我有兩個(gè)控制器FXMLDocumentController有TableView客戶表。NewCustomerController第二個(gè)控制器添加新行。這是我的代碼FXML文檔.fxml<AnchorPane id="AnchorPane" prefHeight="283.0" prefWidth="437.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="mytableview.FXMLDocumentController"> <children> <Button fx:id="button" layoutX="309.0" layoutY="25.0" onAction="#handleButtonAction" text="New Customer" /> <TableView fx:id="customerTable" layoutX="6.0" layoutY="61.0" prefHeight="215.0" prefWidth="426.0"> <columns> <TableColumn fx:id="custname" prefWidth="75.0" text="Customer Name" /> <TableColumn fx:id="city" prefWidth="75.0" text="City" /> </columns> <columnResizePolicy> <TableView fx:constant="CONSTRAINED_RESIZE_POLICY" /> </columnResizePolicy> </TableView> </children></AnchorPane> 新客戶.fxml<AnchorPane id="AnchorPane" prefHeight="172.0" prefWidth="209.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.171" fx:controller="com.newcustomer.NewCustomerController"> <children> <Button layoutX="141.0" layoutY="129.0" mnemonicParsing="false" onAction="#newCustomer" text="Add" /> <TextField fx:id="cNameTextField" layoutX="14.0" layoutY="26.0" promptText="Customer Name" /> <TextField fx:id="custCityTextField" layoutX="14.0" layoutY="77.0" promptText="City" /> </children></AnchorPane>FXMLDocumentController.javapublic class FXMLDocumentController implements Initializable {private FXMLDocumentController documentController; //updated@FXMLpublic TableView<Customer> customerTable;@FXMLpublic TableColumn<Customer, String> custname;@FXMLpublic TableColumn<Customer, String> city; @Overridepublic void initialize(URL url, ResourceBundle rb) { //updated custname.setCellValueFactory(new PropertyValueFactory<>("name")); city.setCellValueFactory(new PropertyValueFactory<>("city")); }
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談到您的實(shí)際問題，我注意到您的代碼中存在三個(gè)問題。
關(guān)于您在 newCustomer() 方法中獲得的 NPE，您啟動(dòng)了 FXMLLoader 實(shí)例但未加載它。因此 getController() 為 null。要解決此問題，您需要在調(diào)用 getController() 之前先調(diào)用 load() 方法。
public void newCustomer(ActionEvent e) throws IOException {
? ? String name = cNameTextField.getText();
? ? String stringCity = custCityTextField.getText();
? ? Customer customer = new Customer(10, name, stringCity);
? ? FXMLLoader fXMLLoader = new FXMLLoader(getClass().getResource("/mytableview/FXMLDocument.fxml"));
? ? fXMLLoader.load(); // YOU ARE MISSING THIS LINE
? ? FXMLDocumentController fXMLDocumentController = fXMLLoader.<FXMLDocumentController>getController();
? ? fXMLDocumentController.inflateUI(customer); // Getting NPE at this line.
}
然而，上述修復(fù)是無用的，因?yàn)槟趧?chuàng)建一個(gè)未被使用的 FXMLDocumentController 的新實(shí)例（如 @kleopatra 指定的）。您必須實(shí)際傳遞要與之通信的控制器實(shí)例。您需要在 NewCustomerController 中創(chuàng)建該控制器的實(shí)例變量并設(shè)置它。
@FXML
private void handleButtonAction(ActionEvent event) throws IOException {
? ? FXMLLoader fXMLLoader = new FXMLLoader(getClass().getResource("/com/newcustomer/NewCustomer.fxml"));
? ? Parent parent = fXMLLoader.load();
? ? NewCustomerController controller = fXMLLoader.getController();
? ? controller.setFXMLDocumentController(this); // Pass this controller to NewCustomerController
? ? Stage stage = new Stage();
? ? Scene scene = new Scene(parent);
? ? stage.setScene(scene);
? ? stage.show();
}
NewCustomerController.java
private FXMLDocumentController fXMLDocumentController;
public void setFXMLDocumentController(FXMLDocumentController fXMLDocumentController) {
? ? this.fXMLDocumentController = fXMLDocumentController;
}
public void newCustomer(ActionEvent e) throws IOException {
? ? String name = cNameTextField.getText();
? ? String stringCity = custCityTextField.getText();
? ? Customer customer = new Customer(10, name, stringCity);
? ? fXMLDocumentController.inflateUI(customer);//You are passing to the currently loaded controller
}
最后，您只需將 CellValueFactory 設(shè)置到 TableColumns 一次，而不是每次設(shè)置客戶時(shí)。您可以將這兩行移動(dòng)到initialize() 方法。
@Override
public void initialize(URL url, ResourceBundle rb) {
? ? custname.setCellValueFactory(new PropertyValueFactory<>("name"));
? ? city.setCellValueFactory(new PropertyValueFactory<>("city"));
}
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