用户界面 - Javafx Tableview 不显示 ObservableList 的数据

Question

我在JavaFX中的表视图有问题。我知道论坛中还有其他一些帖子，但我检查了它们并尝试使用这些解决方案，但对我来说没有任何用处......我有3节课。一个版本类，即数据模型。将数据填充到表视图的类，以及加载表并在 UI 中显示的类。你能看出我做错了什么吗？

版本类（表的数据模型）

public class Version {
private final SimpleStringProperty aktVer;
private final SimpleStringProperty produktDate;
private final SimpleStringProperty aktVerForCustom;
private final SimpleStringProperty lastVer;
private final SimpleStringProperty lastVerForCustom;
private final SimpleStringProperty runOut;
Version(String aktVer, String produktDate, String aktVerForCustom, String lastVer, String lastVerForCustom, String runOut) {
    this.aktVer = new SimpleStringProperty(aktVer);
    this.produktDate = new SimpleStringProperty(produktDate);
    this.aktVerForCustom = new SimpleStringProperty(aktVerForCustom);
    this.lastVer = new SimpleStringProperty(lastVer);
    this.lastVerForCustom = new SimpleStringProperty(lastVerForCustom);
    this.runOut = new SimpleStringProperty(runOut);
}
public String getAktVer() {
    return aktVer.get();
}
public void setAktVer(String aktVer) {
    this.aktVer.set(aktVer);
}
public String getProduktDate() {
    return produktDate.get();
}
public void setProduktDate(String produktDate) {
    this.produktDate.set(produktDate);
}
public String getAktVerForCustom() {
    return aktVerForCustom.get();
}
public void setAktVerForCustom(String aktVerForCustom) {
    this.aktVerForCustom.set(aktVerForCustom);
}
public String getLastVer() {
    return lastVer.get();
}
public void setLastVer(String lastVer) {
    this.lastVer.set(lastVer);
}
public String getLastVerForCustom() {
    return lastVerForCustom.get();
}
public void setLastVerForCustom(String lastVerForCustom) {
    this.lastVerForCustom.set(lastVerForCustom);
}
public String getRunOut() {
    return runOut.get();
}
public void setRunOut(String runOut) {
    this.runOut.set(runOut);
}
public void print(){
    System.out.println("Daten:"+aktVer+"  "+produktDate+"  "+aktVerForCustom+"  "+lastVer+"  "+lastVerForCustom+"  "+runOut);
}
}

表

类：（用数据填充表）

public class VersionsManagerTabelController implements Initializable {
Connection con = null;
Statement st = null;
ResultSet rs = null;
ControllerManager cm = new ControllerManager(); 
DatabaseConnector dc = DatabaseConnector.getInstance();
ObservableList<Version> versionen = FXCollections.observableArrayList();
@FXML
TableColumn tc_aktVer;
@FXML
TableColumn tc_produktDate;
@FXML
TableColumn tc_aktVerForCustom;
@FXML
TableColumn tc_lastVer;
@FXML
TableColumn tc_lastVerForCustom;
@FXML
TableColumn tc_runOut;
@FXML
TableView tv_versions;
public void populateDataForTableView(String product) throws SQLException{
    if(product.matches("toolstarLX")){
        versionen.removeAll(versionen);
        con = dc.getConnectionToDB();
        st = con.createStatement();
        rs = st.executeQuery("SELECT * FROM testlx");
        if (rs.next()) {
            String ver = rs.getString("akt_ver");
            String pd = rs.getString("produkt_datum");
            String ak = rs.getString("an_kunden");
            String laver = rs.getString("letzte_ver");
            String lvforcustom = rs.getString("lv_an_kunden");
            String runout = rs.getString("lauft_ab_am");
            versionen.add(new Version(ver, pd, ak, laver, lvforcustom, runout));
            versionen.get(0).print();
        }

        tv_versions.setItems(versionen);
    }
}
@Override
public void initialize(URL url, ResourceBundle rb) {;
tc_aktVer.setCellValueFactory(new PropertyValueFactory<Version, String>("aktVer"));
}    
}

表

类：（仅加载内容并显示表的方法）

@FXML
private void showLxTabel(ActionEvent event) {
    try {
        cm.setProduct(lx);
        tableCont.populateDataForTableView(cm.getProduct());
        AnchorPane root=null;
        try {
            root = FXMLLoader.load(getClass().getResource("VersionsManagerTabel.fxml"));
        } catch (IOException ex) {}
        ap_tabelContent.getChildren().clear();
        ap_tabelContent.getChildren().add(root);
        lbl_prduct_overview.setText(lx);
    } catch (SQLException ex) {Logger.getLogger(VersionsManagerMainController.class.getName()).log(Level.SEVERE, null, ex);
}
}

这是FXML：

<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<AnchorPane prefHeight="440.0" prefWidth="598.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="toolhouseversionsmanager.VersionsManagerTabelController">
   <children>
      <TableView fx:id="tv_versions" layoutX="14.0" layoutY="14.0" prefHeight="413.0" prefWidth="570.0">
        <columns>
          <TableColumn fx:id="tc_aktVer" prefWidth="76.0" text="akt. Version" />
          <TableColumn fx:id="tc_produktDate" prefWidth="117.0" text="Produktionsdatum" />
            <TableColumn fx:id="tc_aktVerForCustom" prefWidth="113.0" text="akt Ver. an Kunden" />
            <TableColumn fx:id="tc_lastVer" minWidth="0.0" prefWidth="96.0" text="letzte Version" />
            <TableColumn fx:id="tc_lastVerForCustom" prefWidth="127.0" text="letz. Ver. an Kunden" />
            <TableColumn fx:id="tc_runOut" prefWidth="127.0" text="läuft ab am" />
        </columns>
         <columnResizePolicy>
            <TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
         </columnResizePolicy>
      </TableView>
   </children>
</AnchorPane>

这是我获取控制器的代码。我经常遇到控制器及其引用的问题，但使用这种方法它效果很好（直到现在？？在其他类中，我创建了一个新变量，例如VersionsManagerTableController example = ControllerManager.getTableController()

public class ControllerManager {
//Enthält den String des momentan ausgeählten Produkts (für Erstellen, löschen und bearbeiten von Einträgen
//in der Datenbank
StringProperty product = new SimpleStringProperty();
public String getProduct(){
    return product.get();
}
public void setProduct(String product){
    this.product.set(product);
}
public StringProperty productProperty(){
    return product;
}
//Gibt eine Referenz auf den Controller von VersionsManagerNew.fxml (Neuen Eintrag anlegen)
public VersionsManagerNewController getNewEntryController() throws IOException{
    FXMLLoader fxmlLoader = new FXMLLoader();
    Pane p = fxmlLoader.load(getClass().getResource("VersionsManagerNew.fxml").openStream());
    VersionsManagerNewController controller = (VersionsManagerNewController) fxmlLoader.getController();
    return controller;
}
public VersionsManagerTabelController getTableController() throws IOException{
    FXMLLoader fxmlLoader = new FXMLLoader();
    Pane p = fxmlLoader.load(getClass().getResource("VersionsManagerTabel.fxml").openStream());
    VersionsManagerTabelController controller = (VersionsManagerTabelController) fxmlLoader.getController();
    return controller;
}
}

Answer 1

你对VersionsManagerTabelController的引用，tableCont ，不是指控制你实际显示的 UI 的同一个控制器实例。您的showLxTabel方法应如下所示（我不知道您在此处的所有方法调用都做了什么，因为您没有发布完整的示例，但这应该可以解决眼前的问题）：

@FXML
private void showLxTabel(ActionEvent event) {
    try {
        cm.setProduct(lx);
        // tableCont.populateDataForTableView(cm.getProduct());
        AnchorPane root=null;
        try {
            FXMLLoader loader = new FXMLLoader(getClass().getResource("VersionsManagerTabel.fxml"));
            root = loader.load();
            VersionsManagerTabelController tableController = loader.getController();
            tableController.populateDataForTableView(cm.getProduct());
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        ap_tabelContent.getChildren().clear();
        ap_tabelContent.getChildren().add(root);
        lbl_prduct_overview.setText(lx);
    } catch (SQLException ex) {Logger.getLogger(VersionsManagerMainController.class.getName()).log(Level.SEVERE, null, ex);
}