HTMLEditor

Question

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();     }     }
This code works, it is a small html editor:the problem is that if I write a line like this:
"Urgent:
buy the medicine"
the final html code return this line:
"Urgent:
buy the medicine".
It doesn't accept spaces and the use of Tab.
How can I make it accept them????
thank you.

Answer 1

This is the code written in a better way:
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;
import javax.swing.Action;
* 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 JPanel 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: 13pt;}";
private static final String FONT_SIZE = "body {font-family: garamond;}";
private JTextPane editor;
private JButton save;
private JButton dump;
private JButton bold;
private JButton indent;
private JButton italic;
private JButton indent2;
private JButton underlined;
private JButton clearFormatting;
private Paziente paz;
private String iePath;
* Constructor for the <code>AdditionalText</code> editor.
* Most GUI components are defined, initialized and assembled here.
public AdditionalText(Paziente paz, String iePath) {
setName("HTML Editor Demo");
this.paz = paz;
this.iePath = iePath;
// 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));
bold = new JButton("Bold");
indent = new JButton("Indent");
italic = new JButton("Italic");
underlined = new JButton("Underlined");
bold.addActionListener(this);
indent.addActionListener(this);
italic.addActionListener(this);
underlined.addActionListener(this);
clearFormatting = new JButton("Clear Formatting");
clearFormatting.addActionListener(this);
topToolbar.add(leftAlign);
topToolbar.add(centerAlign);
topToolbar.add(rightAlign);
topToolbar.add(bold);
topToolbar.add(indent);
topToolbar.add(italic);
topToolbar.add(underlined);
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);
this.setLayout(new BorderLayout());
this.add(topToolbar, BorderLayout.NORTH);
this.add(editorScrollPane, BorderLayout.CENTER);
this.add(bottomToolbar, BorderLayout.SOUTH);
// 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 HTMLEditorKit());
// 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>esempio</p>");//SAMPLE_TEXT1+SAMPLE_TEXT2+SAMPLE_TEXT3);
} 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() == bold) {
// 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() == indent) {
// 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.MARGIN_LEFT, "3em");
htmlDocument.setCharacterAttributes(start, end - start, attr, false);
} else if (e.getSource() == underlined) {
// 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.TEXT_DECORATION, "underline");
htmlDocument.setCharacterAttributes(start, end - start, attr, false);
} else if (e.getSource() == italic) {
// 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_STYLE, "italic");
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);