java swing组件文本编辑器

以下是一个使用Java Swing组件开发的简单文本编辑器的示例：

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

public class TextEditor extends JFrame {
    private JTextArea textArea;
    private JMenuBar menuBar;
    private JMenu fileMenu;
    private JMenuItem openMenuItem;
    private JMenuItem saveMenuItem;
    private JMenuItem exitMenuItem;

    public TextEditor() {
        setTitle("Java Swing Text Editor");
        setSize(500, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        textArea = new JTextArea();
        JScrollPane scrollPane = new JScrollPane(textArea);
        add(scrollPane, BorderLayout.CENTER);

        menuBar = new JMenuBar();
        fileMenu = new JMenu("File");
        openMenuItem = new JMenuItem("Open");
        saveMenuItem = new JMenuItem("Save");
        exitMenuItem = new JMenuItem("Exit");

        openMenuItem.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JFileChooser fileChooser = new JFileChooser();
                int option = fileChooser.showOpenDialog(TextEditor.this);
                if (option == JFileChooser.APPROVE_OPTION) {
                    File file = fileChooser.getSelectedFile();
                    try {
                        BufferedReader reader = new BufferedReader(new FileReader(file));
                        StringBuilder sb = new StringBuilder();
                        String line;
                        while ((line = reader.readLine()) != null) {
                            sb.append(line).append("\n");
                        }
                        reader.close();
                        textArea.setText(sb.toString());
                    } catch (IOException ex) {
                        ex.printStackTrace();
                    }
                }
            }
        });

        saveMenuItem.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JFileChooser fileChooser = new JFileChooser();
                int option = fileChooser.showSaveDialog(TextEditor.this);
                if (option == JFileChooser.APPROVE_OPTION) {
                    File file = fileChooser.getSelectedFile();
                    try {
                        BufferedWriter writer = new BufferedWriter(new FileWriter(file));
                        writer.write(textArea.getText());
                        writer.close();
                    } catch (IOException ex) {
                        ex.printStackTrace();
                    }
                }
            }
        });

        exitMenuItem.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });

        fileMenu.add(openMenuItem);
        fileMenu.add(saveMenuItem);
        fileMenu.add(exitMenuItem);
        menuBar.add(fileMenu);
        setJMenuBar(menuBar);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                TextEditor textEditor = new TextEditor();
                textEditor.setVisible(true);
            }
        });
    }
}

这个文本编辑器使用了Java Swing的各种组件，包括JFrame、JTextArea、JScrollPane、JMenuBar、JMenu和JMenuItem等。它具有菜单栏，可以打开和保存文件，并且可以编辑文本内容。