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&引用；FXMLLoader.constructLoadException；尝试运行java fx应用程序时

java xml javafx

&引用；FXMLLoader.constructLoadException；尝试运行java fx应用程序时,java,xml,javafx,Java,Xml,Javafx,我已经搜索了互联网的最深处，但似乎找不到答案 问题在于我想写的javaFx程序。但我只能添加控制器类。我几乎遵循了a能找到的每一个教程，但这个问题对我来说仍然是未知的 这是一个例外： javafx.fxml.LoadException: /U:/BankingSolutions/MediaCenterFX/bin/main/ressources/view/MainUI.fxml:12 at javafx.fxml.FXMLLoader.constructLoadException(FXMLL

我已经搜索了互联网的最深处，但似乎找不到答案

问题在于我想写的javaFx程序。但我只能添加控制器类。我几乎遵循了a能找到的每一个教程，但这个问题对我来说仍然是未知的

这是一个例外：

javafx.fxml.LoadException: 
/U:/BankingSolutions/MediaCenterFX/bin/main/ressources/view/MainUI.fxml:12

at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2617)
at javafx.fxml.FXMLLoader.access$700(FXMLLoader.java:104)
at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:927)
at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:976)
at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:216)
at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:738)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2723)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3230)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3191)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3164)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3140)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3120)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3113)
at application.Main.start(Main.java:15)
at com.sun.javafx.application.LauncherImpl$8.run(LauncherImpl.java:837)
at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:335)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
at com.sun.glass.ui.win.WinApplication$4$1.run(WinApplication.java:112)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: /java/controllers/MainUIController
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:925)
... 24 more
这就是代码。有三个类：Main.class、我使用scenebuilder 2创建的my MainUI.fxml和我的MainUIController.class，它们显然应该用作MainUI控制器

package application;

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


public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        try {
            AnchorPane root = (AnchorPane) FXMLLoader.load(getClass().getResource("/main/ressources/view/MainUI.fxml"));
            Scene scene = new Scene(root);
            primaryStage.setScene(scene);
            primaryStage.show();

        } catch(Exception e) {
            e.printStackTrace();
        }
    }

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

_______________________________________________

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

<?import javafx.scene.text.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.*?>
<?import javafx.geometry.*?>
<?import javafx.scene.image.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane fx:id="root" prefHeight="1080.0" prefWidth="1920.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="/java/controllers/MainUIController">
   <children>
      <BorderPane fx:id="borderPane01" layoutX="657.0" layoutY="304.0" prefHeight="336.0" prefWidth="403.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
         <bottom>
            <AnchorPane fx:id="bp_bottom" prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER" />
         </bottom>
         <left>
            <GridPane fx:id="bp_left_grid" prefHeight="680.0" prefWidth="238.0" BorderPane.alignment="CENTER">
              <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>
              <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 minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
              </rowConstraints>
               <children>
                  <Button fx:id="btn_search" mnemonicParsing="false" prefHeight="48.0" prefWidth="172.0" text="Suche" GridPane.columnSpan="2147483647" GridPane.halignment="CENTER" GridPane.hgrow="ALWAYS" GridPane.valignment="CENTER">
                     <GridPane.margin>
                        <Insets />
                     </GridPane.margin>
                     <font>
                        <Font size="24.0" />
                     </font>
                  </Button>
                  <Button fx:id="btn_series" mnemonicParsing="false" prefHeight="48.0" prefWidth="172.0" text="Serien" wrapText="true" GridPane.columnSpan="3" GridPane.halignment="CENTER" GridPane.rowIndex="1" GridPane.valignment="CENTER">
                     <font>
                        <Font size="24.0" />
                     </font>
                  </Button>
                  <Button fx:id="btn_download" mnemonicParsing="false" prefHeight="48.0" prefWidth="172.0" text="Download" GridPane.columnSpan="3" GridPane.halignment="CENTER" GridPane.rowIndex="3" GridPane.valignment="CENTER">
                     <font>
                        <Font size="24.0" />
                     </font>
                  </Button>
                  <Button fx:id="btn_movies" mnemonicParsing="false" prefHeight="48.0" prefWidth="172.0" text="Filme" wrapText="true" GridPane.columnSpan="3" GridPane.halignment="CENTER" GridPane.rowIndex="2" GridPane.valignment="CENTER">
                     <font>
                        <Font size="24.0" />
                     </font>
                  </Button>
                  <Button fx:id="btn_exit" mnemonicParsing="false" prefHeight="48.0" prefWidth="172.0" text="Beenden" GridPane.columnSpan="3" GridPane.halignment="CENTER" GridPane.rowIndex="6" GridPane.valignment="CENTER">
                     <font>
                        <Font size="24.0" />
                     </font>
                  </Button>
                  <Button fx:id="btn_settings" mnemonicParsing="false" prefHeight="48.0" prefWidth="172.0" text="Optionen" GridPane.columnSpan="3" GridPane.halignment="CENTER" GridPane.rowIndex="4" GridPane.valignment="CENTER">
                     <font>
                        <Font size="24.0" />
                     </font>
                  </Button>
                  <Button fx:id="btn_dashboard" mnemonicParsing="false" prefHeight="48.0" prefWidth="172.0" text="Dashboard" GridPane.columnSpan="3" GridPane.halignment="CENTER" GridPane.rowIndex="5" GridPane.valignment="CENTER">
                     <font>
                        <Font size="24.0" />
                     </font>
                  </Button>

               </children>
            </GridPane>
         </left>
         <top>
            <AnchorPane fx:id="bp_top" prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER">
               <children>
                  <Label fx:id="headlabel" alignment="CENTER" layoutX="737.0" layoutY="92.0" prefHeight="200.0" prefWidth="1920.0" text="Dashboard" textAlignment="CENTER" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
                     <font>
                        <Font size="48.0" />
                     </font>
                  </Label>
               </children>
            </AnchorPane>
         </top>
         <center>
            <AnchorPane fx:id="bp_center" prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER" />
         </center>
         <right>
            <AnchorPane fx:id="bp_right" prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER" />
         </right>
      </BorderPane>
   </children>
</AnchorPane>

______________________________________________

package main.java.controllers;

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

import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;

public class MainUIController{

    @FXML // ResourceBundle that was given to the FXMLLoader
    private ResourceBundle resources;

    @FXML // URL location of the FXML file that was given to the FXMLLoader
    private URL location;

    @FXML // fx:id="btn_search"
    private Button btn_search; // Value injected by FXMLLoader

    @FXML // fx:id="btn_movies"
    private Button btn_movies; // Value injected by FXMLLoader

    @FXML // fx:id="btn_exit"
    private Button btn_exit; // Value injected by FXMLLoader

    @FXML // fx:id="btn_series"
    private Button btn_series; // Value injected by FXMLLoader

    @FXML // fx:id="bp_right"
    private AnchorPane bp_right; // Value injected by FXMLLoader

    @FXML // fx:id="bp_bottom"
    private AnchorPane bp_bottom; // Value injected by FXMLLoader

    @FXML // fx:id="borderPane01"
    private BorderPane borderPane01; // Value injected by FXMLLoader

    @FXML // fx:id="headlabel"
    private Label headlabel; // Value injected by FXMLLoader

    @FXML // fx:id="bp_left_grid"
    private GridPane bp_left_grid; // Value injected by FXMLLoader

    @FXML // fx:id="bp_top"
    private AnchorPane bp_top; // Value injected by FXMLLoader

    @FXML // fx:id="root"
    private AnchorPane root; // Value injected by FXMLLoader

    @FXML // fx:id="btn_download"
    private Button btn_download; // Value injected by FXMLLoader

    @FXML // fx:id="btn_dashboard
    private Button btn_dashboard; // Value injected by FXMLLoader

    @FXML // fx:id="bp_center"
    private AnchorPane bp_center; // Value injected by FXMLLoader

    @FXML // fx:id="btn_settings"
    private Button btn_settings; // Value injected by FXMLLoader

    @FXML // This method is called by the FXMLLoader when initialization is complete
    void initialize() {
        assert root         != null : "fx:id=\"root\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert borderPane01 != null : "fx:id=\"borderPane01\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert bp_top       != null : "fx:id=\"bp_top\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert headlabel    != null : "fx:id=\"headlabel\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert bp_left_grid != null : "fx:id=\"bp_left_grid\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert bp_center    != null : "fx:id=\"bp_center\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert bp_right     != null : "fx:id=\"bp_right\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert bp_bottom    != null : "fx:id=\"bp_bottom\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert btn_search   != null : "fx:id=\"btn_search\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert btn_series   != null : "fx:id=\"btn_series\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert btn_movies   != null : "fx:id=\"btn_movies\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert btn_download != null : "fx:id=\"btn_download\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert btn_settings != null : "fx:id=\"btn_settings\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert btn_dashboard!= null : "fx:id=\"dashboard\" was not injected: check your FXML file 'MainUI.fxml'.";
        assert btn_exit     != null : "fx:id=\"btn_exit\" was not injected: check your FXML file 'MainUI.fxml'.";

        btn_search.setOnAction(value -> {
            System.out.println("Search pressed"); //TODO
        });
        btn_series.setOnAction(value ->{
            System.out.println("series pressed");
        });
        btn_movies.setOnAction(value ->{
            System.out.println("movies pressed");
        });
        btn_download.setOnAction(value ->{
            System.out.println("download pressed");
        });
        btn_settings.setOnAction(value ->{
            System.out.println("settings pressed");
        });
        btn_dashboard.setOnAction(value ->{
            System.out.println("dashboard pressed");
        });
        btn_exit.setOnAction(value ->{
            System.out.println("exit pressed");
        });


    }
}

fx:controller
属性需要控制器类的完全限定类名。也就是说，假设你有

package main.java.controllers ;

public class MainUIController { ... }
你应该

fx:controller="main.java.controllers.MainUIController"
我建议改变项目结构。资源不应存在于源本身中。因此，我的建议是以下项目结构：

src
|-application
    |here is my main application
|-main
    |-java
        |-controllers
            |here are my controllers
        |-dao
        |-service
    |-ressources
        |-css
        |-images
        |-view
           |here are the fxml files

src
|-main
    |-java <-- This should be your 'sources root'
        |-application <-- The application itself is within the new sources root
        |-controllers
            |here are my controllers
        |-dao
        |-service
    |-resources <-- all resources (css files, images, fxml files) should be with a subfolder of the resources. This folder should be marked as 'resources root'
        |-css
        |-images
        |-view
            |here are the fxml files
加载FXML文件应与以下各项配合使用：

AnchorPane root = (AnchorPane) FXMLLoader.load(getClass().getClassLoader().getResource("view/MainUI.fxml"));
作为以下解释的参考，请看一看：
ClassLoader
总是从资源的根开始。如果只使用
getClass
，则资源的路径是相对路径。经过多次处理，我自己决定始终使用绝对路径，因此使用
getClassLoader

如上面的链接所述，请注意

getClass().getClassLoader().getResource("view/MainUI.fxml");
可以用

getClass().getResource("view/MainUI.fxml");
我想我在某个地方读到过，如果可用，最好直接使用
InputStream
，因为在JAR文件中处理URL有时会很棘手（但我目前找不到支持这一点的参考）。因此，作为
getResource（..）
的替代方法，您可以使用：

FXMLLoader loader = new FXMLLoader();
Parent root = loader.load(getClass().getClassLoader().getResourceAsStream("view/MainUI.fxml");
考虑到
main/resources
只是类路径的路径，您是否尝试过将
getClass（）.getResource（“/main/resources/view/MainUI.fxml”）
替换为
getClass（）.getResource（“/view/MainUI.fxml”）
？您是否也可以为fxml添加代码。我认为您的fmxl中的控制器也不正确。不确定，但我猜
MainUIController
的软件包是错误的<代码>由以下原因引起：java.lang.ClassNotFoundException:/java/controllers/MainUIController表示类位于包
java.controllers
中，但类本身将包定义为：
package main.java.controllers@ItachiUchiha是的，我已经试过了：/@Malaka我编辑了我的帖子，并在其中添加了我的包结构。你有什么建议？我已经试过了，但谢谢你。：/但是，如果读取堆栈跟踪，显然问题出在
fx:controller
上，则不需要更改任何内容。在阅读了你的评论后，我稍微更新了答案。哇，对不起，老兄，我再次尝试了你的答案，并用Malakas的软件包架构建议对其进行了改进，现在它工作正常！！太棒了：）是的，谢谢你。除了java文件夹中的应用程序文件夹外，它是这样的。文本框一定是弄乱了我的间距。你可以按照马拉卡的建议，使用a生成一个布局（尽管如果你不熟悉Maven，它可能会让你感到困惑而不是帮助）。嗯。。getClassLoader（）-似乎未知。。我错过了什么进口货吗？@是的，对不起。请查看更新的行，这应该可以使用。作为
fxmloader
上的另一个注意事项，如果使用
load（InputStream）
方法，您将丢失任何基于位置的信息：即在FXML中不起作用。如果您有一个FXML资源（文件等），那么您应该使用基于URL的加载；在我看来，只有在“动态”生成流（即没有资源）的极少数情况下，才应该使用InputStream加载。我更喜欢
fxmloader l=newfxmloader（URL）；父根=l.load（）

FXMLLoader loader = new FXMLLoader();
Parent root = loader.load(getClass().getClassLoader().getResourceAsStream("view/MainUI.fxml");