Question

我有一个包含10部电影的窗格，每当用户单击电影缩略图时，我都有一种方法可以将用户带到票证页面，他们可以在其中选择想要购买的票数。但是，当我从电影页面Controller调用电影对象时，我试图弄清楚如何在Controller类中传递电影对象loadTicketPage到被叫票页面。

public class controller {
    public void initialize() {
        film1.setImage(getFilmFromList(0).getThumbnail());
        film2.setImage(getFilmFromList(1).getThumbnail());
        film3.setImage(getFilmFromList(2).getThumbnail());
        film4.setImage(getFilmFromList(3).getThumbnail());
        film5.setImage(getFilmFromList(4).getThumbnail());
        film6.setImage(getFilmFromList(5).getThumbnail());
        film7.setImage(getFilmFromList(6).getThumbnail());
        film8.setImage(getFilmFromList(7).getThumbnail());
        film9.setImage(getFilmFromList(8).getThumbnail());
        film10.setImage(getFilmFromList(9).getThumbnail());

    }

    public void loadTicketPage(Film film) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("ticketsPage.fxml"));

            Scene scene = new Scene(root);
            Stage stage = new Stage();

            stage.initModality(Modality.APPLICATION_MODAL);

            stage.setScene(scene);
            stage.setTitle("Ticket Page");
            stage.show();

        } catch (IOException e) {
            System.out.println(e);
        }
    }

    public void film1() {
        Double price = getFilmFromList(0).getPrice();
        String title = getFilmFromList(0).getFilmName();
        loadTicketPage(getFilmFromList(0));

    }

    public void film2() {
        Double price = getFilmFromList(1).getPrice();
        String title = getFilmFromList(1).getFilmName();
        loadTicketPage(getFilmFromList(1));
    }
}

public class TicketsPageController {
    public Label filmName;
    public Label filmDescription;

    public void initialize() {
        filmName.setText(film.getFilmTitle)
    }
}

这是票证的fxml文件：

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

<?import java.lang.String?>
<?import javafx.collections.FXCollections?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.effect.SepiaTone?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>

<AnchorPane prefHeight="670.0" prefWidth="1000.0" style="-fx-background-color: maroon;" xmlns="http://javafx.com/javafx/8.0.172-ea" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.TicketsPageController">
   <children>
      <Label fx:id="lblHello" layoutX="308.0" layoutY="9.0" prefHeight="94.0" prefWidth="460.0" text="Hello! Welcome to Cinema Enterpriso" textAlignment="CENTER" textFill="WHITE" wrapText="true">
         <font>
            <Font name="Broadway" size="30.0" />
         </font>
      </Label>
      <ImageView fitHeight="141.0" fitWidth="297.0" layoutX="10.0" layoutY="10.0" pickOnBounds="true" preserveRatio="true">
         <image>
            <Image url="@images/University_of_Huddersfield_logo.jpg" />
         </image>
      </ImageView>
      <Button fx:id="btnOpenLogin" layoutX="770.0" layoutY="46.0" mnemonicParsing="false" onAction="#btnOpenLoginClick" style="-fx-background-color: tan;" text="Login">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnSignUp" layoutX="840.0" layoutY="46.0" mnemonicParsing="false" onAction="#btnCreateNewUser" style="-fx-background-color: tan;" text="Sign Up">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnBasket" layoutX="925.0" layoutY="46.0" mnemonicParsing="false" onAction="#btnOpenOrderSummary" style="-fx-background-color: tan;" text="Basket">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Label layoutX="35.0" layoutY="328.0" text="Please select your tickets:" textFill="WHITE">
         <font>
            <Font name="Broadway" size="24.0" />
         </font>
      </Label>
      <ComboBox fx:id="ticketType1" layoutX="51.0" layoutY="383.0" prefWidth="150.0" promptText="Ticket type" style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="Adult"> </String>
               <String fx:value="Child"> </String>
               <String fx:value="Teen"> </String>
               <String fx:value="Student"> </String>
               <String fx:value="Senior"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="ticketType2" layoutX="51.0" layoutY="437.0" prefWidth="150.0" promptText="Ticket type" style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="Adult"> </String>
               <String fx:value="Child"> </String>
               <String fx:value="Teen"> </String>
               <String fx:value="Student"> </String>
               <String fx:value="Senior"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="ticketType3" layoutX="51.0" layoutY="489.0" prefWidth="150.0" promptText="Ticket type" style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="Adult"> </String>
               <String fx:value="Child"> </String>
               <String fx:value="Teen"> </String>
               <String fx:value="Student"> </String>
               <String fx:value="Senior"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="ticketType4" layoutX="51.0" layoutY="541.0" prefWidth="150.0" promptText="Ticket type" style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="Adult"> </String>
               <String fx:value="Child"> </String>
               <String fx:value="Teen"> </String>
               <String fx:value="Student"> </String>
               <String fx:value="Senior"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="ticketType5" layoutX="51.0" layoutY="592.0" prefWidth="150.0" promptText="Ticket type" style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
          <items>
              <FXCollections fx:factory="observableArrayList">
                  <String fx:value="Adult"> </String>
                  <String fx:value="Child"> </String>
                  <String fx:value="Teen"> </String>
                  <String fx:value="Student"> </String>
                  <String fx:value="Senior"> </String>
              </FXCollections>
          </items>
      </ComboBox>
      <ComboBox fx:id="no1" layoutX="218.0" layoutY="383.0" prefHeight="31.0" prefWidth="79.0" promptText="no." style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="1"> </String>
               <String fx:value="2"> </String>
               <String fx:value="3"> </String>
               <String fx:value="4"> </String>
               <String fx:value="5"> </String>
               <String fx:value="6"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="no2" layoutX="217.0" layoutY="435.0" prefHeight="31.0" prefWidth="79.0" promptText="no." style="-fx-background-color: tan;">

         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="1"> </String>
               <String fx:value="2"> </String>
               <String fx:value="3"> </String>
               <String fx:value="4"> </String>
               <String fx:value="5"> </String>
               <String fx:value="6"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="no3" layoutX="217.0" layoutY="488.0" prefHeight="31.0" prefWidth="79.0" promptText="no." style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="1"> </String>
               <String fx:value="2"> </String>
               <String fx:value="3"> </String>
               <String fx:value="4"> </String>
               <String fx:value="5"> </String>
               <String fx:value="6"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="no4" layoutX="218.0" layoutY="542.0" prefHeight="31.0" prefWidth="79.0" promptText="no." style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="1"> </String>
               <String fx:value="2"> </String>
               <String fx:value="3"> </String>
               <String fx:value="4"> </String>
               <String fx:value="5"> </String>
               <String fx:value="6"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="no5" layoutX="217.0" layoutY="594.0" prefHeight="31.0" prefWidth="79.0" promptText="no." style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="1"> </String>
               <String fx:value="2"> </String>
               <String fx:value="3"> </String>
               <String fx:value="4"> </String>
               <String fx:value="5"> </String>
               <String fx:value="6"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <Label fx:id="filmName" layoutX="521.0" layoutY="123.0" text="Film" textFill="WHITE">
         <font>
            <Font name="Broadway" size="30.0" />
         </font>
      </Label>
      <Label fx:id="filmDescription" layoutX="485.0" layoutY="189.0" text="Description" textFill="WHITE">
         <font>
            <Font name="Broadway" size="24.0" />
         </font>
      </Label>
      <Button fx:id="btnAddToOrder1" layoutX="325.0" layoutY="383.0" mnemonicParsing="false" onAction="#btnAddTicketToOrder1" style="-fx-background-color: tan;" text="Add to order" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnAddToOrder2" layoutX="325.0" layoutY="435.0" mnemonicParsing="false" onAction="#btnAddTicketToOrder2" style="-fx-background-color: tan;" text="Add to order" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnAddToOrder3" layoutX="325.0" layoutY="489.0" mnemonicParsing="false" onAction="#btnAddTicketToOrder3" style="-fx-background-color: tan;" text="Add to order" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnAddToOrder4" layoutX="325.0" layoutY="541.0" mnemonicParsing="false" onAction="#btnAddTicketToOrder4" style="-fx-background-color: tan;" text="Add to order" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnAddToOrder5" layoutX="325.0" layoutY="595.0" mnemonicParsing="false" onAction="#btnAddTicketToOrder5" style="-fx-background-color: tan;" text="Add to order" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnBackHomepage" layoutX="485.0" layoutY="594.0" mnemonicParsing="false" onAction="#btnBackToHomePageClick" prefHeight="31.0" prefWidth="155.0" style="-fx-background-color: tan;" text="Back to Homepage" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
   </children>
</AnchorPane>

这是堆栈跟踪：

Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2566)
    ... 45 more
Caused by: java.lang.NullPointerException
    at sample.TicketsPageController.setStuff(TicketsPageController.java:54)
    at sample.TicketsPageController.initialize(TicketsPageController.java:41)
    ... 55 more

这是我的TicketPageController

package sample;

import javafx.event.ActionEvent;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.stage.Window;

import java.io.IOException;

public class TicketsPageController {
    public Label lblHello;
    public Button btnOpenLogin;
    public Button btnSignUp;
    public Button btnBasket;
    public Label filmName;
    public Label filmDescription;
    public ComboBox ticketType1;
    public ComboBox ticketType2;
    public ComboBox ticketType3;
    public ComboBox ticketType4;
    public ComboBox ticketType5;
    public ComboBox no1;
    public ComboBox no2;
    public ComboBox no3;
    public ComboBox no4;
    public ComboBox no5;
    public Button btnAddToOrder1;
    public Button btnAddToOrder2;
    public Button btnAddToOrder3;
    public Button btnAddToOrder4;
    public Button btnAddToOrder5;
    public Button btnBackHomepage;
    private String filmTitle;

    private Film film;

    public void initialize() {
          setStuff();
//        System.out.println(filmTitle);
          filmName.setText(filmTitle);
    }

//    public void setFilm(Film film) {
//        System.out.println("in set film");
//        this.film = film;
//
//    }

    public void setFilm(Film film) {
        this.film = film;
        filmName.setText(film.getFilmName());
    }

    public void setStuff() {
        System.out.println("test");
        filmTitle = film.getFilmName();
    }

    public String printFilm(){
        return film.getFilmName();
    }

    public void btnOpenLoginClick(ActionEvent actionEvent) {
        printFilm();
    }

    public void btnCreateNewUser(ActionEvent actionEvent) {
    }

    public void btnOpenOrderSummary(ActionEvent actionEvent) {
    }

    public void btnAddTicketToOrder1(ActionEvent actionEvent) {
    }

    public void btnAddTicketToOrder2(ActionEvent actionEvent) {
    }

    public void btnAddTicketToOrder3(ActionEvent actionEvent) {
    }

    public void btnAddTicketToOrder4(ActionEvent actionEvent) {
    }

    public void btnAddTicketToOrder5(ActionEvent actionEvent) {
    }

    public void btnBackToHomePageClick(ActionEvent actionEvent) throws IOException {
        Window mainWindow = btnBackHomepage.getScene().getWindow();
        Parent newRoot = FXMLLoader.load(getClass().getResource("homepage.fxml"));
        mainWindow.getScene().setRoot(newRoot);
    }
}

Answer 1

在新Pane的加载过程中，您可以从FXMLLoader获取控制器并将胶片传递给它：

public void loadTicketPage(Film film){
    try {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("ticketsPage.fxml"));

        Scene scene = new Scene(loader.load());
        Stage stage = new Stage();

        stage.initModality(Modality.APPLICATION_MODAL);

        stage.setScene(scene);
        stage.setTitle("Ticket Page");

        // get the controller and set the film
        TicketsPageController controller = loader.getController();
        controller.setFilm(film);

        stage.show();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

假设您的控制器如下所示：

public class TicketsPageController {
    private Film film;

    public Label filmName;
    public Label filmDescription;

    public void setFilm(Film film) {
        this.film = film;
        filmName.setText(film.getFilmTitle());
    }
}

如何将值传递给在该方法的Controller类中调用新页面的方法？

1 个答案: