获取登录用户JavaFX和MySQL

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

import java.sql.*;

public class LoginApp extends Application {

    private static final String DB_URL = "jdbc:mysql://localhost:3306/mydatabase";
    private static final String DB_USER = "username";
    private static final String DB_PASSWORD = "password";

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Login");

        GridPane grid = new GridPane();
        grid.setPadding(new Insets(10, 10, 10, 10));
        grid.setVgap(5);
        grid.setHgap(5);

        Label usernameLabel = new Label("Username:");
        GridPane.setConstraints(usernameLabel, 0, 0);
        TextField usernameInput = new TextField();
        GridPane.setConstraints(usernameInput, 1, 0);

        Label passwordLabel = new Label("Password:");
        GridPane.setConstraints(passwordLabel, 0, 1);
        PasswordField passwordInput = new PasswordField();
        GridPane.setConstraints(passwordInput, 1, 1);

        Button loginButton = new Button("Login");
        GridPane.setConstraints(loginButton, 1, 2);

        Label resultLabel = new Label();
        GridPane.setConstraints(resultLabel, 0, 3, 2, 1);

        grid.getChildren().addAll(usernameLabel, usernameInput, passwordLabel, passwordInput, loginButton, resultLabel);

        loginButton.setOnAction(event -> {
            String username = usernameInput.getText();
            String password = passwordInput.getText();

            if (validateLogin(username, password)) {
                resultLabel.setText("Login successful");
            } else {
                resultLabel.setText("Login failed");
            }
        });

        Scene scene = new Scene(grid, 300, 200);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private boolean validateLogin(String username, String password) {
        try (Connection connection = DriverManager.getConnection(DB_URL, DB_USER, DB_PASSWORD);
             PreparedStatement statement = connection.prepareStatement("SELECT * FROM users WHERE username = ? AND password = ?")) {

            statement.setString(1, username);
            statement.setString(2, password);

            try (ResultSet resultSet = statement.executeQuery()) {
                return resultSet.next();
            }
        } catch (SQLException e) {
            e.printStackTrace();
            return false;
        }
    }
}