如何使用MySQL和Java实现一个简单的订阅功能

private TextField emailField;
private ComboBox<String> contentComboBox;

@Override
public void start(Stage primaryStage) {
    Label emailLabel = new Label("Email:");
    emailField = new TextField();

    Label contentLabel = new Label("Content:");
    contentComboBox = new ComboBox<>();
    contentComboBox.getItems().addAll("Content 1", "Content 2", "Content 3");

    Button subscribeButton = new Button("Subscribe");
    subscribeButton.setOnAction(e -> subscribe());

    VBox vBox = new VBox(10, emailLabel, emailField, contentLabel, contentComboBox, subscribeButton);
    vBox.setAlignment(Pos.CENTER);
    vBox.setPadding(new Insets(10));

    primaryStage.setTitle("Subscription App");
    primaryStage.setScene(new Scene(vBox, 300, 200));
    primaryStage.show();
}

private void subscribe() {
    String email = emailField.getText();
    String content = contentComboBox.getSelectionModel().getSelectedItem();

    // 在这里编写订阅的逻辑，将用户的订阅信息保存到数据库中

    System.out.println("Subscribed: " + email + " to " + content);
}

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

public void subscribe(String email, String content) {
    try (Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/subscription_db", "username", "passWord")) {
        String sql = "INSERT INTO users (email, subscribe_to) VALUES (?, ?)";
        PreparedStatement statement = conn.prepareStatement(sql);
        statement.setString(1, email);
        statement.setString(2, content);
        statement.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

public static void main(String[] args) {
    SubscriptionService service = new SubscriptionService();
    service.subscribe("example@email.com", "Content 1");
}