将数据添加到JavaFX tableview中

Question

我试图将我从RethinkDB获取的数据推送到JavaFx TableView，但是，这些更改没有出现在tableview中，我无法弄清楚原因。< / p>

我对JavaFx很陌生，所以我希望你能帮助我。

以下是我的课程:(我没有包含我从数据库保存数据的内存类）

RethinkDBConnect类

public class RethinkDBConnect {

    public static final RethinkDB r = RethinkDB.r;
    GsonConverter con = new GsonConverter();    
    JiraTicketBody body = new JiraTicketBody();
    ViewController viewcon = new ViewController();
    TicketDataProperty tickprop = new TicketDataProperty(null, null, null, null, null, null);

    public void Connection(){

        viewcon.list.add(newTicketDataProperty
            ("test","test","test","test","test","test"));
    }
}

TicketDataProperty类

public class TicketDataProperty {

    private final SimpleStringProperty key;
    private final SimpleStringProperty prioritaet;
    private final SimpleStringProperty erstellt;
    private final SimpleStringProperty status;
    private final SimpleStringProperty zustand;
    private final SimpleStringProperty beschreibung;

    public TicketDataProperty(String key, String prioritaet, String erstellt,
            String status, String zustand, String beschreibung)
    {
        this.key = new SimpleStringProperty(key);
        this.prioritaet = new SimpleStringProperty(prioritaet);
        this.erstellt = new SimpleStringProperty(erstellt);
        this.status = new SimpleStringProperty(status);
        this.zustand = new SimpleStringProperty(zustand);
        this.beschreibung = new SimpleStringProperty(beschreibung);
    }

    public String getKey() {
        return key.get();
    }

    public void setKey(String value) {
        key.set(value);
    }

    public String getPrioritaet() {
        return prioritaet.get();
    }

    public void setPrioritaet(String value) {
        prioritaet.set(value);
    }

    public String getErstellt() {
        return erstellt.get();
    }

    public void setErstellt(String value) {
        erstellt.set(value);
    }

    public String getStatus() {
        return status.get();
    }

    public void setStatus(String value) {
        status.set(value);
    }

    public String getZustand() {
        return zustand.get();
    }

    public void setZustand(String value) {
        zustand.set(value);
    }

    public String getBeschreibung() {
        return beschreibung.get();
    }

    public void setBeschreibung(String value) {
        beschreibung.set(value);
    }   
}

ViewController类

public class ViewController implements Initializable {

    TicketDataProperty tickdat = new TicketDataProperty(null, null, null, null, null, null);

    @FXML private TableView <TicketDataProperty> table;
    @FXML private TableColumn <TicketDataProperty,String> key;
    @FXML private TableColumn <TicketDataProperty,String> prioritaet;
    @FXML private TableColumn <TicketDataProperty,String> erstellt;
    @FXML private TableColumn <TicketDataProperty,String> status;
    @FXML private TableColumn <TicketDataProperty,String> zustand;
    @FXML private TableColumn <TicketDataProperty,String> beschreibung;

    public ObservableList<TicketDataProperty> list = FXCollections.observableArrayList(
            new TicketDataProperty("example","example","example","example","example","example")
            );

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        key.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("key"));
        prioritaet.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("prioritaet"));
        erstellt.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("erstellt"));
        status.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("status"));
        zustand.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("zustand"));
        beschreibung.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("beschreibung"));
        table.setItems(list);
    }
}

GsonConverter类

public class GsonConverter {

    public JiraTicketBody gson(String json) 
    {
        Gson gson = new Gson();
        JiraTicketBody BodyObj = gson.fromJson(json,JiraTicketBody.class);
        return BodyObj;
    }
}

主要课程

public class Main extends Application 
{

    //ViewXML
    @Override
    public void start(Stage primaryStage) throws IOException 
    {
        Parent root = FXMLLoader.load(getClass().getResource("/view/ViewXML.fxml"));
        Scene scene = new Scene(root);
        primaryStage.setTitle("Ticket System Application");
        primaryStage.setScene(scene);
        primaryStage.sizeToScene();
        primaryStage.show();
    }

    public static void main(String[] args) 
    {
        try {

            //ViewXML
            launch(args);

            RethinkDBConnect obj = new RethinkDBConnect();
            obj.Connection();
        } catch(Exception e) {

        }
    }
}

Answer 1

您发布的代码存在两个问题。

1. 如documentation中所述，Application.launch()阻止，直到应用程序退出。因此，在应用程序处于关闭过程之前，您甚至不会创建RethinkDBConnection类。您应该将start()方法视为应用程序的入口点，并且launch()方法中除了main(...)之外不应该有任何代码。您在JavaFX应用程序中执行的任何操作都应该使用start(...)或init(...)方法，或从那里调用的方法等完成。

   在这种情况下，由于您似乎不需要来自控制器外部的RethinkDBConnection，我认为没有理由不从控制器本身创建RethinkDBConnect。

2. 您需要更新属于控制器的list。相反，您正在创建一个恰好与控制器相同的类的新对象，并更新属于该对象的列表。显然，该列表与表格没有任何关系。您需要将对用作表的支持列表的实际列表的引用传递给RethinkDBController实例。

所以你的代码应该是这样的：

public class RethinkDBConnection {

    // public static final RethinkDB r = RethinkDB.r;
    // GsonConverter con = new GsonConverter();    
    // JiraTicketBody body = new JiraTicketBody();

    private final ObservableList<TicketDataProperty> dataList ;

    public RethinkDBConnection(ObservableList<TicketDataProperty> dataList) {
        this.dataList = dataList ;
    }

    public void connect(){

        dataList.add(new TicketDataProperty
            ("test","test","test","test","test","test"));



    }
}

然后在控制器中你可以这样做：

public class ViewController implements Initializable {


    @FXML private TableView <TicketDataProperty> table;
    @FXML private TableColumn <TicketDataProperty,String> key;
    @FXML private TableColumn <TicketDataProperty,String> prioritaet;
    @FXML private TableColumn <TicketDataProperty,String> erstellt;
    @FXML private TableColumn <TicketDataProperty,String> status;
    @FXML private TableColumn <TicketDataProperty,String> zustand;
    @FXML private TableColumn <TicketDataProperty,String> beschreibung;

    private ObservableList<TicketDataProperty> list = FXCollections.observableArrayList(
            new TicketDataProperty("example","example","example","example","example","example")
            );

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        key.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("key"));
        prioritaet.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("prioritaet"));
        erstellt.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("erstellt"));
        status.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("status"));
        zustand.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("zustand"));
        beschreibung.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("beschreibung"));
        table.setItems(list);

        RethinkDBConnection connection = new RethinkDBConnection(list);
        connection.connect();
    }
}

您的Main课程应该是：

public class Main extends Application 
{

    //ViewXML
    @Override
    public void start(Stage primaryStage) throws IOException 
    {
        Parent root = FXMLLoader.load(getClass().getResource("/view/ViewXML.fxml"));
        Scene scene = new Scene(root);
        primaryStage.setTitle("Ticket System Application");
        primaryStage.setScene(scene);
        primaryStage.sizeToScene();
        primaryStage.show();
    }

    public static void main(String[] args) {

        launch(args);

    }
}

如果您确实需要访问控制器外的RethinkDBConnection实例，请按如下方式修改控制器：

public class ViewController implements Initializable {

    @FXML private TableView <TicketDataProperty> table;
    @FXML private TableColumn <TicketDataProperty,String> key;
    @FXML private TableColumn <TicketDataProperty,String> prioritaet;
    @FXML private TableColumn <TicketDataProperty,String> erstellt;
    @FXML private TableColumn <TicketDataProperty,String> status;
    @FXML private TableColumn <TicketDataProperty,String> zustand;
    @FXML private TableColumn <TicketDataProperty,String> beschreibung;

    private ObservableList<TicketDataProperty> list = FXCollections.observableArrayList(
            new TicketDataProperty("example","example","example","example","example","example")
            );

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        key.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("key"));
        prioritaet.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("prioritaet"));
        erstellt.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("erstellt"));
        status.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("status"));
        zustand.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("zustand"));
        beschreibung.setCellValueFactory(new PropertyValueFactory<TicketDataProperty,String>("beschreibung"));
        table.setItems(list);

    }

    public ObservableList<TicketDataProperty> getDataList() {
        return list ;
    }
}

并使用此版本的Main：

public class Main extends Application 
{

    //ViewXML
    @Override
    public void start(Stage primaryStage) throws IOException 
    {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("/view/ViewXML.fxml"));
        Parent root = loader.load();

        ViewController controller = loader.getController();
        RethinkDBConnection connection = new RethinkDBConnection(controller.getDataList());
        connection.connect();

        Scene scene = new Scene(root);
        primaryStage.setTitle("Ticket System Application");
        primaryStage.setScene(scene);
        primaryStage.sizeToScene();
        primaryStage.show();
    }

    public static void main(String[] args) {

        launch(args);

    }
}

请注意，我重命名了一些类和方法以遵守标准naming conventions。