Question

当我在登录屏幕中按下一步按钮时，出现以下错误：

线程“ JavaFX Application Thread”中的异常null java.lang.RuntimeException： java.lang.reflect.InvocationTargetException在 javafx.fxml.FXMLLoader $ MethodHandler.invoke（FXMLLoader.java:1774）在 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）处 javafx.event.Event.fireEvent（Event.java:198）在 javafx.scene.Node.fireEvent（Node.java:8411）在 javafx.scene.control.Button.fire（Button.java:185）在 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）处 javafx.event.Event.fireEvent（Event.java:198）在 javafx.scene.Scene $ MouseHandler.process（Scene.java:3757）在 javafx.scene.Scene $ MouseHandler.access $ 1500（Scene.java:3485）在 javafx.scene.Scene.impl_processMouseEvent（Scene.java:1762）在 javafx.scene.Scene $ ScenePeerListener.mouseEvent（Scene.java:2494）在 com.sun.javafx.tk.quantum.GlassViewEventHandler $ MouseEventNotification.run（GlassViewEventHandler.java:394）在 com.sun.javafx.tk.quantum.GlassViewEventHandler $ MouseEventNotification.run（GlassViewEventHandler.java:295）在java.security.AccessController.doPrivileged（本机方法）在 com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda $ handleMouseEvent $ 353（GlassViewEventHandler.java:432）在 com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock（QuantumToolkit.java:389）在 com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent（GlassViewEventHandler.java:431）在com.sun.glass.ui.View.handleMouseEvent（View.java:555）处 com.sun.glass.ui.View.notifyMouse（View.java:937）在 com.sun.glass.ui.win.WinApplication._runLoop（本机方法）位于 com.sun.glass.ui.win.WinApplication.lambda $ null $ 147（WinApplication.java:177）在java.lang.Thread.run（未知源）造成原因： java.lang.reflect.InvocationTargetException在 sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）位于 sun.reflect.NativeMethodAccessorImpl.invoke（未知来源）位于 sun.reflect.DelegatingMethodAccessorImpl.invoke（未知源）位于 java.lang.reflect.Method.invoke（来源未知） sun.reflect.misc.Trampoline.invoke（未知来源）位于 sun.reflect.GeneratedMethodAccessor1.invoke（未知源）位于 sun.reflect.DelegatingMethodAccessorImpl.invoke（未知源）位于 java.lang.reflect.Method.invoke（来源未知） sun.reflect.misc.MethodUtil.invoke（未知来源）位于 javafx.fxml.FXMLLoader $ MethodHandler.invoke（FXMLLoader.java:1771）... 48个以上的原因：java.lang.NumberFormatException：对于输入字符串： java.lang.NumberFormatException.forInputString上的“”（未知源）在java.lang.Integer.parseInt（未知源）在 java.lang.Integer.valueOf（来源未知） sample.controller.LoginController.login（LoginController.java:29）... 另外58个

我的登录页面：

import com.jfoenix.controls.JFXPasswordField;
import com.jfoenix.controls.JFXTextField;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.layout.Pane;
import javafx.scene.text.Text;
import sample.entity.Doctor;
import sample.entity.Patient;
import sample.db.SqlControl;

import java.io.IOException;

public class LoginController {

    private MainController mainController;
    public void setMainController(MainController mainController) {
        this.mainController = mainController;
    }

    @FXML
    JFXTextField loginField;
    @FXML
    JFXPasswordField passwordField;
    @FXML
    Text error;

    @FXML
    public void login() {
        String query = SqlControl.Login(loginField.getText(), passwordField.getText());
        if (Integer.valueOf(query) == 0) {
            error.setVisible(true);
        } else {
            if (Integer.valueOf(SqlControl.isAccountEnabled(loginField.getText())) != 0)
                LoadCabinet(SqlControl.loginRole(loginField.getText(), passwordField.getText()));
            else
                error.setVisible(true);
        }
    }

    @FXML
    public void backToMenu() {
        mainController.loadMenuScreen();
    }

    private void LoadCabinet(String role) {
        FXMLLoader loader;
        Pane pane;
        if (role.equals("admin")) {
            Doctor doctor = new SqlControl().getDoctorByLogin(loginField.getText());
            loader = new FXMLLoader(this.getClass().getResource("../resources/Doctor.fxml"));
            pane = null;
            try {
                pane = loader.load();
            } catch (IOException e) {
                e.printStackTrace();
            }
            DoctorController doctorController = loader.getController();
            doctorController.setDoctor(doctor);
            doctorController.Refresh();
            doctorController.setMainController(mainController);
            mainController.setScreen(pane);
        } else {
            if (role.equals("user")) {
                Patient patient = new SqlControl().getPatientByLogin(loginField.getText());
                loader = new FXMLLoader(this.getClass().getResource("../resources/Patient.fxml"));
                pane = null;
            try {
                pane = loader.load();
            } catch (IOException e) {
                e.printStackTrace();
            }
            PatientController patientController = loader.getController();
            patientController.setMainController(mainController);
            patientController.setPatient(patient);
            patientController.Refresh();
            mainController.setScreen(pane);
        }
    }
}

我的登录fxml页面：

<?xml version="1.0" encoding="UTF-8"?>

<?import com.jfoenix.controls.JFXButton?>
<?import com.jfoenix.controls.JFXTextField?>
<?import javafx.scene.layout.Pane?>
<?import javafx.scene.text.Font?>
<?import javafx.scene.text.Text?>

<?import com.jfoenix.controls.JFXPasswordField?>
<Pane id="pane-doctor" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="500.0" prefWidth="700.0" stylesheets="@css/style.css" xmlns="http://javafx.com/javafx/8.0.121" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.controller.LoginController">
   <children>
      <JFXTextField fx:id="loginField" layoutX="273.0" layoutY="141.0" />
      <JFXPasswordField fx:id="passwordField" layoutX="273.0" layoutY="224.0" />
      <Text layoutX="50.0" layoutY="133.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Login" textAlignment="CENTER" wrappingWidth="600.0">
         <font>
            <Font name="Ubuntu Light" size="25.0" />
         </font>
      </Text>
       <Text layoutX="50.0" layoutY="218.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Password" textAlignment="CENTER" wrappingWidth="600.0">
           <font>
               <Font name="Ubuntu Light" size="25.0" />
           </font>
       </Text>
       <JFXButton id="menu-button" fx:id="logAsADoctor" layoutX="269.0" layoutY="276.0" mnemonicParsing="false" onAction="#login" prefHeight="53.0" prefWidth="165.0" stylesheets="@css/style.css" text="Next">
           <font>
               <Font name="Ubuntu Light" size="13.0" />
           </font></JFXButton>
       <JFXButton id="menu-button" buttonType="FLAT" layoutX="269.0" layoutY="337.0" mnemonicParsing="false" onAction="#backToMenu" prefHeight="53.0" prefWidth="165.0" stylesheets="@css/style.css" text="Back" />
      <Text fill="RED" layoutX="51.0" layoutY="455.0" strokeType="OUTSIDE" strokeWidth="0.0"
           visible="false" fx:id="error" text="*Your username or password is not true!" textAlignment="CENTER" wrappingWidth="600.0">
         <font>
            <Font name="Ubuntu Light" size="25.0" />
         </font>
      </Text>

   </children>
</Pane>

Answer 1

stacktrace说：

Caused by: java.lang.NumberFormatException: For input string: "" 
    at java.lang.NumberFormatException.forInputString(Unknown Source) 
    at java.lang.Integer.parseInt(Unknown Source) 
    at java.lang.Integer.valueOf(Unknown Source) 
    at sample.controller.LoginController.login(LoginController.java:29) ... 58 more

发生这种情况的语句是：

  if (Integer.valueOf(SqlControl.isAccountEnabled(loginField.getText())) != 0)

您正在尝试将空字符串解析为整数。您的代码需要采取相关的预防措施以阻止这种情况的发生。

错误：线程“ JavaFX Application Thread”中的异常为空

1 个答案: