JavaFX登录界面不会切换场景

Question

我有一个 JavaFx 项目，它使用登录屏幕为经过认证的用户切换页面。但是，当我在文本字段和密码字段中使用正确的凭据按下登录按钮时，没有任何反应，也没有给出错误。有人可以帮我弄清楚为什么没有发生场景切换吗？

这是我的登录页面的 FXML 文件：

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

<?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.BorderPane?>
<?import javafx.scene.text.Font?>
<?import javafx.scene.text.Text?>

<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="500.0" prefWidth="700.0" xmlns="http://javafx.com/javafx/20.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.example.mall.HelloController">
    <left>
        <AnchorPane prefHeight="500.0" prefWidth="350.0" style="-fx-background-color: #6D5090;" BorderPane.alignment="CENTER">
            <children>
                <Text fill="WHITE" layoutX="92.0" layoutY="244.0" strokeType="OUTSIDE" strokeWidth="0.0" text="The Shopping Mall">
                    <font>
                        <Font size="20.0" />
                    </font>
                </Text>
            </children>
        </AnchorPane>
    </left>
    <right>
        <AnchorPane prefHeight="200.0" prefWidth="415.0" BorderPane.alignment="CENTER">
            <children>
                <TextField id="username" fx:id="usernameField" layoutX="101.0" layoutY="208.0" onAction="#login" promptText="Username" style="-fx-background-color: transparent; -fx-border-color: #0598ff; -fx-border-width: 0px 0px 2px 0px;" />
                <PasswordField id="password" fx:id="passwordField" layoutX="102.0" layoutY="261.0" onAction="#login" promptText="Password" style="-fx-background-color: transparent; -fx-border-color: #0598ff; -fx-border-width: 0px 0px 2px 0px;" />
                <Button fx:id="loginButton" layoutX="129.0" layoutY="335.0" mnemonicParsing="false" onAction="#login" prefHeight="34.0" prefWidth="90.0" style="-fx-background-color: #6D5090;" text="Login" textFill="WHITE" />
                <Text fill="#6d5090" layoutX="125.0" layoutY="129.0" strokeType="OUTSIDE" strokeWidth="0.0" text="User Login">
                    <font>
                        <Font size="22.0" />
                    </font>
                </Text>
                <Button layoutX="320.0" mnemonicParsing="false" onAction="#exit" prefHeight="28.0" prefWidth="30.0" style="-fx-background-color: transparent;">
                    <graphic>
                        <Text fill="#6d5090" strokeType="OUTSIDE" strokeWidth="0.0" text="X">
                            <font>
                                <Font size="16.0" />
                            </font>
                        </Text>
                    </graphic>
                </Button>
                <Label fx:id="errorLabel" layoutX="106.0" layoutY="402.0" text="Incorrect Login. Try Again" textFill="#ff4d4d" visible="false" />
            </children>
        </AnchorPane>
    </right>
</BorderPane>

这是我的控制器类：

package com.example.mall;


import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.input.MouseEvent;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import javafx.scene.Parent;
import java.io.IOException;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;
import java.util.HashMap;

import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;

public class HelloController {
    private Stage stage;
    private Scene scene;
    private Parent root;


    @FXML
    private Label errorLabel;

    @FXML
    private Button loginButton;

    @FXML
    private PasswordField passwordField;

    @FXML
    private TextField usernameField;

    @FXML
    private void exit(ActionEvent event) {
        System.exit(0);
    }

    

   @FXML
    public void login(ActionEvent event) throws IOException {

           HashMap<String,String> logininfo = new HashMap<String,String>();

           logininfo.put("customer","customer123");
           logininfo.put("staff","staff123");
           logininfo.put("ceo","ceo123");
           String username;
           username = usernameField.getText();
       System.out.println(username);
           String password;
           password = String.valueOf(passwordField.getText());

       System.out.println(password);

         if (event.getSource()==loginButton){
             //if(logininfo.containsKey(username)){
                 System.out.println("Switching scenesaaaaaaa");
                    if(logininfo.get(username).equals(password)){
                        System.out.println("Switching scenes");
                        switchScene(event, "ShoppingInterface.fxml");
                    }

            //}
         }

    }


    public void switchScene(ActionEvent event,String fxmlFileName) throws IOException {

            System.out.println("Switching to scene: " + fxmlFileName);
            FXMLLoader loader = new FXMLLoader(getClass().getResource(fxmlFileName));
            Scene newScene = new Scene(loader.load());
            Stage primaryStage = (Stage) ((Node)event.getSource()).getScene().getWindow();

            primaryStage.setScene(newScene);
            primaryStage.show();
        Parent root = FXMLLoader.load(getClass().getResource("Login.fxml"));

    }
}

这是我的主文件：

package com.example.mall;


import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import javafx.scene.Parent;
import java.io.IOException;

public class UserLogin extends Application {

    private double xOffset = 0;
    private double yOffset = 0;


    @Override
    public void start(Stage stage) throws IOException {
        Parent root = FXMLLoader.load(getClass().getResource("Login.fxml"));
        Scene scene = new Scene(root);

        stage.initStyle(StageStyle.DECORATED.UNDECORATED);

        root.setOnMousePressed(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent event){
                xOffset = event.getScreenX();
                yOffset = event.getScreenY();
            }

        });

        root.setOnMouseDragged(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent event){
                stage.setX(event.getScreenX() - xOffset );
                stage.setY(event.getScreenY() - yOffset );

            }
        });

        stage.setScene(scene);
        stage.show();
    }

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

我已经确保我的 onAction 链接到正确的方法名称，我什至尝试在输入用户名和密码的整个过程中使用打印语句，但即使这些语句也不会在终端内打印。

Answer 1

未来读者的解决方案：

解决方案是将所有内容复制到一个新项目中。之后就成功了。错误是提问者本人造成的。

感谢@James_D 解决了这个问题。