Simple texteditor with Java Swing

• Download demo - 46 KB

Using Java to Build a Simple Text Editor Application

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

Background

• Basic Java UI component
• Read/write file

Code

Load all system font on font combobox:

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

When user selects font and size, we will be 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 helps us 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 to Reading Formatted Text on JTextPane and Write Down File System with Rich Text Format

When user clicks 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());
}
}?

Points of Interest

This is just demo Java beginner.

Maybe, see step by step video ==>> here <<==