JavaFX TableView 与 SceneBuilder

Question

我有一个非常简单的类，它获取作业列表并尝试用它们填充 TableView。我在不使用 FXML 的情况下完成了这项工作，但我现在正在尝试新方法。我遇到的问题是；

tView.getItems().addAll(jobList);

返回一个空指针，但是如果我创建一个新的 TableView，则表中根本没有数据。

我相信我出错的地方是使用了在 SceneBuilder 中构造的 TableView 并且没有正确初始化它，但是我对如何执行此操作感到困惑。这是我的 InterFace 方法类；

public class InterfaceMethods {

    @FXML TableView<Job> tView;

    @SuppressWarnings("unchecked")
    public void populateTableView(Connection connection, Stage stage) throws Exception {

        Parent root;
        root = FXMLLoader.load(getClass().getResource("TableViewInterface.fxml"));
        Scene scene = new Scene(root);
        stage.setScene(scene);

        JobDataAccessor jobAccessor = new JobDataAccessor();
        final String query = "SELECT * FROM progdb.adamJobs";
        List<Job> jobList = jobAccessor.getJobList(connection, query);
        //System.out.println(query);
        //System.out.println(connection);
        tView.getItems().addAll(jobList);
    }
}

这是我的 MainApp 类；

public class MainApp extends Application {

private CheckUserDetails checkDetails;
private String pString, username = System.getProperty("user.name");
private InterfaceMethods iMethods;
private Connection connection;
@FXML private Button submitButton;
@FXML private PasswordField passField;
@FXML private Label warnLabel;

@Override
public void start(Stage stage) throws Exception {
    Parent root = FXMLLoader.load(getClass().getResource("MainInterface.fxml"));
    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.show();
}

@FXML
private void loginCheck() throws Exception {
    checkDetails = new CheckUserDetails();
    pString = new String();
    pString = passField.getText();
    System.out.println(pString);
    if (checkDetails.checkUserDetails(pString, username) != null) {
        setConnection(checkDetails.connection);
        handleTableView();
    } else {
        warnLabel.setVisible(true);
    }
}

@FXML
public void handleTableView() throws Exception {
    iMethods = new InterfaceMethods();

    Stage stage = (Stage) submitButton.getScene().getWindow();  

    connection = getConnection();

    iMethods.populateTableView(connection, stage);
}

public static void main(String[] args) {
    launch(args);
}

最后这是我的两个 FXML 文件之一，其中包含 TableView；

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.GridPane?>

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.40" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.InterfaceMethods">
   <children>
      <TableView fx:id="tView" layoutX="17.0" layoutY="19.0" prefHeight="347.0" prefWidth="570.0">
        <columns>
          <TableColumn prefWidth="75.0" text="CaseNO." />
          <TableColumn prefWidth="75.0" text="Case Notes" />
            <TableColumn prefWidth="75.0" text="Date Created" />
            <TableColumn prefWidth="75.0" text="Deadline" />
            <TableColumn prefWidth="75.0" text="Priority" />
            <TableColumn prefWidth="75.0" text="Completed" />
        </columns>
         <columnResizePolicy>
            <TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
         </columnResizePolicy>
      </TableView>
   </children>
</AnchorPane>

getJobList 方法(在不同的类中)；

    public List<Job> getJobList(final Connection connection, final String query) throws SQLException {
    try (Statement stmnt = connection.createStatement(); ResultSet rs = stmnt.executeQuery(query);) {
        jobList = new ArrayList<>();
        System.out.println(connection);
        System.out.println(query);
        while (rs.next()) {
            caseNumber = rs.getString("CaseNO");
            caseNotes = rs.getString("CaseNotes");
            dateCreated = rs.getString("DateCreated");
            deadlineDate = rs.getString("Deadline");
            prioritySetting = rs.getInt("Priority");
            completedSetting = rs.getString("Completed");
            job = new Job(caseNumber, caseNotes, dateCreated, deadlineDate, prioritySetting, completedSetting);
            jobList.add(job);
        }
        return jobList;
    }
}

Answer 1

You need to define the controller for your FXML.

例如，您的 FXML 部分是:-

<AnchorPane id="AnchorPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="288.0" prefWidth="293.0" xmlns:fx="http://javafx.com/fxml">
<children>
    <TableView fx:id="tableView" layoutX="35.0" layoutY="28.0" prefHeight="200.0" prefWidth="227.0">
    <columns>
        <!-- Columns for table view-->
    </columns>
    </TableView>
</children>
</AnchorPane>

1) 为您的 FXML 页面创建一个 Controller ，例如:-

 fx:controller="com.code.Controller"

2)现在在您的 Controller 中，您可以执行以下操作:-

package com.code;

    public class Controller implements Initializable {

        @FXML private TableView<User> tableView;