Java – Simple TextEditor


Using java to building a simple text editor application

– Create menu, contextual menu
– Using toolbox component
– Using JTextPane
– Understand JFileChooser, JColorChooser

You can down load source =>> here <<==

Video step by step ==>> at here <<==

Some app’s interface

 

Load all system font on font combobox

private void loadFont() {
GraphicsEnvironment gEnv = GraphicsEnvironment.getLocalGraphicsEnvironment();
// get all font name&amp;amp;amp;amp;amp;amp;amp;nbsp;
String[] fontNames = gEnv.getAvailableFontFamilyNames();
// load to combobox
ComboBoxModel model = new DefaultComboBoxModel(fontNames);
jcbFont.setModel(model);
}

When user select font and size, we will setting font and size for textpane component

private void jcbFontActionPerformed(java.awt.event.ActionEvent evt) {
// Change font of text
jTextPane1.setFont(new Font(jcbFont.getSelectedItem().toString(),
Font.PLAIN, Integer.parseInt(jcbSelectSize.getSelectedItem().toString())));
}

private void jcbSelectSizeActionPerformed(java.awt.event.ActionEvent evt) {
// Select size of text
String getSize = jcbSelectSize.getSelectedItem().toString();
Font f = jTextPane1.getFont();
// setting new size
jTextPane1.setFont(new Font(f.getFontName(),
f.getStyle(), Integer.parseInt(getSize)));
}

JColorChooser API of Java swing help our get a color from system color dialog, using code below for ActionPerformed event of color button.

private void btnSelectColorActionPerformed(java.awt.event.ActionEvent evt) {
Color jColor = selectColor;
// open color dialog and select Color
if ((jColor = JColorChooser.showDialog(this, "Select color", jColor)) != null) {
selectColor = jColor;
// set text color
jTextPane1.setForeground(selectColor);
}
}

RTFEditorKit can help reading formatted text on JTextPane and write down file system with rich text format

When user click on Save button or save as menu

private void save() {
JFileChooser file = new JFileChooser();
TextFilter filter = new TextFilter();
file.setFileFilter(filter);
String fileName = "";
// show save file dialog
if (file.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
// get full path of selected file
fileName = file.getSelectedFile().getAbsolutePath();
// get meta of text
StyledDocument doc = (StyledDocument) jTextPane1.getDocument();
// convert to richtext format
RTFEditorKit kit = new RTFEditorKit();
BufferedOutputStream out;
try {
out = new BufferedOutputStream(new FileOutputStream(fileName));
// save content to file
kit.write(out, doc, doc.getStartPosition().getOffset(), doc.getLength());
out.flush();
out.close();
} catch (Exception e) {
System.out.println("Err:" + e.toString());
}

} else {
return;
}
}

Handing button Open file or menu Open file as

private void open() {
JFileChooser file = new JFileChooser();
TextFilter filter = new TextFilter();
file.setFileFilter(filter);
String fileName = "";
// show open file dialog
if (file.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
fileName = file.getSelectedFile().getAbsolutePath();
} else {
return;
}
// using richtext format
RTFEditorKit rtf = new RTFEditorKit();
try {
// load file into jTextPane
FileInputStream fi = new FileInputStream(fileName);
rtf.read(fi, jTextPane1.getDocument(), 0);
fi.close();
} catch (Exception e) {
System.out.println("err:" + e.toString());
}
}

This is just demo java beginner.
I hope that, it is useful for you.