在 javafx 从另一个包加载 FXML 文件时出现错误？

Question

我在从不同的包加载 fxml 文件时遇到问题。

项目结构

我的 class 加载 FXML 文件 PlayArea.java 如下所示：

package controller;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

/**
 *
 * @author badar
 */
public class PlayArea extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("/gui/FXMLDocument.fxml"));

        Scene scene = new Scene(root);

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

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

}

我的 fxml 文件是 FXMLDocument.fxml

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

<?import com.jfoenix.controls.JFXDrawer?>
<?import com.jfoenix.controls.JFXHamburger?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.HBox?>

<BorderPane fx:id="boderpane" minHeight="600.0" minWidth="600.0" prefHeight="600.0" prefWidth="600.0"  xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controller.FXMLDocumentController">
   <left>
      <JFXDrawer fx:id="drawer" defaultDrawerSize="200.0" prefHeight="503.0" prefWidth="200.0" BorderPane.alignment="CENTER" />
   </left>
   <top>
      <HBox nodeOrientation="LEFT_TO_RIGHT" style="-fx-background-color: #42A5F5;" BorderPane.alignment="CENTER">
         <children>
            <JFXHamburger fx:id="hamburger" prefHeight="100.0" prefWidth="100.0" />
         </children>
      </HBox>
   </top>
</BorderPane>

编辑：

错误信息：

Exception in Application start method
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 com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    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.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication5(LauncherImpl.java:182)
    at java.lang.Thread.run(Thread.java:745)
Caused by: javafx.fxml.LoadException: 
/home/badar/Documents/GitHub/DSA%20Lab%20Tasks/Playe%20Area/bin/gui/FXMLDocument.fxml

    at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2579)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
    at controller.PlayArea.start(PlayArea.java:22)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication12(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait5(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null3(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater4(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
    at com.sun.glass.ui.gtk.GtkApplication.lambda$null(GtkApplication.java:139)
    ... 1 more
Caused by: java.lang.NullPointerException: Location is required.
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
    at controller.FXMLDocumentController.initialize(FXMLDocumentController.java:65)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
    ... 17 more
Exception running application controller.PlayArea

Answer 1

您可以在 fxml 文件本身中设置控制器，如果您右键单击并打开该文件，您将找到属性，在那里您将有一个名为 controller 的标签，您可以输入确切的文件夹路径。

FXML EG

<AnchorPane id="AnchorPane" prefHeight="400.0" prefWidth="600.0" xmlns:fx="http://javafx.com/fxml" fx:controller="javafxapplication.FXMLController">

</AnchorPane>

Answer 2

你这行有问题

  Parent root = FXMLLoader.load(getClass().getResource("/gui/FXMLDocument.fxml"));

只需将其替换为

  Parent root = `FXMLLoader.load(getClass().getResource("../gui/FXMLDocument.fxml"));`

如果你仍然得到这个错误在你的包之外创建一个文件，即在 src 文件夹中说 Main.class

现在使用这个

FXMLLoader.load(Main.class.getResource("gui/FXMLDocument.fxml"));

Answer 3

更新之前的答案

这是尝试过的并且工作正常

Parent root = FXMLLoader.load(getClass().getResource("/fxml/Main.fxml"));
                Scene scene = new Scene(root, 300, 275);            
                stage.setTitle("FXML Welcome");
                stage.setScene(scene);
                stage.show();

希望这能解决问题

Answer 4

我必须更改 2 行才能从位于另一个数据包中的控制器正确打开 FXML 文件：

root = loader.load(Main.class.getResource("document.fxml").openStream());
scene.getStylesheets().add(Main.class.getResource("application.css").toExternalForm());

代替 getClass() 的是 Main.class .

在 javafx 从另一个包加载 FXML 文件时出现错误？

In javafx loading FXML file from another package and error appear?

java

eclipse

javafx

fxml