JavaFX - 값을 전달하는 중

Question

이 문제는 매우 흔한 일이지만, 옵션이 부족합니다. 모든 해결책을 시도했지만 아무것도 나를 위해 일하고 있지 않습니다.

내가하려는 것은 단순히 1 JFX 창에서 다른 값으로 전달하는 것입니다.

여기 여기

public void login(ActionEvent event){ 
    try{ 
     if(loginModel.isLogin(txtUsername.getText(), txtPassword.getText())){ 
      try { 
       ((Node)event.getSource()).getScene().getWindow().hide(); 
       Stage primaryStage = new Stage(); 
       FXMLLoader loader = new FXMLLoader(); 
       mainViewController sendHello = loader.<mainViewController>getController(); 
       sendHello.getUser(txtUsername.getText()); 
       Pane root = loader.load(getClass().getResource("mainView.fxml").openStream()); 
       primaryStage.setTitle("Kcalculator"); 
       primaryStage.setScene(new Scene(root)); 
       primaryStage.setResizable(false); 
       primaryStage.show(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } else{ 
      Alert alert1 = new Alert(Alert.AlertType.INFORMATION); 
      alert1.setTitle("Login failed"); 
      alert1.setHeaderText(null); 
      alert1.setContentText("The username or password you have entered is invalid."); 
      alert1.showAndWait(); 
     } 
    } catch (SQLException e) { 
     e.printStackTrace(); 
    } 
} 

하고, 임은 여전히 ​​"성공적인"로그인 후 NullPointerException이 점점 몇 가지 솔루션을 시도 후 내 mainViewController 클래스

public class mainViewController implements Initializable{ 

    @FXML 
    private Label userLbl = new Label(); 

    public void getUser(String user){ 
     userLbl.setText("Welcome " + user); 
    } 

    @Override 
    public void initialize(URL location, ResourceBundle resources) { 

    } 
} 

입니다 loginController 클래스 안에 내 login 방법이다. fx:controller 속성은 물론이 작업을 수행하려면 올바른 값을 할당 할 필요가

FXMLLoader loader = new FXMLLoader(); 

// load fxml 
Pane root = loader.load(getClass().getResource("mainView.fxml").openStream()); 

// get controller created using fx:controller attribute in the fxml 
mainViewController sendHello = loader.<mainViewController>getController(); 

// use controller 
sendHello.getUser(txtUsername.getText()); 

참고 : loader.getController이 null 이외의 아무것도 반환하기 전에

Answer 1

당신은 fxml를로드해야합니다.

Answer 2

최근에 앱 로그인을 개발해야했습니다. 이 앱은 사용자 계정 유형에 대한 적절한보기를 엽니 다. sqlite를 사용하여 사용자에 대한 정보를 저장 및 검색하고 암호화 된 암호를 저장 및 검색합니다. 도움이 될 것입니다.

컨트롤러

import java.io.IOException; 
import java.net.URL; 
import java.security.NoSuchAlgorithmException; 
import java.security.SecureRandom; 
import java.security.spec.InvalidKeySpecException; 
import java.security.spec.KeySpec; 
import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.PreparedStatement; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.util.Arrays; 
import java.util.ResourceBundle; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import javafx.event.ActionEvent; 
import javafx.fxml.FXML; 
import javafx.fxml.FXMLLoader; 
import javafx.fxml.Initializable; 
import javafx.scene.Node; 
import javafx.scene.Parent; 
import javafx.scene.Scene; 
import javafx.scene.control.Alert; 
import javafx.scene.control.Button; 
import javafx.scene.control.PasswordField; 
import javafx.scene.control.TextField; 
import javafx.scene.input.KeyCode; 
import javafx.scene.input.KeyEvent; 
import javafx.stage.Stage; 
import javax.crypto.SecretKeyFactory; 
import javax.crypto.spec.PBEKeySpec; 

public class FXMLDocumentController implements Initializable { 

    @FXML private TextField tfUsername; 
    @FXML private PasswordField pfPassword; 
    @FXML private Button btnSignIn; 

    @FXML 
    void handlebtnSignIn(ActionEvent event){ 

     int userID = 0; 
     String username = "", accountType = ""; 
     byte[] encryptedPassword = null, salt = null; 
     if(tfUsername.getText().length() > 0 && pfPassword.getText().length() > 0) 
     { 
      try(Connection conn = DriverManager.getConnection("jdbc:sqlite:test.db"); 
       PreparedStatement stmt = createPreparedStatement(conn, tfUsername.getText()); 
       ResultSet rs = stmt.executeQuery()) 
      {    
       while(rs.next()) 
       { 
        userID = rs.getInt("user_id"); 
        username = rs.getString("username"); 
        encryptedPassword = rs.getBytes("password"); 
        salt = rs.getBytes("salt"); 
        accountType = rs.getString("account_type");    
       } 

       if(tfUsername.getText().equals(username) && authenticate(pfPassword.getText(), encryptedPassword, salt)) 
       { 
        Stage stage = new Stage(); 

        stage.setWidth(1080); 
        stage.setHeight(720); 
        Parent fxmlLoader = null; 

        switch(accountType) 
        { 
         case "administrator": 
          stage.setTitle("Tech Services Console"); 
          System.out.println("I just signed in as an administrator"); 
          fxmlLoader = FXMLLoader.load(getClass().getResource("AdminView.fxml")); 
          break; 
         case "collection": 
          stage.setTitle("Collection Console"); 
          System.out.println("I just signed in as a collection member"); 
          fxmlLoader = FXMLLoader.load(getClass().getResource("CollectionDevView.fxml")); 
          break; 
         case "selector": 
          stage.setTitle("Selector Console"); 
          System.out.println("I just signed in as a selector member"); 
          fxmlLoader = FXMLLoader.load(getClass().getResource("Selector.fxml")); 
          break; 
        } 


        stage.setScene(new Scene(fxmlLoader)); 

        stage.show(); 
        ((Node)(event.getSource())).getScene().getWindow().hide(); 
        tfUsername.setText(""); 
        pfPassword.setText(""); 
       } 
       else 
       { 
        Alert alert = new Alert(Alert.AlertType.INFORMATION); 
        alert.setHeaderText(null); 
        alert.setContentText("Incorrect username or password!"); 
        alert.showAndWait(); 
       } 
      } 
      catch (SQLException ex) { 
       Alert alert = new Alert(Alert.AlertType.INFORMATION); 
       alert.setHeaderText(null); 
       alert.setContentText("Incorrect username or password!"); 
       alert.showAndWait(); 
       System.out.println(ex.toString()); 
      } catch (NoSuchAlgorithmException | InvalidKeySpecException | IOException ex) { 
       Logger.getLogger(FXMLDocumentController.class.getName()).log(Level.SEVERE, null, ex); 
      } 
     }   
    } 

    @FXML 
    void handleEnterButtonPress(KeyEvent event) 
    { 
     if(event.getCode().equals(KeyCode.ENTER)) 
     { 
      btnSignIn.fire(); 
     } 
    } 

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

    private PreparedStatement createPreparedStatement(Connection con, String username) throws SQLException { 
     String sql = "SELECT * FROM User WHERE username = ?"; 
     PreparedStatement ps = con.prepareStatement(sql); 
     ps.setString(1, username); 
     return ps; 
    } 

    boolean authenticate(String attemptedPassword, byte[] encryptedPassword, byte[] salt) throws NoSuchAlgorithmException, InvalidKeySpecException 
    { 
     byte[] encryptedAttmeptedPassword = getEncryptedPassword(attemptedPassword, salt); 
     return Arrays.equals(encryptedPassword, encryptedAttmeptedPassword); 
    } 

    public byte[] getEncryptedPassword(String password, byte[] salt) throws NoSuchAlgorithmException, InvalidKeySpecException 
    { 
     String algorithm = "PBKDF2WithHmacSHA1"; 
     int derivedKeyLength = 160; 
     int iterations = 2000; 
     KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, iterations, derivedKeyLength); 
     SecretKeyFactory f = SecretKeyFactory.getInstance(algorithm); 

     return f.generateSecret(spec).getEncoded(); 
    } 

    public byte[] generateSalt() throws NoSuchAlgorithmException 
    {  
     SecureRandom random = SecureRandom.getInstance("SHA1PRNG"); 
     byte[] salt = new byte[8]; 
     random.nextBytes(salt); 

     return salt; 
    } 
} 

FXML

<?xml version="1.0" encoding="UTF-8"?> 

<?import javafx.geometry.Insets?> 
<?import javafx.scene.control.Button?> 
<?import javafx.scene.control.Label?> 
<?import javafx.scene.control.PasswordField?> 
<?import javafx.scene.control.TextField?> 
<?import javafx.scene.layout.AnchorPane?> 
<?import javafx.scene.layout.ColumnConstraints?> 
<?import javafx.scene.layout.GridPane?> 
<?import javafx.scene.layout.RowConstraints?> 
<?import javafx.scene.text.Font?> 
<?import javafx.scene.text.Text?> 

<AnchorPane id="apMain" onKeyReleased="#handleEnterButtonPress" prefHeight="350.0" prefWidth="425.0" stylesheets="@../css/log_in_stylesheet.css" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="planningchart3.FXMLDocumentController"> 
    <children> 
     <GridPane alignment="CENTER" hgap="10.0" layoutX="45.0" layoutY="69.0" prefHeight="284.0" prefWidth="448.0" vgap="10.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0"> 
     <columnConstraints> 
      <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
      <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
      <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
      <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
      <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
     </columnConstraints> 
     <rowConstraints> 
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> 
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> 
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> 
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> 
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> 
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> 
     </rowConstraints> 
     <padding> 
      <Insets bottom="25.0" left="25.0" right="25.0" top="25.0" /> 
     </padding> 
     <children> 
      <TextField fx:id="tfUsername" promptText="username" text="sedj601" GridPane.columnIndex="2" GridPane.columnSpan="2" GridPane.rowIndex="3" /> 
      <PasswordField fx:id="pfPassword" prefHeight="25.0" prefWidth="107.0" promptText="password" text="hello" GridPane.columnIndex="2" GridPane.columnSpan="2" GridPane.rowIndex="4" /> 
      <Button fx:id="btnSignIn" alignment="CENTER" contentDisplay="CENTER" mnemonicParsing="false" onAction="#handlebtnSignIn" prefHeight="30.0" prefWidth="92.0" text="Sign in" wrapText="true" GridPane.columnIndex="3" GridPane.rowIndex="5" /> 
      <Text id="welcomeText" strokeType="OUTSIDE" strokeWidth="0.0" text="Welcome" GridPane.columnIndex="1" GridPane.rowIndex="2"> 
       <font> 
        <Font name="Tahoma" size="20.0" /> 
       </font> 
      </Text> 
      <Label styleClass="outline" text="User name: " textFill="#03244d" GridPane.columnIndex="1" GridPane.columnSpan="2" GridPane.rowIndex="3"> 
       <font> 
        <Font name="Cambria Bold" size="14.0" /> 
       </font></Label> 
      <Label styleClass="outline" text="Password: " textFill="#03244d" GridPane.columnIndex="1" GridPane.columnSpan="2" GridPane.rowIndex="4"> 
       <font> 
        <Font name="Cambria Bold" size="14.0" /> 
       </font></Label> 
     </children> 
     </GridPane> 
    </children> 
</AnchorPane> 

나는 인사에 sedj601과 암호에 사용자 이름을 설정합니다. 그 부분을 없앨 수 있습니다.

이것은 도움이되었습니다. here입니다.

이 부분은 아마도 귀하의 질문에 도움이 될 것입니다.

try 
{ 
    if(tfUsername.getText().equals(username) && authenticate(pfPassword.getText(), encryptedPassword, salt)) 
    { 
     Stage stage = new Stage(); 
     stage.setWidth(1080); 
     stage.setHeight(720); 
     Parent fxmlLoader = null; 

     switch(accountType) 
     { 
      case "administrator": 
       stage.setTitle("Tech Services Console"); 
       System.out.println("I just signed in as an administrator"); 
       fxmlLoader = FXMLLoader.load(getClass().getResource("AdminView.fxml")); 
       break; 
      case "collection": 
       stage.setTitle("Collection Console"); 
       System.out.println("I just signed in as a collection member"); 
       fxmlLoader = FXMLLoader.load(getClass().getResource("CollectionDevView.fxml")); 
       break; 
      case "selector": 
       stage.setTitle("Selector Console"); 
       System.out.println("I just signed in as a selector member"); 
       fxmlLoader = FXMLLoader.load(getClass().getResource("Selector.fxml")); 
       break; 
     } 

     stage.setScene(new Scene(fxmlLoader)); 
     stage.show(); 
     ((Node)(event.getSource())).getScene().getWindow().hide(); 
     tfUsername.setText(""); 
     pfPassword.setText(""); 
    } 
    else 
    { 
     Alert alert = new Alert(Alert.AlertType.INFORMATION); 
     alert.setHeaderText(null); 
     alert.setContentText("Incorrect username or password!"); 
     alert.showAndWait(); 
    } 
} 
catch (SQLException ex) { 
    Alert alert = new Alert(Alert.AlertType.INFORMATION); 
    alert.setHeaderText(null); 
    alert.setContentText("Incorrect username or password!"); 
    alert.showAndWait(); 
    System.out.println(ex.toString()); 
} 
catch (NoSuchAlgorithmException | InvalidKeySpecException | IOException ex)   
{ 
    Logger.getLogger(FXMLDocumentController.class.getName()).log(Level.SEVERE, null, ex); 
}