JavaFX，FXMLLoader.setController（控制器）不加載場景

Question

在setController上時保持凍結狀態。當用戶名和密碼是進入

import java.io.IOException; 
import java.sql.*; 
import javafx.collections.*; 
import javafx.event.Event; 
import javafx.fxml.*; 
import javafx.scene.Scene; 
import javafx.scene.control.*; 
import javafx.scene.layout.*; 
import javafx.stage.Stage; 

public class GiantsLoginController { 

public String dataName, serverName, password; 
public int num; 

private Connection connect = null; 
private Statement stmt = null; 

private boolean userPass, connected; 

private Connections connection; 


@FXML 
private ComboBox<String> sType; 
@FXML 
public TextField dbName; 
@FXML 
private TextField sName; 
@FXML 
private Button loginB; 
@FXML 
private PasswordField sPassword; 
@FXML 
private Pane paneL; 
@FXML 
private GridPane gPane; 
@FXML 
private ComboBox<String> uType; 


ObservableList<String> sLists = FXCollections.observableArrayList("MySQL LOCAL", 
     "MYSQL REMOTE", "SQL SERVER LOCAL", "SQL SERVER"); 
ObservableList<String> uList = FXCollections.observableArrayList("Player", 
     "Admin"); 



@FXML 
public void initialize() { 
    sType.setItems(sLists); 
    uType.setItems(uList); 
} 

@FXML 
public void loginBClick (Event event) { 
    if (isAllFieldFillup()) { 

     switch(uType.getValue().trim()) { 
      case "Admin": 
       if (connectCheck()) { 
        try { 

          changeStage(GiantsLogin.getPrimaryStage()); 

        } 
        catch (Exception e) { 

        } 
       } 
      case "Player": 
       if (connectCheck()) { 
        try { 

        } 
        catch (Exception e) { 

        } 
       } 
     } 
    } 
} 

public void changeStage(Stage stage) throws IOException { 
    GiantsAdminController controller = new GiantsAdminController("Hello World!"); 
    FXMLLoader loader = FXMLLoader.load(getClass().getResource("GiantsAdmin.fxml")); 
    loader.setController(controller); 
    stage.hide(); 
    stage.setScene(new Scene((Pane) loader.load())); 
    stage.show(); 
} 

public void closeConnection() { 

    if (connect != null) { 
     try { 
      stmt.close(); 
      connect.close(); 
     } 
     catch (SQLException e) { 

     } 
    } 
} 

public boolean connectCheck() { 
    connected = false; 

    dataName = dbName.getText(); 
    serverName = sName.getText(); 
    password = sPassword.getText(); 


    switch (sType.getValue()) { 
     case "MySQL LOCAL": 
      num = 1; 
      break; 
     case "MYSQL REMOTE": 
      num = 2; 
      break; 
     case "SQL SERVER LOCAL": 
      num = 3; 
      break; 
     case "SQL SERVER": 
      num = 4; 
      break; 
     default: 

    } 

    if (connect == null) { 
     connect = Connections.getconnect(num, dataName, serverName, password); 
    } 

    if (connect == null) { 
     System.out.println("Still no connection"); 
    } 

    if (stmt == null) { 
     try { 
      stmt = connect.createStatement(); 
      connected = true; 
     } catch (SQLException e) { 
      Alert notify = new Alert(Alert.AlertType.INFORMATION); 
      notify.setTitle("Blank filed"); 
      notify.setHeaderText(null); 
      notify.setContentText("Incorrect login."); 
      notify.showAndWait(); 

      connected = false; 
     } 


    } 
    return connected; 
} 

private boolean isAllFieldFillup() { 
    boolean allInfo; 
    if (sType.getValue().equals("server type") && dbName.getText().isEmpty() 
      && sName.getText().isEmpty() && sPassword.getText().isEmpty()) { 
     Alert notify = new Alert(Alert.AlertType.INFORMATION); 
     notify.setTitle("Blank filed"); 
     notify.setHeaderText(null); 
     notify.setContentText("You are missing some information."); 
     notify.showAndWait(); 

     allInfo = false; 
    } 
    else { 
     allInfo = true; 
    } 
    return allInfo; 
} 

} 

這是我打開一個新的場景，設置我的控制器，這樣我就可以 能夠訪問它在新的場景這不加載場景。但是，當我將 用戶名和密碼並單擊登錄時，它一直凍結。

public void changeStage(Stage stage) throws IOException { 
    GiantsAdminController controller = new GiantsAdminController("Hello World!"); 
    FXMLLoader loader = FXMLLoader.load(getClass().getResource("GiantsAdmin.fxml")); 
    loader.setController(controller); 
    stage.hide(); 
    stage.setScene(new Scene((Pane) loader.load())); 
    stage.show(); 
} 

這是我打電話的changeStage方法這種方法

public void loginBClick (Event event) { 
    if (isAllFieldFillup()) { 

     switch(uType.getValue().trim()) { 
      case "Admin": 
       if (connectCheck()) { 
        try { 

          changeStage(GiantsLogin.getPrimaryStage()); 

        } 
        catch (Exception e) { 

        } 
       } 
      case "Player": 
       if (connectCheck()) { 
        try { 

        } 
        catch (Exception e) { 

        } 
       } 
     } 
    } 
} 

這是我的主類

import java.io.IOException; 
import javafx.application.Application; 
import javafx.fxml.FXMLLoader; 
import javafx.scene.*; 

public class GiantsLogin extends Application { 

private static Stage stage; 

@Override 
public void start(Stage stage) throws IOException { 
    setPrimaryStage(stage); 
    Parent root = FXMLLoader.load(getClass().getResource("GiantsLogin.fxml")); 
    Scene scene = new Scene(root); 
    scene.getStylesheets().add(getClass().getResource("style.css").toExternalForm()); 
    stage.setScene(scene); 
    stage.setTitle("Giants Login"); 
    stage.show(); 
} 

public static void setPrimaryStage(Stage primaryStage) { 
    stage = primaryStage; 
} 

public static Stage getPrimaryStage() { 
    return stage; 
} 
public static void main(String[] args) { 
    launch(args); 
} 

} 

這是我的第二個窗口：這是應該的窗口當用戶名和密碼正確時打開 。

import java.io.IOException; 
import java.sql.Statement; 
import javafx.collections.*; 
import javafx.event.Event; 
import javafx.fxml.*; 
import javafx.scene.Node; 
import javafx.scene.Parent; 
import javafx.scene.Scene; 
import javafx.scene.control.*; 
import javafx.stage.Stage; 

public class GiantsAdminController { 
@FXML 
private Button connect = null; 
private boolean connected; 

private Statement stmt; 

@FXML 
private TextField aRank; 

public GiantsAdminController(String message) { 
    System.out.println("You said: " + message); 
} 

public GiantsAdminController() { 
} 

ObservableList<String> sLists = FXCollections.observableArrayList("MySQL LOCAL", 
     "MYSQL REMOTE", "SQL SERVER LOCAL", "SQL SERVER"); 
@FXML 
public void initialize() { 
    serverType.setItems(sLists); 
} 

@FXML 
public void clearBClick (Event event) { 
    aRank.clear(); 
    aName.clear(); 
    aPosition.clear(); 
    aSchool.clear(); 
    aAge.clear(); 
    aWar.clear(); 
} 


@FXML 
public void SingOutClick(Event event) throws IOException { 

    Parent giantsLogin = FXMLLoader.load(getClass().getResource("/giants/GiantsLogin.fxml")); 

    Scene gLScene = new Scene(giantsLogin); 
    gLScene.getStylesheets().add(getClass().getResource("style.css").toExternalForm()); 
    stage.setScene(gLScene); 
    stage.show(); 
} 
} 

我必須想盡辦法解決這個問題，但沒有運氣。

Answer 1

我認爲問題是在FXMLLoader上使用靜態加載函數。 嘗試此修改（未測試）。

public void changeStage(Stage stage) throws IOException { 
    GiantsAdminController controller = new GiantsAdminController("Hello World!"); 
    FXMLLoader loader = new FXMLLoader(getClass().getResource("GiantsAdmin.fxml")); 
    loader.setController(controller); 
    stage.hide(); 
    stage.setScene(new Scene((Pane) loader.load())); 
    stage.show(); 
}