用java swing写一个登录注册忘记密码界面，要求使用mvc架构，并使用json储存文件

好的，我会尽力回答你的问题。

首先，MVC架构是一种常见的软件设计模式，它将应用程序分为三个主要组成部分：模型（Model）、视图（View）和控制器（Controller）。其中，模型表示应用程序的数据和业务逻辑，视图表示用户界面，控制器则负责协调模型和视图之间的交互。下面，我会利用MVC架构来设计一个简单的登录注册忘记密码界面，并使用JSON文件来存储用户信息。

1. 模型（Model）：

我们需要设计一个User类来表示用户，包含用户的用户名、密码、邮箱等信息。同时，我们需要设计一个UserManager类来管理用户信息，包括用户的注册、登录、修改密码等操作。在这里，我们可以使用JSON文件来保存用户信息，每个用户对应一个JSON对象。下面是相关代码：

public class User {
    private String username;
    private String password;
    private String email;

    // getters and setters

    public String toJson() {
        JSONObject json = new JSONObject();
        json.put("username", username);
        json.put("password", password);
        json.put("email", email);
        return json.toString();
    }

    public static User fromJson(String jsonString) {
        JSONObject json = new JSONObject(jsonString);
        User user = new User();
        user.setUsername(json.getString("username"));
        user.setPassword(json.getString("password"));
        user.setEmail(json.getString("email"));
        return user;
    }
}

public class UserManager {
    private final String USER_FILE = "users.json";
    private List<User> userList;

    public UserManager() {
        userList = new ArrayList<>();
        loadUsers();
    }

    public boolean register(User user) {
        if (getUserByUsername(user.getUsername()) != null) {
            return false;
        }
        userList.add(user);
        saveUsers();
        return true;
    }

    public User login(String username, String password) {
        User user = getUserByUsername(username);
        if (user != null && user.getPassword().equals(password)) {
            return user;
        }
        return null;
    }

    public boolean changePassword(String username, String oldPassword, String newPassword) {
        User user = login(username, oldPassword);
        if (user != null) {
            user.setPassword(newPassword);
            saveUsers();
            return true;
        }
        return false;
    }

    private User getUserByUsername(String username) {
        for (User user : userList) {
            if (user.getUsername().equals(username)) {
                return user;
            }
        }
        return null;
    }

    private void loadUsers() {
        try (FileReader reader = new FileReader(USER_FILE)) {
            JSONTokener tokener = new JSONTokener(reader);
            JSONArray jsonArray = new JSONArray(tokener);
            for (int i = 0; i < jsonArray.length(); i++) {
                String jsonString = jsonArray.getString(i);
                User user = User.fromJson(jsonString);
                userList.add(user);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void saveUsers() {
        JSONArray jsonArray = new JSONArray();
        for (User user : userList) {
            jsonArray.put(user.toJson());
        }
        try (FileWriter writer = new FileWriter(USER_FILE)) {
            writer.write(jsonArray.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2. 视图（View）：

我们需要设计一个GUI界面来实现登录、注册、修改密码等功能。在这里，我们可以使用Swing框架来构建GUI界面。下面是相关代码：

public class LoginFrame extends JFrame {
    private JTextField usernameField;
    private JPasswordField passwordField;

    public LoginFrame() {
        setTitle("Login");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 200);
        setLocationRelativeTo(null);

        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);

        JButton loginButton = new JButton("Login");
        loginButton.addActionListener(e -> {
            String username = usernameField.getText();
            String password = new String(passwordField.getPassword());
            User user = userManager.login(username, password);
            if (user != null) {
                JOptionPane.showMessageDialog(LoginFrame.this, "Login success");
                // TODO: do something
            } else {
                JOptionPane.showMessageDialog(LoginFrame.this, "Login failed");
                passwordField.setText("");
            }
        });
        panel.add(loginButton);

        JButton registerButton = new JButton("Register");
        registerButton.addActionListener(e -> {
            RegisterFrame registerFrame = new RegisterFrame();
            registerFrame.setVisible(true);
        });
        panel.add(registerButton);

        getContentPane().add(panel);
    }
}

public class RegisterFrame extends JFrame {
    private JTextField usernameField;
    private JPasswordField passwordField;
    private JTextField emailField;

    public RegisterFrame() {
        setTitle("Register");
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        setSize(300, 250);
        setLocationRelativeTo(null);

        JPanel panel = new JPanel(new GridLayout(4, 2));

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

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

        panel.add(new JLabel("Email:"));
        emailField = new JTextField();
        panel.add(emailField);

        JButton registerButton = new JButton("Register");
        registerButton.addActionListener(e -> {
            String username = usernameField.getText();
            String password = new String(passwordField.getPassword());
            String email = emailField.getText();
            User user = new User();
            user.setUsername(username);
            user.setPassword(password);
            user.setEmail(email);
            if (userManager.register(user)) {
                JOptionPane.showMessageDialog(RegisterFrame.this, "Register success");
                dispose();
            } else {
                JOptionPane.showMessageDialog(RegisterFrame.this, "Register failed");
                usernameField.setText("");
                passwordField.setText("");
                emailField.setText("");
            }
        });
        panel.add(registerButton);

        getContentPane().add(panel);
    }
}

public class ChangePasswordFrame extends JFrame {
    private JTextField usernameField;
    private JPasswordField oldPasswordField;
    private JPasswordField newPasswordField;

    public ChangePasswordFrame() {
        setTitle("Change Password");
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        setSize(300, 250);
        setLocationRelativeTo(null);

        JPanel panel = new JPanel(new GridLayout(4, 2));

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

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

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

        JButton changeButton = new JButton("Change");
        changeButton.addActionListener(e -> {
            String username = usernameField.getText();
            String oldPassword = new String(oldPasswordField.getPassword());
            String newPassword = new String(newPasswordField.getPassword());
            if (userManager.changePassword(username, oldPassword, newPassword)) {
                JOptionPane.showMessageDialog(ChangePasswordFrame.this, "Change password success");
                dispose();
            } else {
                JOptionPane.showMessageDialog(ChangePasswordFrame.this, "Change password failed");
                oldPasswordField.setText("");
                newPasswordField.setText("");
            }
        });
        panel.add(changeButton);

        getContentPane().add(panel);
    }
}

3. 控制器（Controller）：

我们需要设计一个主控制器来协调模型和视图之间的交互。在这里，我们可以使用Java事件机制来实现控制器。下面是相关代码：

public class MainController {
    private LoginFrame loginFrame;
    private UserManager userManager;

    public MainController() {
        userManager = new UserManager();
        loginFrame = new LoginFrame();
        loginFrame.setVisible(true);
        loginFrame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosed(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}

最后，我们只需要在main函数中创建MainController对象即可启动程序。下面是相关代码：

public class Main {
    public static void main(String[] args) {
        MainController controller = new MainController();
    }
}

好的，以上就是用Java Swing写一个登录注册忘记密码界面并使用MVC架构和JSON文件的全部内容。希望能够对你有所帮助！