将多行JTextArea写入txt文件

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;

public class JTextAreaToTxt {
    public static void main(String[] args) {
        JFrame frame = new JFrame("将多行JTextArea写入txt文件");
        JTextArea textArea = new JTextArea(10, 30);
        frame.add(textArea);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        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, "文件已成功保存！");
            } catch (IOException e) {
                JOptionPane.showMessageDialog(frame, "文件保存失败！");
                e.printStackTrace();
            }
        }
    }
}