尝试处理一些代码，当我在tableview中选择一行时，它会自动显示在我添加新数据部分的文本框中。我设置了fxml，它与我的场景构建器进行交互。
我现在很确定问题是这行代码。 userNameBox将为null。
userNameBox.setText(staff.getuserName());
控制器代码
public class StaffController implements Initializable {
Connection conn;
ResultSet rs;
@FXML
private Label label;
@FXML
private TableView<Retailer> tableUser;
@FXML
private TableColumn<Retailer, String> columnuserName;
@FXML
private TableColumn<Retailer, String> columnfirstName;
@FXML
private TableColumn<Retailer, String> columnlastName;
@FXML
private TableColumn<Retailer, String> columnuserEmail;
@FXML
private TableColumn<Retailer, Integer> columnSalary;
@FXML
private Button btnLoad;
@FXML
private Button addButton;
@FXML
private TextField userNameBox;
@FXML
private TextField firstNameBox;
@FXML
private TextField lastNameBox;
@FXML
private TextField emailBox;
@FXML
private TextField salaryBox;
// Initialize observable list to hold out database data
private ObservableList<Retailer> data;
private Database dc;
private PreparedStatement query;
Connection c;
@Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
dc = new Database();
}
@FXML
public void showOnClick(){
dc = new Database();
c = dc.Connect();
try{
Retailer staff=(Retailer)tableUser.getSelectionModel().getSelectedItem();
String querySelect="SELECT * from Staff";
System.out.println(querySelect);
System.out.println(query);
System.out.println(c);
System.out.println(staff);
query=c.prepareStatement(querySelect);
userNameBox.setText(staff.getuserName());
firstNameBox.setText(staff.getfirstName());
lastNameBox.setText(staff.getlastName());
emailBox.setText(staff.getuserEmail());
salaryBox.setText(Integer.toString(staff.getSalary()));
query.close();
rs.close();
}
catch(SQLException e){
System.out.println("SQL wrong");
}
}
FXML代码
<AnchorPane id="AnchorPane" prefHeight="500.0" prefWidth="616.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.StaffController">
<children>
<Label fx:id="label" layoutX="126" layoutY="120" minHeight="16" minWidth="69" />
<TableView fx:id="tableUser" layoutX="223.0" layoutY="74.0" onMouseClicked="#showOnClick" prefHeight="248.0" prefWidth="379.0">
<columns>
<TableColumn fx:id="columnuserName" prefWidth="75.0" text="User Name" />
<TableColumn fx:id="columnfirstName" prefWidth="75.0" text="First Name" />
<TableColumn fx:id="columnlastName" prefWidth="75.0" text="Last Name" />
<TableColumn fx:id="columnuserEmail" prefWidth="90.0" text="Email" />
<TableColumn fx:id="columnSalary" prefWidth="75.0" text="Salary" />
</columns>
</TableView>
<Label layoutX="239.0" layoutY="31.0" prefHeight="27.0" prefWidth="138.0" text="Staff">
<font>
<Font size="18.0" />
</font>
</Label>
<Button fx:id="btnLoad" layoutX="442.0" layoutY="347.0" mnemonicParsing="false" onAction="#loadDataFromDatabase" prefHeight="25.0" prefWidth="145.0" text="LOAD DETAILS" />
<TextField id="userNameBox" layoutX="73.0" layoutY="95.0" prefHeight="25.0" prefWidth="112.0" promptText="User Name" />
<TextField id="firstNameBox" layoutX="73.0" layoutY="137.0" prefHeight="25.0" prefWidth="112.0" promptText="First Name" />
<TextField id="lastNameBox" layoutX="73.0" layoutY="179.0" prefHeight="25.0" prefWidth="112.0" promptText="Last Name" />
<TextField id="emailBox" layoutX="70.0" layoutY="225.0" prefHeight="25.0" prefWidth="112.0" promptText="Email" />
<TextField id="salaryBox" layoutX="73.0" layoutY="276.0" prefHeight="25.0" prefWidth="112.0" promptText="Salary" />
<Button id="addButton" layoutX="161.0" layoutY="310.0" mnemonicParsing="false" onAction="#AddStaff" text="Add" />
<Label layoutX="106.0" layoutY="58.0" text="Add new User" />
<Label layoutX="14.0" layoutY="99.0" text="User Name" />
<Label layoutX="14.0" layoutY="141.0" text="First Name" />
<Label layoutX="14.0" layoutY="183.0" text="Last Name" />
<Label layoutX="14.0" layoutY="229.0" text="Email" />
<Label layoutX="14.0" layoutY="280.0" text="Salary" />
<Circle id="deleteButton" fill="RED" layoutX="208.0" layoutY="116.0" radius="12.0" stroke="BLACK" strokeType="INSIDE" />
<Rectangle id="deleteButton" arcHeight="5.0" arcWidth="5.0" fill="#f5f5f5" height="8.0" layoutX="202.0" layoutY="112.0" stroke="BLACK" strokeType="INSIDE" width="13.0" />
</children>
</AnchorPane>
错误代码
Apr 30, 2017 6:52:55 PM javafx.fxml.FXMLLoader$ValueElement processValue
WARNING: Loading FXML document with JavaFX API of version 8.0.111 by JavaFX runtime of version 8.0.101
Sun Apr 30 18:53:04 BST 2017 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$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$MouseEventNotification.run(GlassViewEventHandler.java:380)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
... 31 more
Caused by: java.lang.NullPointerException
at application.Retailer.<init>(Retailer.java:28)
at application.StaffController.showOnClick(StaffController.java:100)
... 41 mor
ë
答案 0 :(得分：0)
按照该代码和tableview上的javafx教程检查How to get clicked row：
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;
import javafx.scene.control.TableRow;
import javafx.scene.input.MouseButton;
public class textRow extends Application {
private TableView<Person> table = new TableView<Person>();
private final ObservableList<Person> data =
FXCollections.observableArrayList(
new Person("Jacob", "Smith", "jacob.smith@example.com"),
new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
new Person("Ethan", "Williams", "ethan.williams@example.com"),
new Person("Emma", "Jones", "emma.jones@example.com"),
new Person("Michael", "Brown", "michael.brown@example.com")
);
private final TextField rowData= new TextField();
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
Scene scene = new Scene(new Group());
stage.setTitle("Table View Sample");
stage.setWidth(450);
stage.setHeight(550);
final Label label = new Label("Address Book");
label.setFont(new Font("Arial", 20));
table.setEditable(true);
TableColumn firstNameCol = new TableColumn("First Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("firstName"));
TableColumn lastNameCol = new TableColumn("Last Name");
lastNameCol.setMinWidth(100);
lastNameCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("lastName"));
TableColumn emailCol = new TableColumn("Email");
emailCol.setMinWidth(200);
emailCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("email"));
table.setItems(data);
table.getColumns().addAll(firstNameCol, lastNameCol, emailCol);
table.setRowFactory(tv -> {
TableRow<Person> row = new TableRow<>();
row.setOnMouseClicked(event -> {
if (! row.isEmpty() && event.getButton()==MouseButton.PRIMARY) {
Person clickedRow = row.getItem();
rowData.setText(clickedRow.toString());
}
});
return row ;
});
final VBox vbox = new VBox();
vbox.setSpacing(5);
vbox.setPadding(new Insets(10, 0, 0, 10));
vbox.getChildren().addAll(label, table, rowData);
((Group) scene.getRoot()).getChildren().addAll(vbox);
stage.setScene(scene);
stage.show();
}
public static class Person {
private final SimpleStringProperty firstName;
private final SimpleStringProperty lastName;
private final SimpleStringProperty email;
private Person(String fName, String lName, String email) {
this.firstName = new SimpleStringProperty(fName);
this.lastName = new SimpleStringProperty(lName);
this.email = new SimpleStringProperty(email);
}
public String getFirstName() {
return firstName.get();
}
public void setFirstName(String fName) {
firstName.set(fName);
}
public String getLastName() {
return lastName.get();
}
public void setLastName(String fName) {
lastName.set(fName);
}
public String getEmail() {
return email.get();
}
public void setEmail(String fName) {
email.set(fName);
}
public String toString(){
return "Name: "+firstName.get()+" "+lastName.get()+ " Email: "+email.get();
}
}
}