我有一个非常简单的类,它接受一个作业列表并尝试用它们填充TableView . 我没有使用FXML,但我正在尝试新的方法 . 我的问题是;
tView.getItems().addAll(jobList);
返回一个空指针,但是如果我创建一个新的TableView,表中根本就没有数据 .
我相信我出错的地方是使用在SceneBuilderand中构造的TableView并没有正确地初始化它,但是我对如何做到这一点很困惑 . 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课程;
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;
}
}
2 回答
例如,您的FXML部分是: -
1)为您的FXML页面创建一个控制器,如: -
2)现在在您的控制器中,您可以这样做: -
所有@FXML带注释的控制器类字段都由FXMLLoader实例化,同时加载
fx:controller
等于该控制器类的fxml文件或由fxmlLoader.setController()设置的类 . 如果您自己实例化控制器类,则这些@FXML带注释的字段将为null . 所以这里是在fxml文件中使用setController()而不是fx:controller的示例方法:MainApp
MainController
Main.fxml
InterfaceMethods
请注意,Main.fxml和TableViewInterface.fxml中没有
fx:controller
.