因为我使用scenebuilder将方法从控制器类连接到Login.fxml文件，所以我遇到了这个错误。 login.fxml文件中的register按钮应该重定向到regForm.fxml接口，而是发生错误。
'主'类代码
package sample;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("UGNiP Education portal");
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
“控制器”类代码
package sample;
import javafx.fxml.FXMLLoader;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import java.awt.event.ActionEvent;
import java.io.IOException;
public class Controller {
public void regBtnClicked(ActionEvent event) throws IOException {
Parent regForm = FXMLLoader.load(getClass().getResource("regForm.fxml"));
Scene regScene = new Scene(regForm);
// To get the stage info
Stage window = (Stage) ((Node) event.getSource()).getScene().getWindow();
window.setScene(regScene);
window.show();
}
}
登录页面
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.PasswordField?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="294.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.141" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<Label alignment="TOP_CENTER" layoutX="126.0" text="UGNiP Login Page">
<font>
<Font size="43.0" />
</font>
</Label>
<Label layoutX="66.0" layoutY="78.0" prefHeight="17.0" prefWidth="44.0" text="I.D: ">
<font>
<Font size="14.0" />
</font>
</Label>
<TextField layoutX="126.0" layoutY="74.0" promptText="123456789" />
<Label layoutX="309.0" layoutY="78.0" prefHeight="17.0" prefWidth="65.0" text="Password:">
<font>
<Font size="14.0" />
</font>
</Label>
<PasswordField layoutX="401.0" layoutY="74.0" promptText="******" />
<Button layoutX="253.0" layoutY="188.0" mnemonicParsing="false" text="Login" />
<Button layoutX="344.0" layoutY="188.0" mnemonicParsing="false" onAction="#regBtnClicked" text="Register" />
</children>
</AnchorPane>
注册表单XML文件
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.PasswordField?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.141" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<TextField layoutX="130.0" layoutY="119.0" promptText="John" />
<TextField layoutX="408.0" layoutY="119.0" promptText="Doe" />
<TextField layoutX="130.0" layoutY="175.0" promptText="123456789" />
<PasswordField layoutX="408.0" layoutY="175.0" promptText="********" />
<TextField layoutX="130.0" layoutY="224.0" promptText="example@example.com" />
<TextField layoutX="408.0" layoutY="224.0" promptText="0771234567" />
<Label layoutX="36.0" layoutY="123.0" text="First Name: " />
<Label layoutX="15.0" layoutY="179.0" text="Identification code: " />
<Label layoutX="52.0" layoutY="228.0" text="Email:" />
<Label layoutX="322.0" layoutY="123.0" text="Last Name: " />
<Label layoutX="325.0" layoutY="179.0" text="Password: " />
<Label layoutX="299.0" layoutY="228.0" text="Telephone Number: " />
<Button layoutX="244.0" layoutY="298.0" mnemonicParsing="false" text="Confirm Registration " />
<Button layoutX="32.0" layoutY="354.0" mnemonicParsing="false" text="Back" />
<Label layoutX="225.0" layoutY="42.0" text="Registration ">
<font>
<Font size="30.0" />
</font>
</Label>
<Button layoutX="248.0" layoutY="354.0" mnemonicParsing="false" text="Cancel Registration " />
</children>
</AnchorPane>
控制台中的错误消息
Exception in Application start method
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 com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
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.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: javafx.fxml.LoadException: Error resolving onAction='#regBtnClicked', either the event handler is not in the Namespace or there is an error in the script.
/C:/Users/muizu/Documents/codes/cwk3/out/production/cwk3/sample/Login.fxml:31
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2597)
at javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:103)
at javafx.fxml.FXMLLoader$Element.processEventHandlerAttributes(FXMLLoader.java:610)
at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:770)
at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2823)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2532)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at sample.Main.start(Main.java:13)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
... 1 more
Exception running application sample.Main
答案 0 :(得分：0)
login.fxml的控制器应该有一个名为regBtnClicked的方法。
@FXML private void regBtnClicked(ActionEvent event)
{
....
}