JavaFX 8 : Populating a TableView in initialize method

Question

我是 JavaFX 8 的新手，我正在尝试使用初始化方法在 Controller 中为 TableView 提供一些数据。 我已经看到了很多关于它的话题，尝试了很多东西但它对我不起作用。 我见过:

• How to populate TableView dynamically with FXML and JavaFX
• How to populate a TableView that is defined in an fxml file that is designed in JavaFx Scene Builder
• Javafx PropertyValueFactory not populating Tableview

还有很多，但没有一个解决方案恰好适合我。

这是我的代码: 员工类

public class Employee extends Person{

private SimpleIntegerProperty salary;
private SimpleObjectProperty<Character> droit;

public Employee(){
    super();
    this.salary = new SimpleIntegerProperty();
    this.droit = new SimpleObjectProperty<Character>();
}

public Employee(int id, String firstName, String lastName, String password, char droits, int salary) {
    super(id,firstName,lastName,password);
    this.salary = new SimpleIntegerProperty(salary);
    this.droit = new SimpleObjectProperty<Character>(droits);
}

public Employee(String firstName, String lastName, String password, char droits, int salary) {
    super(firstName,lastName,password);
    this.salary = new SimpleIntegerProperty(salary);
    this.droit = new SimpleObjectProperty<Character>(droits);
}

...

}

类人

public class Person {

protected SimpleStringProperty firstName;
protected SimpleStringProperty lastName;

public Person(){
this.firstName = new SimpleStringProperty();
this.lastName = new SimpleStringProperty(); 

}

public Person(String firstName, String lastName){
    this.firstName = new SimpleStringProperty(firstName);
    this.lastName = new SimpleStringProperty(lastName);
}

public String getFirstName() {
    return firstName.get();
}

public void setFirstName(String firstName) {
    this.firstName.set(firstName);
}

public StringProperty firstNameProperty(){
    return this.firstName;
}

public String getLastName() {
    return this.lastName.get();
}

public void setLastName(String lastName) {
    this.lastName.set(lastName);
}

public StringProperty lastNameProperty(){
    return this.lastName;
}

这是定义用户界面的 FXML:

ConsultHR.fxml

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ButtonBar?>
<?import javafx.scene.control.DatePicker?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.StackPane?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Font?>

    <VBox fx:id="ConsultHR" maxHeight="600.0" maxWidth="600.0" minHeight="500.0" minWidth="500.0" prefHeight="550.0" prefWidth="550.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="fr.kaf.app.controller.hr.ConsultHRController">
        <children>
            <HBox maxHeight="450.0" minHeight="450.0" prefHeight="450.0">
                <children>
                    <TableView fx:id="table" prefHeight="426.0" prefWidth="288.0">
                        <columns>
                            <TableColumn fx:id="lastNameCol" prefWidth="131.0" text="Nom" />
                            <TableColumn fx:id="firstNameCol" prefWidth="154.0" text="Prénom" />
                        </columns>
                    </TableView>
                </HBox>
                    <ButtonBar prefHeight="40.0" prefWidth="400.0">
                        <buttons>
                            <Button mnemonicParsing="false" onAction="#goHRAction" text="Rssources Humaines" />
                        </buttons>
                        <VBox.margin>
                            <Insets right="15.0" />
                        </VBox.margin>
               </ButtonBar>
            </children>
        </VBox>

最后是 Controller : ** 类 ConsultHRController **

    public class ConsultHRController extends DefaultController implements Initializable{

    @FXML
    VBox ConsultHR;

    @FXML
    public TableView<Employee> table;

    @FXML
    TableColumn<Employee,String> firstNameCol;

    @FXML
    TableColumn<Employee,String> lastNameCol;

    DAO<Employee> dao;

    SimpleListProperty<Employee> employees;

    @Override
    public void initialize(URL location, ResourceBundle resources){
        super.initialize();
        dao = (DAO<Employee>) dFact.getEmployeeDAO();
        try {
            employees = dao.findAll();
            System.out.println(employees.get());    
            table =new TableView<Employee>(employees);
            firstNameCol.setCellValueFactory(new PropertyValueFactory<Employee, String>("firstName"));
            lastNameCol.setCellValueFactory(new PropertyValueFactory<Employee, String>("lastName"));
            table.getColumns().setAll(firstNameCol, lastNameCol);
            System.out.println(firstNameCol.getCellData(0));
        } catch (SQLException e) {
            // TODO Mettre une popup erreur base de données
            e.printStackTrace();
        }

    }

    public void goHRAction(ActionEvent e) throws IOException{
        goSmwhereAction((Stage) ConsultHR.getScene().getWindow(),"/fr/kaf/app/fxml/hr/HumanRessources.fxml");   
    }

}

如您所见，我有一个“System.out.println(firstNameCol.getCellData(0));”在初始化方法中。结果显示单元格不为空，并且填充了正确的数据，但我在 UI 中看不到任何内容。

Answer 1

您在 initialize 方法中替换了 TableView。

table =new TableView<Employee>(employees);

您将数据分配给新的 TableView 并将根据 fxml 创建的留空。

改为使用由 FXMLLoader 注入(inject)的那个:

@Override
public void initialize(URL location, ResourceBundle resources){
    super.initialize();
    dao = (DAO<Employee>) dFact.getEmployeeDAO();
    try {
        employees = dao.findAll();

        // set data for the table created by the FXMLLoader
        table.setItems(employees);

        // no need to add them to the table since the FXMLLoader is ready doing that
        firstNameCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));
        lastNameCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
    } catch (SQLException e) {
        // TODO Mettre une popup erreur base de données
        e.printStackTrace();
    }

}