使用视图对象在控制器之间传递值 - JavaFX

Question

使用 Gluon 插件为 Ecplise、Netbeans 或 Intellij 生成多视图项目时。它将生成一个视图类和一个演示者类。例如，视图类如下所示：

public class ModelsView {

    public View getView() {
        try {
            View view = FXMLLoader.load(ModelsView.class.getResource("models.fxml"));
            return view;
        } catch (IOException e) {
            System.out.println("IOException: " + e);
            return new View();
        }
    }
}

有没有什么方法可以访问这个控制器models.fxml 中的所有私有字段，只需创建如下代码行：

View view = new ModelsView().getView(); // Here I am inside another controller

我可以使用view 对象从presenter-class 访问例如getter 方法吗？正如我所见，view 对象是静态的，因为在FXMLLoader.load(URL location) 之前没有new

    public class ModelsPresenter {

    @FXML
    private View models;

    @FXML
    private @Getter TableView<String> tableView;

    public void initialize() {

    }
}

Answer 1

异端 我没有使用来自 Gluon 的 JavaFX 我的配置是 jdk1.8.0_191 和 Netbeans 8.2 中的 derby 我发布的代码是我的模型类 PWData 并且 TableViewController 只是从 derby DB 中获取数据真正重要的代码是初始化 TableViewController 部分

public class PWData {

    private final StringProperty ID;
    private final StringProperty website;
    private final StringProperty un;
    private final StringProperty pw;
    private final StringProperty sq;
    private final StringProperty sans;
    private final StringProperty notes;

    public PWData(String ID,String website,String un,String pw,String sq,String sans,String notes) {
        this.ID = new SimpleStringProperty(ID);
        this.website = new SimpleStringProperty(website);
        this.un = new SimpleStringProperty(un);
        this.pw = new SimpleStringProperty(pw);
        this.sq = new SimpleStringProperty(sq);
        this.sans = new SimpleStringProperty(sans);
        this.notes = new SimpleStringProperty(notes);
    }

    public String getID() {// 0
        return ID.get();
    }
    public void setID(String ID){// 0
        this.ID.set(ID);
    }
    public StringProperty IDProperty(){// 0
        return ID;
    }

    public String getWebSite() {// 1
        return website.get();
    }
    public void setwebsite(String website){// 1
        this.website.set(website);
    }
    public StringProperty websiteProperty(){// 1
        return website;
    }

    public String getUNName() {// 2
        return un.get();
    }
    public void setun(String un){// 2
        this.un.set(un);
    }
    public StringProperty unProperty(){// 2
        return un;
    }

    public String getPW() {// 3
        return pw.get();
    }
    public void setpw(String pw){// 3
        this.pw.set(pw);
    }
    public StringProperty pwProperty(){// 3
        return pw;
    }

    public String getSQName() {// 4
        return sq.get();
    }
    public void setsq(String sq){// 4
        this.sq.set(sq);
    }
    public StringProperty sqProperty(){// 4
        return sq;
    }

    public String getSANS() {// 5
        return sans.get();
    }
    public void setsans(String sans){// 5
        this.sans.set(sans);
    }
    public StringProperty sansProperty(){// 5
        return sans;
    }

    public String getNotes() {// 6
        return notes.get();
    }
    public void setnotes(String notes){// 6
        this.notes.set(notes);
    }
    public StringProperty notesProperty(){// 6
        return notes;
    }

public class TableViewController implements Initializable {

@FXML Pane tableviewPane,signinPane,detailviewPane;
@FXML private TableView<PWData> table;// NOTE CONSTRUCTION see Observable Value
@FXML private TableColumn<PWData,String> IDCol;
@FXML private TableColumn<PWData,String> websiteCol;
@FXML private TableColumn<PWData,String> unCol;
@FXML private TableColumn<PWData,String> pwCol;


String SQL_PWDataTable = "create table PWData ("
+ "ID     int not null generated always as identity "
+ "         (start with 100,increment by 1),"
+ "website  varchar(50) not null, un varchar(40) not null, "
+ "pw  varchar(40) not null, sq varchar(80) not null, "
+ "sans varchar(80) not null, notes varchar(260) not null,"
+ "primary key (ID) )";

String dbName="PWKeep";
public Stage stage;
String conURL = "jdbc:derby:C:/A_DerbyPWKeeper/DBName/" + dbName;
public static String strID;
KeyCode kc;

@FXML
private void onPress(KeyEvent ev) throws IOException{
    kc = ev.getCode();
    if(kc == KeyCode.ESCAPE){
        onBack(null);
    }   
}

private void MakeTable() throws SQLException, IOException{
    if (!tableExists( SignInController.con, "PWData")){
        //System.out.println ("Creating table PWData");
        SignInController.stmnt = SignInController.con.createStatement();
        SignInController.stmnt.execute(SQL_PWDataTable );
        SignInController.stmnt.close();
    }else{
        //System.out.println("PWData already created");
    }
    ReadFromDB();
}

// Does the table EXISTS 
private static boolean tableExists ( Connection con, String table ) {
    int numRows = 0;

    try {
        DatabaseMetaData dbmd = con.getMetaData();
        // Note the args to getTables are case-sensitive!
        ResultSet rs = dbmd.getTables( null, "APP", table.toUpperCase(), null);
    while( rs.next()) ++numRows;

    }catch(SQLException e){
        String theError = e.getSQLState();
        System.out.println("Can't query DB metadata: " + theError );
        System.exit(1);
    }
        return numRows > 0;
}

private void ReadFromDB() throws SQLException{
    SignInController.stmnt = SignInController.con.createStatement();
    ObservableList<PWData> TableData = FXCollections.observableArrayList();
    try (ResultSet rs = SignInController.stmnt.executeQuery("SELECT * FROM PWData") // Get all DB data
    //int rowCount = 0;
    ) {
        while (rs.next()){// Add data to observableArrayList TableData
            //rowCount++;
            TableData.add(new PWData(rs.getString("ID"),rs.getString("website")
                    ,rs.getString("un"),rs.getString("pw"),rs.getString("sq"),rs.getString("sans"),rs.getString("notes")));
        }   //System.out.println("Row Count "+rowCount);// Useful for Printing for further development

        PropertyValueFactory<PWData, String> IDCellValueFactory = new PropertyValueFactory<>("ID");
        IDCol.setCellValueFactory(IDCellValueFactory);
        PropertyValueFactory<PWData, String> WebSiteCellValueFactory = new PropertyValueFactory<>("website");
        websiteCol.setCellValueFactory(WebSiteCellValueFactory);
        PropertyValueFactory<PWData, String> UNCellValueFactory = new PropertyValueFactory<>("un");
        unCol.setCellValueFactory(UNCellValueFactory);
        PropertyValueFactory<PWData, String> PWCellValueFactory = new PropertyValueFactory<>("pw");
        pwCol.setCellValueFactory(PWCellValueFactory);
        Collections.sort(TableData, (p1, p2)-> p1.getWebSite().compareToIgnoreCase(p2.getWebSite()));
        // Line of Code above Sorts websiteCol alpha
        if(TableData.size() < 14) {// Format TableView to display Vertical ScrollBar
            table.setPrefWidth(838);
        }else {
            table.setPrefWidth(855);
        }   table.setItems(TableData);
        SignInController.stmnt.close();
    }
}

@FXML
private void onBack(ActionEvent e) throws IOException{

    stage = (Stage)tableviewPane.getScene().getWindow();
    signinPane = FXMLLoader.load(getClass().getResource("signin.fxml")); 
    Scene scene = new Scene(signinPane);
    scene.getStylesheets().add(getClass().getResource("pwkeeper.css").toExternalForm());
    stage.setScene(scene); 
    stage.show();
    stage.sizeToScene();
    stage.centerOnScreen();
}

@FXML 
private void onAdd(ActionEvent e) throws IOException{

    stage = (Stage)tableviewPane.getScene().getWindow();
    detailviewPane = FXMLLoader.load(getClass().getResource("detailview.fxml"));
    Scene scene = new Scene(detailviewPane);
    scene.getStylesheets().add(getClass().getResource("pwkeeper.css").toExternalForm());
    stage.setScene(scene); 
    stage.show();
    stage.sizeToScene();
    stage.centerOnScreen();
}

private void MakeConn() throws SQLException, IOException{
    SignInController.con = DriverManager.getConnection(conURL);
}

@FXML // This DROPS the MasterPW TABLE when the Reset Password is selected
private void onDrop(ActionEvent e) throws SQLException, IOException{
    SignInController.stmnt = SignInController.con.createStatement();
    SignInController.stmnt.executeUpdate("DROP TABLE MasterPW");
    SignInController.stmnt.close();
    onBack(null);
}

private void showTableDataDetails(PWData info) throws IOException{
    if (info != null) {
        info =  (PWData) table.getSelectionModel().getSelectedItem();
        strID = info.getID();
        onAdd(null);
    }
}

@Override
public void initialize(URL url, ResourceBundle rb) {
    try {
        MakeTable();
    } catch (SQLException | IOException ex) {
        Logger.getLogger(TableViewController.class.getName()).log(Level.SEVERE, null, ex);
    }
    table.getSelectionModel().selectedItemProperty().addListener((ObservableValue<? extends PWData>
        observable,PWData oldValue, PWData newValue) -> {
    try {
        showTableDataDetails((PWData) newValue); // When a row of the table is Selected call
        // Proper Construction                   // showTableDataDetails method  
    } catch (IOException ex) {
            Logger.getLogger(TableViewController.class.getName()).log(Level.SEVERE, null, ex);
    }
    });
}     

我有点不确定你想做什么，但我建议你专注于 ObservableValue 和 Listeners 的使用你可以下载整个代码
At GitHub HERE