如何将编辑好的文本文件保存到JTextArea中？

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class SaveFileToJTextArea {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Save File to JTextArea");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JTextArea textArea = new JTextArea();
        JButton saveButton = new JButton("Save");

        saveButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JFileChooser fileChooser = new JFileChooser();
                int result = fileChooser.showSaveDialog(frame);

                if (result == JFileChooser.APPROVE_OPTION) {
                    File file = fileChooser.getSelectedFile();
                    try {
                        FileWriter writer = new FileWriter(file);
                        writer.write(textArea.getText());
                        writer.close();
                        JOptionPane.showMessageDialog(frame, "File saved successfully.");
                    } catch (IOException ex) {
                        ex.printStackTrace();
                        JOptionPane.showMessageDialog(frame, "Failed to save file.");
                    }
                }
            }
        });

        frame.getContentPane().add(new JScrollPane(textArea));
        frame.getContentPane().add(saveButton, "South");
        frame.setSize(400, 300);
        frame.setVisible(true);
    }
}