This is an example on how to create a simple GUI application that Loads, Edits and Saves a file in Java. You might find it useful if you wish to add such a functionality built into your app. For example if you have an application that handles Files, and you want to add a “Quick Edit” option.
Basically, to create this simple application, one should follow these steps:
- Create a new
JFrame. - Add a
Containerto it. - Add a JEditorPane
- Use the
setEditorKitfunction to theJEditorPaneand give as an argument a newHTMLEditorKitso that your editor can handle HTML formatted documents. - Use the classic file handling mechanisms like
FileReaderto open and read the file you want - Use
JTextComponent.readfunction in order to load the file on the screen. - Use
JButtoncomponents and bundle them with the main actions e.g load, save ,edit.
Let’s take a look at the code:
package com.javacodegeeks.snippets.desktop;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.text.JTextComponent;
import javax.swing.text.html.HTMLEditorKit;
public class Main {
public static void main(String args[]) {
final String inputFilePath = "C:/Users/nikos7/Desktop/output.txt";
JFrame jFrame = new JFrame("Load ,Edit and Save file");
Container content = jFrame.getContentPane();
final JEditorPane edPane = new JEditorPane();
JScrollPane sPne = new JScrollPane(edPane);
content.add(sPne, BorderLayout.CENTER);
edPane.setEditorKit(new HTMLEditorKit());
JPanel jPanel = new JPanel();
Action Load = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent event) {
try {
load(edPane, inputFilePath);
} catch (Exception e1) {
e1.printStackTrace();
}
}
};
Load.putValue(Action.NAME, "Load");
JButton loadButton = new JButton(Load);
jPanel.add(loadButton);
Action absActionSave = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent event) {
try {
save(edPane, inputFilePath);
} catch (Exception e1) {
e1.printStackTrace();
}
}
};
absActionSave.putValue(Action.NAME, "Save");
JButton jButton = new JButton(absActionSave);
jPanel.add(jButton);
Action absActionClear = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent event) {
edPane.setText("");
}
};
absActionClear.putValue(Action.NAME, "Clear");
JButton clearButton = new JButton(absActionClear);
jPanel.add(clearButton);
content.add(jPanel, BorderLayout.SOUTH);
jFrame.setSize(800, 600);
jFrame.setVisible(true);
}
public static void save(JTextComponent text, String inputFile) throws Exception {
FileWriter writer = null;
writer = new FileWriter(inputFile);
text.write(writer);
writer.close();
}
public static void load(JTextComponent text, String inputFile) throws Exception {
FileReader inputReader = null;
inputReader = new FileReader(inputFile);
text.read(inputReader, inputFile);
inputReader.close();
}
}
This was an example on how to create an application that Loads, Edits and Saves a file in Java.
