從javafx中的控制器調用其他類方法

我目前正在JavaFx中做一個應用程序，並且我正在從Controller類調用主類方法。我檢查了Oracle提供的示例示例，並且在該示例中它工作正常。這是我的代碼：主類：從javafx中的控制器調用其他類方法

public class Boiler_New extends Application { 

private Stage stage; 
@Override 
public void start(Stage primarystage) throws Exception { 
    stage = primarystage; 
    stage.setTitle("Login"); 
    call1("Login.fxml"); 
    stage.show(); 


} 
public void call1(String fxml) throws IOException{ 
    FXMLLoader loader = new FXMLLoader(); 
    InputStream in = Boiler_New.class.getResourceAsStream(fxml); 
    loader.setBuilderFactory(new JavaFXBuilderFactory()); 
    loader.setLocation(Boiler_New.class.getResource(fxml)); 
    AnchorPane root = (AnchorPane)loader.load(in); 
    Scene scene = new Scene(root); 
    stage.setScene(scene); 

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

控制器：

public class LoginController extends AnchorPane implements Initializable { 

private Boiler_New application ; 
@FXML 
private Label label; 

@FXML 
private AnchorPane login_panel; 

@FXML 
private Button login_button; 

@FXML 
private ImageView close_button; 


public void setApp(Boiler_New application){ 
    this.application = application; 
} 

@FXML 
public void login_act(ActionEvent event) throws Exception { 

    application.call1("content.fxml"); 

} 

@Override 
public void initialize(URL url, ResourceBundle rb) { 
    // TODO 

}  
}

跟蹤：

Executing boiler_new.Boiler_New from C:\Users\BlackWorld\Documents\NetBeansProjects \Boiler_New\dist\run1175007848\Boiler_New.jar using platform C:\Program Files\Java\jdk1.7.0_25/bin/java 
***java.lang.RuntimeException: java.lang.reflect.InvocationTargetException*** 
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1440) 
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.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.Node.fireEvent(Node.java:6863) 
at javafx.scene.control.Button.fire(Button.java:179) 
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:193) 
at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:336) 
at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:329) 
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:64) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170) 
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) 
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53) 
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33) 
at javafx.event.Event.fireEvent(Event.java:171) 
at javafx.scene.Scene$MouseHandler.process(Scene.java:3328) 
at javafx.scene.Scene$MouseHandler.process(Scene.java:3168) 
at javafx.scene.Scene$MouseHandler.access$1900(Scene.java:3123) 
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1563) 
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2265) 
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:528) 
at com.sun.glass.ui.View.notifyMouse(View.java:922) 
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) 
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29) 
at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73) 
at java.lang.Thread.run(Thread.java:724) 
***Caused by: java.lang.reflect.InvocationTargetException*** 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:606) 
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:75) 
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:606) 
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:279) 
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1435) 
... 44 more 
***Caused by: java.lang.NullPointerException*** 
at boiler_new.LoginController.login_act(LoginController.java:50) 
... 54 more 
Exception in thread "JavaFX Application Thread" Deleting directory C:\Users\BlackWorld\Documents\NetBeansProjects\Boiler_New\dist\run1175007848

請幫助我。

來源

2013-06-22 Sarju

圍棋在調試和檢查Boiler_New.class.getResourceAsStream（FXML）的返回值看，如果它是空 –

我得到了solution.Thanks.Error是應用程序啓動時，控制器未初始化。 – Sarju

我面臨同樣的問題，爲了解決它執行以下操作：

刪除「CALL1（」 Login.fxml 「）;」從start（）方法。
從Boiler_new中刪除public void call1（String fxml）。

在LoginController中添加了新的功能如下：

private void openNewWindow(Event event) 
{ 

Parent root; 
try {      
    URL url = getClass().getResource("Content.fxml"); 
    FXMLLoader fxmlLoader = new FXMLLoader(); 
    fxmlLoader.setLocation(url); 
    fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory()); 
    root = (Parent)fxmlLoader.load(url.openStream());    
    Stage stage = new Stage(); 
    stage.setScene(new Scene(root, 1000, 800)); 
    stage.show(); 
    ((Node)(event.getSource())).getScene().getWindow().hide(); 

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

調用此函數，而不是application.call1（「content.fxml」）;

@FXML 
public void login_act(ActionEvent event) throws Exception { 

    openNewWindow(event); 
}

我相信它工作正常。

來源

2013-09-20 12:03:42

從javafx中的控制器調用其他類方法

回答

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