不能在JavaFX控制器之间传递数据

Question

我试图在不同FXML场景的控制器之间传递数据。但是我不能将数据传递给另一个控制器。这是我的第一个控制器。

public class FXMLDocumentController {

Session session;

private static Stage myStage;

@FXML
private Button button;

@FXML
private TextField txtAd;

@FXML
private TextField txtSifre;

@FXML
void handleButtonAction(ActionEvent event) {

    session = NewHibernateUtil.getSessionFactory().openSession();
    Transaction tx = null;
    try {
        tx = session.beginTransaction();

        Query query = session.createQuery("from Userss where ad = :code and sifre = :sifre");
        query.setParameter("code", txtAd.getText().trim());
        query.setParameter("sifre", txtSifre.getText().trim());
        if (query.list().size() == 1) {

            Alert alert = new Alert(AlertType.INFORMATION);
            alert.setTitle("Giriş");
            alert.setHeaderText(null);
            String s = "This is an example of JavaFX 8 Dialogs... ";
            alert.setContentText(s);
            alert.showAndWait();

        }


        tx.commit();
    } catch (Exception e) {
        if (tx != null) {
            tx.rollback();
        }
    } finally {

        try {
            session.close();

            FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDevam.fxml"));
            DevamController devamController = loader.getController();
            devamController.as("aaaaaaaaaaaaaaaaaaaaa");
            AnchorPane login = (AnchorPane) loader.load();
            Scene scene = new Scene(login);

            myStage.setTitle("asd");
            myStage.setScene(scene);

        } catch (IOException ex) {
            Logger.getLogger(FXMLDocumentController.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

}

static void setStage(Stage stage) {
    myStage = stage;
}

}

这是第二个控制器。

 public class DevamController implements Initializable {

String as ;


@FXML
private Label lblAd;

@Override
public void initialize(URL url, ResourceBundle rb) {
    // TODO

    lblAd.setText(as);
}    

public void as (String a){
   as = a;
}

}

 devamController.as("aaaaaaaaaaaaaaaaaaaaa");

Answer 1

控制器是从FXML文件加载的（因为它是在FXML文件中定义的，使用fx:controller)，所以在使用loader.load()加载FXML之前，它将为空。只需切换顺序：

        FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDevam.fxml"));
        AnchorPane login = (AnchorPane) loader.load();
        DevamController devamController = loader.getController();
        devamController.as("aaaaaaaaaaaaaaaaaaaaa");

您需要更新as()方法中的标签，因为已经执行了initialize()。