这个问题在这里已有答案：
对于我的JavaFX应用程序，我无法将数据从一个控制器类传输到另一个控制器类。我花了4天时间试图找到解决方案但没有成功。将会感激任何和所有建议，因为我真的不知道接下来要尝试什么。 在尝试从表中的整行获取数据之前，我只是尝试在标签中设置文本。
先感谢您。
UPDATE
移动Parent root = fxmlLoader.load();后
上图：ManageUserController manageUserController = fxmlLoader.getController();对我有意义，我仍然收到相同的NullPointerExcepetion，现在只触发：manageUserController.setData("Test Text");
更新2
固定！基本上，这是因为每个场景在加载应用程序时已经初始化，因此无法写入fxml文件。
// testController.java
package home;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.input.MouseEvent;
import javafx.stage.Stage;
import java.io.IOException;
import java.net.URL;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ResourceBundle;
public class testcontroller implements Initializable {
@Override
public void initialize(URL location, ResourceBundle resources) {
public void switchscenes(MouseEvent mouseEvent) {
try {
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("manage-user.fxml"));
Parent root = fxmlLoader.load();
ManageUserController manageUserController = fxmlLoader.getController();
//
manageUserController.userdetails(tblAllUsers.getSelectionModel().getSelectedItem().getFirstname());
//////////// WHERE MY CODE BREAKS /////////
manageUserController.setData("Test Text");
System.err.println("before loading");
//Method for testing purposes for moving between Scene
Stage stage = new Stage();
stage.setScene(new Scene(root));
stage.setTitle("");
stage.show();
// Method for testing purposes for moving between Scene
// Node node = (Node) mouseEvent.getSource();
// Stage stage = (Stage)node.getScene().getWindow();
// stage.close();
//
// Scene scene = new Scene(FXMLLoader.load(getClass().getResource("Staff_Menu.fxml")));
// stage.setScene(scene);
// stage.show();
// How I normally move between Scenes (Have a seperate library)
// Scene_Library.SwitchToManageUser();
// System.err.println("Transferring To User Manager Scene");
} catch (IOException e) {
e.printStackTrace();
}
// All ready Tried
// String data = "Hello World!";
// FXMLLoader loader = new FXMLLoader(getClass().getResource("manage-user.fxml"));
// try {
// loader.load();
// } catch (IOException e) {
// //e.printStackTrace();
// System.err.println(e);
//
// }
// ManageUserController controller = new ManageUserController();
// controller.setData(data);
// Scene_Library.SwitchToManageUser();
// System.err.println("Transferring To User Manager Scene");
}
}
// ManageUserController.java
package home;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import java.net.URL;
import java.util.ResourceBundle;
public class ManageUserController implements Initializable {
private MemberObject currentMember;
Logger logger = Logger.getLogger(getClass().getName());
public Label lblUsernameID;
@FXML
public Label lblName;
@FXML
public Button btnUpdateUser;
@FXML
public Button btnUserBookings;
@FXML
public Button btnManageMembership;
@FXML
public Button btnDeleteMember;
@FXML
public Button btnBack;
@FXML
public Button btnSignOut;
public void setCurrentMember(MemberObject currentMember){
logger.log(Level.INFO, currentMember.firstname);
logger.log(Level.INFO, currentMember.lastname);
logger.log(Level.INFO, currentMember.email);
this.currentMember = currentMember;
this.lblUsernameID.setText((currentMember.getEmail()));
this.lblName.setText(currentMember.getFirstname() + " " + currentMember.getLastname());
}
@Override
public void initialize(URL location, ResourceBundle resources) {
}
}
//////// FXML File i'm trying to write data too ////////
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Font?>
<AnchorPane fx:id="parent" style="-fx-background-color: transparent;" xmlns="http://javafx.com/javafx/8.0.172-ea" xmlns:fx="http://javafx.com/fxml/1" fx:controller="home.ManageUserController">
<children>
<HBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" style="-fx-background-color: #F05F5C;" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<children>
<VBox alignment="CENTER" prefHeight="200.0" prefWidth="100.0" HBox.hgrow="ALWAYS">
<children>
<Label text="Manage Member" textAlignment="CENTER" textFill="WHITE">
<font>
<Font size="24.0" />
</font>
<VBox.margin>
<Insets bottom="10.0" />
</VBox.margin>
</Label>
<!-- <ImageView fitHeight="64.0" fitWidth="64.0" pickOnBounds="true" preserveRatio="true">0-->
<!-- <image>-->
<!-- <Image url="@../images/icons/logo/beach100.png" />-->
<!-- </image>-->
<!-- </ImageView>-->
<HBox style="-fx-border-color: white; -fx-background-radius: 0;">
<VBox.margin>
<Insets left="50.0" right="50.0" top="10.0" />
</VBox.margin>
<children>
<Label fx:id="lblUsernameID" prefHeight="31.0" prefWidth="206.0" text="Username ID" textFill="WHITE" HBox.hgrow="ALWAYS">
<padding>
<Insets left="10.0" />
</padding>
</Label>
<Button mnemonicParsing="false" prefHeight="31.0" style="-fx-background-color: transparent;" HBox.hgrow="ALWAYS">
<graphic>
<ImageView fitHeight="24.0" fitWidth="24.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../images/icons/accnt/account.png" />
</image>
</ImageView>
</graphic>
</Button>
</children>
</HBox>
<HBox style="-fx-border-color: white; -fx-background-radius: 0;">
<children>
<Label fx:id="lblName" prefHeight="31.0" prefWidth="206.0" text="First and Last Name" textFill="WHITE" HBox.hgrow="ALWAYS">
<padding>
<Insets left="10.0" />
</padding>
</Label>
<Button mnemonicParsing="false" prefHeight="31.0" style="-fx-background-color: transparent;" HBox.hgrow="ALWAYS">
<graphic>
<ImageView fitHeight="24.0" fitWidth="24.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../images/icons/mrmbership/user.png" />
</image>
</ImageView>
</graphic>
</Button>
</children>
<VBox.margin>
<Insets left="50.0" right="50.0" top="10.0" />
</VBox.margin>
</HBox>
</children>
</VBox>
<VBox alignment="CENTER" prefWidth="250.0" style="-fx-background-color: #26283c;">
<children>
<HBox alignment="CENTER" style="-fx-background-color: #2b2a4c;">
<VBox.margin>
<Insets left="20.0" right="20.0" top="20.0" />
</VBox.margin>
<padding>
<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
</padding>
<children>
<Button fx:id="btnUpdateUser" mnemonicParsing="false" prefHeight="25.0" prefWidth="196.0" style="-fx-background-color: transparent; -fx-text-fill: white;" text="Update Details" HBox.hgrow="ALWAYS" />
<ImageView fitHeight="24.0" fitWidth="24.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../images/icons/general/baseline_settings_white_18dp.png" />
</image>
</ImageView>
</children>
</HBox>
<HBox alignment="CENTER" style="-fx-background-color: #2b2a4c;">
<padding>
<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
</padding>
<children>
<Button fx:id="btnUserBookings" mnemonicParsing="false" prefHeight="25.0" prefWidth="196.0" style="-fx-background-color: transparent; -fx-text-fill: white;" text="Bookings" HBox.hgrow="ALWAYS" />
<ImageView fitHeight="24.0" fitWidth="24.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../images/icons/mrmbership/user.png" />
</image>
</ImageView>
</children>
<VBox.margin>
<Insets left="20.0" right="20.0" top="10.0" />
</VBox.margin>
</HBox>
<HBox alignment="CENTER" style="-fx-background-color: #2b2a4c;">
<padding>
<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
</padding>
<children>
<Button fx:id="btnManageMembership" mnemonicParsing="false" prefHeight="25.0" prefWidth="196.0" style="-fx-background-color: transparent; -fx-text-fill: white;" text="Manage Membership" HBox.hgrow="ALWAYS" />
<ImageView fitHeight="24.0" fitWidth="24.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../images/icons/mrmbership/usergold.png" />
</image>
</ImageView>
</children>
<VBox.margin>
<Insets left="20.0" right="20.0" top="10.0" />
</VBox.margin>
</HBox>
<HBox alignment="CENTER" style="-fx-background-color: #2b2a4c;">
<padding>
<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
</padding>
<children>
<Button fx:id="btnDeleteMember" mnemonicParsing="false" prefHeight="25.0" prefWidth="196.0" style="-fx-background-color: transparent; -fx-text-fill: white;" text="Detele Member" HBox.hgrow="ALWAYS" />
<ImageView fitHeight="24.0" fitWidth="24.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../images/icons/general/baseline_close_white_18dp.png" />
</image>
</ImageView>
</children>
<VBox.margin>
<Insets left="20.0" right="20.0" top="10.0" />
</VBox.margin>
</HBox>
<HBox alignment="CENTER">
<padding>
<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
</padding>
<children>
<Button fx:id="btnBack" mnemonicParsing="false" prefHeight="32.0" prefWidth="140.0" style="-fx-background-color: transparent; -fx-text-fill: white;" text="Back" HBox.hgrow="ALWAYS">
<HBox.margin>
<Insets left="5.0" />
</HBox.margin>
</Button>
<Button fx:id="btnSignOut" mnemonicParsing="false" prefHeight="32.0" prefWidth="140.0" style="-fx-background-color: transparent; -fx-text-fill: white;" text="Sign Out" />
</children>
<VBox.margin>
<Insets left="20.0" right="20.0" top="10.0" />
</VBox.margin>
</HBox>
</children>
<HBox.margin>
<Insets />
</HBox.margin>
</VBox>
</children>
</HBox>
</children>
<opaqueInsets>
<Insets />
</opaqueInsets>
</AnchorPane>
// MY ERROR LOG
/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/bin/java "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=60327:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/lib/tools.jar:/Users/jack/Dropbox/University/Coventry/year-2/260CT/Dev/Proto/out/production/Proto:/Users/jack/Documents/db-derby-10.14.2.0-bin/lib/derby.jar:/Users/jack/Documents/db-derby-10.14.2.0-bin/lib/derbyclient.jar:/Users/jack/Documents/db-derby-10.14.2.0-bin/lib/derbynet.jar:/Users/jack/Documents/db-derby-10.14.2.0-bin/lib/derbytools.jar:/Users/jack/Documents/mysql-connector-java-8.0.15.jar home.Main
Login Successful
Transferred to Home Page
Transferring to New test table
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3470)
at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3398)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3766)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$358(GlassViewEventHandler.java:432)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
... 28 more
Caused by: java.lang.NullPointerException
at home.ManageUserController.setData(ManageUserController.java:30)
at home.testcontroller.switchscenes(testcontroller.java:94)
... 38 more
您需要在获取控制器之前加载。
所以称之为，
Parent root = fxmlLoader.load();
在你打电话之前，
ManageUserController manageUserController = fxmlLoader.getController();