
          setSize(new Dimension(FRAME_WIDTH, FRAME_HEIGHT));
          setLocation((screenSize.width - FRAME_WIDTH) / 2, (screenSize.height - FRAME_HEIGHT) / 2);
     private JTextPane createEditor() {
          JTextPane editor = new JTextPane() {
               public void paintComponent(Graphics g) {
                    Graphics2D g2 = (Graphics2D) g;
                    g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
                    super.paintComponent(g2);
          editor.setEditorKit(new HTMLEditorKit());
          HTMLDocument htmlDocument = (HTMLDocument) editor.getDocument();
          MutableAttributeSet attr = new SimpleAttributeSet();
          StyleSheet ss = htmlDocument.getStyleSheet();
          ss.addCSSAttribute(attr, CSS.Attribute.FONT_FAMILY, FONT_FAMILY);
          ss.addCSSAttribute(attr, CSS.Attribute.FONT_SIZE, FONT_SIZE);
          editor.setCharacterAttributes(attr, false);
          try {
               htmlDocument.insertString(0, "Sample Text 123 ����", attr);
          } catch (BadLocationException e) {
               e.printStackTrace();
          return editor;
     public void actionPerformed(ActionEvent e) {
          HTMLDocument htmlDocument = (HTMLDocument) editor.getDocument();
          if(e.getSource() == save) {
               HTMLEditorKit kit = (HTMLEditorKit)editor.getEditorKitForContentType("text/html");
               try {
                    kit.write(System.out, htmlDocument, 0, htmlDocument.getLength());
               } catch (IOException ex) {
                    ex.printStackTrace();
               } catch (BadLocationException ex) {
                    ex.printStackTrace();
          } else if(e.getSource() == dump) {
               htmlDocument.dump(System.err);
          } else if(e.getSource() == format) {
               HTMLDocument doc = (HTMLDocument) editor.getDocument();
               MutableAttributeSet attr = new SimpleAttributeSet();
               StyleSheet ss = htmlDocument.getStyleSheet();
               ss.addCSSAttribute(attr, CSS.Attribute.FONT_WEIGHT, "bold");
               ss.addCSSAttribute(attr, CSS.Attribute.COLOR, "red");
               int start = editor.getSelectionStart();
               int end = editor.getSelectionEnd();
               System.out.println("Start: " + start + "\tEnd: " + end);
               doc.setCharacterAttributes(start, end, attr, false);
     public static void main(String[] args) {
          try {
               UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
          } catch (ClassNotFoundException e) {
               e.printStackTrace();
          } catch (InstantiationException e) {
               e.printStackTrace();
          } catch (IllegalAccessException e) {
               e.printStackTrace();
          } catch (UnsupportedLookAndFeelException e) {
               e.printStackTrace();
          AdditionalText at = new AdditionalText();
          at.show();
}

Answer 1

Forget about the other question. I solved it in another thread.
This is now a very simple HTML editor which works (if someone is interested in it):
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.UIManager;
import javax.swing.text.AttributeSet;
import javax.swing.text.Element;
import javax.swing.text.MutableAttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.html.CSS;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLEditorKit;
import javax.swing.text.html.StyleSheet;
* Created on 13.04.2003
* @author anonymous
* @version 0.0.1
* This is a very simple HTML Editor.
* It's purpose is to enter text and format it, if needed.
* The editor supports exporting the text to HTML.
public class AdditionalText extends JFrame implements ActionListener {
     private static final int FRAME_WIDTH = 640;
     private static final int FRAME_HEIGHT = 480;
     private static final String FONT_FAMILY = "body {font-size: 18;}";
     private static final String FONT_SIZE = "body {font-family: monospaced;}";
     private static final String SAMPLE_TEXT = "sample Text 123 ����";
     private JTextPane editor;
     private JButton save;
     private JButton dump;
     private JButton formatText;
     private JButton clearFormatting;
      * Constructor for the <code>AdditionalText</code> editor.
      * Most GUI components are defined, initialized and assembled here.
     public AdditionalText() {
          setTitle("HTML Editor Demo");
          // Assemble the top toolbar:
          JPanel topToolbar = new JPanel();
          topToolbar.setLayout(new FlowLayout(FlowLayout.CENTER, 20, 10));
          JButton leftAlign = new JButton("Left");
          JButton centerAlign = new JButton("Center");
          JButton rightAlign = new JButton("Right");
          leftAlign.addActionListener(new HTMLEditorKit.AlignmentAction(null, 0));
          centerAlign.addActionListener(new HTMLEditorKit.AlignmentAction(null, 1));
          rightAlign.addActionListener(new HTMLEditorKit.AlignmentAction(null, 2));
          formatText = new JButton("Format Text");
          formatText.addActionListener(this);
          clearFormatting = new JButton("Clear Formatting");
          clearFormatting.addActionListener(this);
          topToolbar.add(leftAlign);
          topToolbar.add(centerAlign);
          topToolbar.add(rightAlign);
          topToolbar.add(formatText);
          topToolbar.add(clearFormatting);
          // Assemble the editor:
          editor = createEditor();
          JScrollPane editorScrollPane = new JScrollPane(editor);
          // Assemble the bottom toolbar:
          JPanel bottomToolbar = new JPanel();
          bottomToolbar.setLayout(new FlowLayout(FlowLayout.CENTER, 50, 10));
          save = new JButton("Save");
          save.addActionListener(this);
          dump = new JButton("Dump");
          dump.addActionListener(this);
          bottomToolbar.add(save);
          bottomToolbar.add(dump);
          // Add all the JPanels to the JFrame:
          Container container = getContentPane();
          container.add(BorderLayout.NORTH, topToolbar);
          container.add(BorderLayout.CENTER, editorScrollPane);
          container.add(BorderLayout.SOUTH, bottomToolbar);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          // Display the window on the center of the screen:
          Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
          setSize(new Dimension(FRAME_WIDTH, FRAME_HEIGHT));
          setLocation((screenSize.width - FRAME_WIDTH) / 2, (screenSize.height - FRAME_HEIGHT) / 2);
      * Creation and set up of an simple HTML editor.
      * @return the created editor.
     private JTextPane createEditor() {
          JTextPane editor = new JTextPane() {
               // Improve readability of the text inside the editor:
               public void paintComponent(Graphics g) {
                    Graphics2D g2 = (Graphics2D) g;
                    g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
                                             RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
                    super.paintComponent(g2);
          editor.setEditorKit(new SHTMLEditorKit());
          // Set the default style for the document:
          HTMLDocument htmlDocument = (HTMLDocument)editor.getDocument();
          MutableAttributeSet mutuableAttributeSet = new SimpleAttributeSet();
          StyleSheet styleSheet = htmlDocument.getStyleSheet();
          styleSheet.addRule(FONT_FAMILY);
          styleSheet.addRule(FONT_SIZE);
          // Insert a sample text into the editor for testing purpose:
          try {
               Element root = htmlDocument.getDefaultRootElement();
               Element element = root.getElement(0).getElement(0);
               htmlDocument.insertAfterEnd(element, "<p>" + SAMPLE_TEXT + "</p>");
          } catch (Exception e) {
               e.printStackTrace();
          return editor;
      * Handling the actions associated to the buttons "Save", "Dump", "Format Text"
      * and "Clear Formatting".
      * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
     public void actionPerformed(ActionEvent e) {
          HTMLDocument htmlDocument = (HTMLDocument) editor.getDocument();
          if (e.getSource() == save) {
               HTMLEditorKit kit = (HTMLEditorKit) editor.getEditorKitForContentType("text/html");
               try {
                    // Output the document object to HTML text:
                    kit.write(System.out, htmlDocument, 0, htmlDocument.getLength());
               } catch (Exception ex) {
                    ex.printStackTrace();
          } else if (e.getSource() == dump) {
               // Output the document object to a XML like text representation:
               htmlDocument.dump(System.err);
          } else if (e.getSource() == formatText) {
               // Apply formatting to the selected text:
               int start = editor.getSelectionStart();
               int end = editor.getSelectionEnd();
               MutableAttributeSet attr = new SimpleAttributeSet();
               StyleSheet ss = htmlDocument.getStyleSheet();
               ss.addCSSAttribute(attr, CSS.Attribute.FONT_WEIGHT, "bold");
               ss.addCSSAttribute(attr, CSS.Attribute.COLOR, "blue");
               htmlDocument.setCharacterAttributes(start, end - start, attr, false);
          } else if (e.getSource() == clearFormatting) {
               // Remove formatting of the selected text:
               int start = editor.getSelectionStart();
               int end = editor.getSelectionEnd();
               Element element = htmlDocument.getCharacterElement(start);
               AttributeSet attributeSet = element.getAttributes();
               StyleSheet styleSheet = htmlDocument.getStyleSheet();
               attributeSet = styleSheet.removeAttribute(attributeSet, CSS.Attribute.FONT_WEIGHT);
               attributeSet = styleSheet.removeAttribute(attributeSet, CSS.Attribute.COLOR);
               htmlDocument.setCharacterAttributes(start, end - start, attributeSet, true);
      * Method for executing the <code>AdditionalText</code> editor.
      * @param args no arguments needed
      * @throws Exception thrown if the system look & feel can't be set
     public static void main(String[] args) throws Exception {
          UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
          AdditionalText at = new AdditionalText();
          at.show();
          while(!at.editor.requestFocusInWindow());
          at.editor.setCaretPosition(AdditionalText.SAMPLE_TEXT.length());
}