用java Swing写一个登录注册界面，使用MVC架构，操作数据以json形式储存

好的，我可以为您提供一个基本的登录注册界面的代码框架，使用MVC架构，数据以JSON形式储存。以下是代码：

Model类：

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class User {

    private String username;
    private String password;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }

    public static User fromJson(String json) {
        // 将 JSON 字符串转换成 User 对象
        return new Gson().fromJson(json, User.class);
    }

    public String toJson() {
        // 将 User 对象转换成 JSON 字符串
        return new Gson().toJson(this);
    }

    public static List<User> getUsers() {
        // 从文件中读取所有用户数据
        String json = FileUtil.readFromFile("users.json");
        if (json == null) {
            return new ArrayList<>();
        }
        Type listType = new TypeToken<ArrayList<User>>(){}.getType();
        return new Gson().fromJson(json, listType);
    }

    public static void saveUsers(List<User> users) {
        // 将所有用户数据保存到文件中
        String json = new Gson().toJson(users);
        FileUtil.writeToFile("users.json", json);
    }

    public static User getUserByUsername(String username) {
        // 根据用户名查找用户
        List<User> users = getUsers();
        List<User> filteredUsers = users.stream()
                .filter(user -> user.getUsername().equals(username))
                .collect(Collectors.toList());
        if (filteredUsers.isEmpty()) {
            return null;
        }
        return filteredUsers.get(0);
    }

}

View类：

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

public class LoginView extends JFrame {

    private JTextField usernameField;
    private JPasswordField passwordField;
    private JButton loginButton;
    private JButton registerButton;

    public LoginView() {
        setTitle("Login");
        setSize(300, 200);
        setDefaultCloseOperation(EXIT_ON_CLOSE);

        JPanel panel = new JPanel(new GridLayout(3, 2));

        panel.add(new JLabel("Username:"));
        usernameField = new JTextField();
        panel.add(usernameField);

        panel.add(new JLabel("Password:"));
        passwordField = new JPasswordField();
        panel.add(passwordField);

        loginButton = new JButton("Login");
        panel.add(loginButton);

        registerButton = new JButton("Register");
        panel.add(registerButton);

        add(panel);

        setLocationRelativeTo(null);
        setVisible(true);
    }

    public String getUsername() {
        return usernameField.getText();
    }

    public String getPassword() {
        return new String(passwordField.getPassword());
    }

    public void showError(String message) {
        JOptionPane.showMessageDialog(this, message, "Error", JOptionPane.ERROR_MESSAGE);
    }

    public void addLoginListener(ActionListener listener) {
        loginButton.addActionListener(listener);
    }

    public void addRegisterListener(ActionListener listener) {
        registerButton.addActionListener(listener);
    }

}

Controller类：

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.List;

public class LoginController {

    private LoginView view;

    public LoginController(LoginView view) {
        this.view = view;

        view.addLoginListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String username = view.getUsername();
                String password = view.getPassword();
                User user = User.getUserByUsername(username);
                if (user == null) {
                    view.showError("Invalid username or password!");
                    return;
                }
                if (!user.getPassword().equals(password)) {
                    view.showError("Invalid username or password!");
                    return;
                }
                JOptionPane.showMessageDialog(view, "Login succeeded!");
            }
        });

        view.addRegisterListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String username = view.getUsername();
                String password = view.getPassword();
                User user = User.getUserByUsername(username);
                if (user != null) {
                    view.showError("Username already exists!");
                    return;
                }
                List<User> users = User.getUsers();
                users.add(new User(username, password));
                User.saveUsers(users);
                JOptionPane.showMessageDialog(view, "Registration succeeded!");
            }
        });
    }

}

启动类：

public class Main {

    public static void main(String[] args) {
        LoginView view = new LoginView();
        LoginController controller = new LoginController(view);
    }

}

注意：这个示例代码只提供了一个基本的登录注册界面，还需要您自己进行完善和优化。同时，还需要自己实现文件操作的FileUtil工具类。