将FXML文件加载到JavaFX中的Anchor窗格时出错 [英] Error in Loading FXML file into Anchor Pane in JavaFX
问题描述
我目前正在开发的程序有一个菜单和一个Anchor窗格，用于根据所选菜单项显示内容。在我的程序中，我想将我的fxml文件加载到内容锚窗格中，当用户点击时，该窗格再次位于主fxml文件中菜单项窗体菜单栏。我在main.fxml中构建了锚窗格。
My currently developing program has one menu and one Anchor Pane to show content according to the selected menu item.In my program,I want to load my fxml file into content anchor pane which is again inside the main fxml file when user clicks menu item form menu bar.I have built anchor pane in main.fxml.
<AnchorPane id="main_panel" layoutY="28.0" prefHeight="700.0" prefWidth="670.0" />
我在控制器类中为Main.fxml.DashBoard.fxml和DashBoard的控制器类构建了该方法.fxml也已定义。
I have built that method in controller class for Main.fxml.DashBoard.fxml and controller class for DashBoard.fxml is also already defined.
@FXML
private AnchorPane main_panel;
@FXML
private void go_item(ActionEvent event) throws IOException{
Parent dashboard;
dashboard = FXMLLoader.load(getClass().getResource("Dashboard.fxml"));
main_panel.getChildren().setAll(dashboard);
}
当我运行程序并单击项目菜单时，它显示了几个错误。我的代码有问题吗？感谢您的关注。
When I run the program and click Item Menu.It shows several errors.Is there something wrong with my codes?Thanks for your attention.
Glass detected outstanding Java exception at -[GlassViewDelegate sendJavaMouseEvent:]:src/com/sun/mat/ui/GlassViewDelegate.m:543
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1456)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:69)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:28)
at javafx.event.Event.fireEvent(Event.java:171)
at javafx.scene.control.MenuItem.fire(MenuItem.java:456)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.doSelect(ContextMenuContent.java:1199)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer$6.handle(ContextMenuContent.java:1148)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer$6.handle(ContextMenuContent.java:1146)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:69)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33)
at javafx.event.Event.fireEvent(Event.java:171)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3369)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3209)
at javafx.scene.Scene$MouseHandler.access$1900(Scene.java:3164)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1582)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2267)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:250)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:173)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:292)
at com.sun.glass.ui.View.handleMouseEvent(View.java:530)
at com.sun.glass.ui.View.notifyMouse(View.java:924)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:75)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:279)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1451)
... 36 more
Caused by: java.lang.NullPointerException
at project.MainController.go_item(MainController.java:45)
... 46 more
推荐答案
您在FXML中使用了错误的关键字。 id 已分配给控件，以便可以在样式表中引用它们。您需要使用 fx：id 才能在控制器中引用它，使用通过 @FXML 。
You are using the incorrect keyword in FXML. id is assigned to a control so that they can be referred in stylesheet. You need to use fx:id in order to be able to refer to it in the controller, using variables which are annotated via @FXML.
正确方式：
<AnchorPane fx:id="main_panel"
layoutY="28.0" prefHeight="700.0" prefWidth="670.0" />
有关更多信息，请查看这个答案。
For more information have a look at this answer.
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