Question

我有这个按钮，当我想动态地将图像添加到我的AnchorPane时，但目前它没有按预期工作。我试图在JavaFX标签内加载图像，这是我的代码。

FXMLDocumentController.java

public class FXMLDocumentController implements Initializable {

    @FXML
    private Label label;
    public AnchorPane pane;

    @FXML
    private void handleButtonAction(ActionEvent event) throws IOException {

      //   BufferedImage image = ImageIO.read(new File("2d.png"));
      Label label = new Label();
      Image image = new Image(getClass().getResourceAsStream("2d.png"));
      label = new Label("search", new ImageView(image));
      pane.getChildren().addAll(label);      
    }

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

}

FXMLDocument.fxml

<AnchorPane id="AnchorPane" fx:id="AnchorPane" prefHeight="521.0" prefWidth="548.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.111" fx:controller="testingcards.FXMLDocumentController">
    <children>
        <Button fx:id="button" layoutX="126" layoutY="90" onAction="#handleButtonAction" text="Click Me!" />
        <Label fx:id="label" layoutX="126" layoutY="120" minHeight="16" minWidth="69" />
      <Label layoutX="143.0" layoutY="366.0" prefHeight="121.0" prefWidth="69.0" text="Label" />
    </children>
</AnchorPane>

错误

线程中的异常＆＃34; JavaFX应用程序线程＆＃34; 了java.lang.RuntimeException： java.lang.reflect.InvocationTargetException at javafx.fxml.FXMLLoader $ MethodHandler.invoke（FXMLLoader.java:1774）at at javafx.fxml.FXMLLoader $ ControllerMethodEventHandler.handle（FXMLLoader.java:1657）在 com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent（CompositeEventHandler.java:86）在 com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent（EventHandlerManager.java:238）在 com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent（EventHandlerManager.java:191）在 com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent（CompositeEventDispatcher.java:59）在 com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:58）在 com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在 com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:56）在 com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在 com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:56）在 com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在com.sun.javafx.event.EventUtil.fireEventImpl（EventUtil.java:74）在com.sun.javafx.event.EventUtil.fireEvent（EventUtil.java:49）at javafx.event.Event.fireEvent（Event.java:198）at javafx.scene.Node.fireEvent（Node.java:8411）at javafx.scene.control.Button.fire（Button.java:185）at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased（ButtonBehavior.java:182）在 com.sun.javafx.scene.control.skin.BehaviorSkinBase $ 1.handle（BehaviorSkinBase.java:96）在 com.sun.javafx.scene.control.skin.BehaviorSkinBase $ 1.handle（BehaviorSkinBase.java:89）在 com.sun.javafx.event.CompositeEventHandler $ NormalEventHandlerRecord.handleBubblingEvent（CompositeEventHandler.java:218）在 com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent（CompositeEventHandler.java:80）在 com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent（EventHandlerManager.java:238）在 com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent（EventHandlerManager.java:191）在 com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent（CompositeEventDispatcher.java:59）在 com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:58）在 com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在 com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:56）在 com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在 com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:56）在 com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:114）在com.sun.javafx.event.EventUtil.fireEventImpl（EventUtil.java:74）在com.sun.javafx.event.EventUtil.fireEvent（EventUtil.java:54）at javafx.event.Event.fireEvent（Event.java:198）at javafx.scene.Scene $ MouseHandler.process（Scene.java:3757）at javafx.scene.Scene $ MouseHandler.access $ 1500（Scene.java:3485）at at javafx.scene.Scene.impl_processMouseEvent（Scene.java:1762）at javafx.scene.Scene $ ScenePeerListener.mouseEvent（Scene.java:2494）at at com.sun.javafx.tk.quantum.GlassViewEventHandler $ MouseEventNotification.run（GlassViewEventHandler.java:380）在 com.sun.javafx.tk.quantum.GlassViewEventHandler $ MouseEventNotification.run（GlassViewEventHandler.java:294）在java.security.AccessController.doPrivileged（Native Method）at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda $ handleMouseEvent $ 354（GlassViewEventHandler.java:416）在 com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock（QuantumToolkit.java:389）在 com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent（GlassViewEventHandler.java:415）在com.sun.glass.ui.View.handleMouseEvent（View.java:555）at com.sun.glass.ui.View.notifyMouse（View.java:937）at com.sun.glass.ui.win.WinApplication._runLoop（Native Method）at com.sun.glass.ui.win.WinApplication.lambda为$ null $ 148（WinApplication.java:191）在java.lang.Thread.run（Thread.java:745）引起： java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）在 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:498）at sun.reflect.misc.Trampoline.invoke（MethodUtil.java:71）at sun.reflect.GeneratedMethodAccessor1.invoke（未知来源）at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:498）at sun.reflect.misc.MethodUtil.invoke（MethodUtil.java:275）at javafx.fxml.FXMLLoader $ MethodHandler.invoke（FXMLLoader.java:1769）... 48更多引起：java.lang.NullPointerException at testingcards.FXMLDocumentController.handleButtonAction（FXMLDocumentController.java:46）

我正在使用netbeans IDE

Answer 1

您需要创建ImageView，或者如果您正在使用场景构建器，请将ImageView拖放到AnchorPane区域。为新ImageView分配ID;

在你的控制器类中;

  @FXML
  ImageView imageId;

  @FXML
  private void handleButtonAction(ActionEvent event) throws IOException {
      Image img = new Image("../img/img.jpg");
      imageId.setImage(img);
  }

Answer 2

如果该方法不起作用，则可以使用此方法。我已经尝试了大部分可以在网上找到的解决方案，但是这些解决方案对我来说并不起作用。

我已将文件路径转换为文件，并将其用作源。

String imgAddress = "C:\\Users\\Name\\onclickimageloader\\car.jpg";
String tmpAddress;

File file2 = new File(imgAddress);
tmpAddress = file2.toURI().toURL().toExternalForm();
Image image = new Image(tmpAddress);
imageId.setImage(image);
System.out.println(tmpAddress);

在JavaFX中动态加载图像到Anchorpane

2 个答案: