我正在使用intelliJ构建一个简单的Inventory程序，我正在尝试从统计控制器（OnFloorStatsController）访问从一个控制器（MaterialOverviewController）加载的表。
我有一个RootLayoutController，我设法获取打印用途，但我似乎无法从OnFloorStatsController做同样的事情。）
以下是我的RootLayoutController中的代码：
@FXML
private void handlePrint() {
FXMLLoader fxmlLoader = new FXMLLoader();
fxmlLoader.setLocation(getClass().getResource("MaterialOverview.fxml"));
try {
AnchorPane frame = fxmlLoader.load();
} catch (IOException e) {
e.printStackTrace();
}
MaterialOverviewController c = fxmlLoader.getController();
//Loads data into table
c.setMainApp(mainApp);
PrinterJob printerJob = PrinterJob.createPrinterJob();
if (printerJob != null) {
boolean showDialog = printerJob.showPrintDialog(mainApp.getPrimaryStage().getOwner());
if (showDialog) {
c.getMaterialTable().setScaleX(0.72);
c.getMaterialTable().setScaleY(1.0);
c.getMaterialTable().setTranslateX(-94);
c.getMaterialTable().setTranslateY(-0);
boolean success = printerJob.printPage(c.getMaterialTable());
if (success) {
printerJob.endJob();
}
c.getMaterialTable().setTranslateX(0);
c.getMaterialTable().setTranslateY(0);
c.getMaterialTable().setScaleX(1.0);
c.getMaterialTable().setScaleY(1.0);
}
}
当我尝试使用时：
FXMLLoader fxmlLoader = new FXMLLoader();
fxmlLoader.setLocation(getClass().getResource("MaterialOverview.fxml"));
try {
AnchorPane frame = fxmlLoader.load();
} catch (IOException e) {
e.printStackTrace();
}
MaterialOverviewController c = fxmlLoader.getController();
//Loads data into table
c.setMainApp(mainApp);
进入我的OnFloorStatsController，我在c.setMainApp（mainApp）上得到一个空指针异常;
我觉得自己不能解决这个问题
编辑：
以下是我想要访问的控制器代码：
package sample;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.scene.control.*;
import java.util.Arrays;
import java.util.List;
public class MaterialOverviewController {
@FXML
private TableView<Material> materialTable;
@FXML
private TableColumn<Material, String> pONumberColumn;
@FXML
private TableColumn<Material, String> materialNameColumn;
@FXML
private TableColumn<Material, String> materialIdColumn;
@FXML
private TableColumn<Material, Double> materialWidthColumn;
@FXML
private TableColumn<Material, Integer> qtyOrderedColumn;
@FXML
private TableColumn<Material, Integer> qtyReceivedColumn;
@FXML
private TableColumn<Material, Integer> qtyBackOrderedColumn;
@FXML
private TableColumn<Material, Integer> qtyOnFloorColumn;
// @FXML
// private TableColumn<Material, DatePicker> dateOrderedColumn;
// @FXML
// private TableColumn<Material, DatePicker> estArrivalColumn;
@FXML
private TableColumn<Material, String> dateOrderedColumn;
@FXML
private TableColumn<Material, String> estArrivalColumn;
@FXML
private TableColumn<Material, String> supplierColumn;
@FXML
private TextField pONumberLabel;
@FXML
private TextField materialIdLabel;
@FXML
private TextField materialNameLabel;
@FXML
private TextField materialWidthLabel;
@FXML
private TextField qtyOrderedLabel;
@FXML
private TextField qtyRecievedLabel;
@FXML
private TextField qtyBackOrderedLabel;
@FXML
private TextField estArrivalLabel;
@FXML
private TextField qtyOnFloorLabel;
@FXML
private TextField supplierLabel;
@FXML
private TextField dateOrderedLabel;
@FXML
private TextField totalTextField;
@FXML
private TextField materialTextField;
private int materialTotal;
private String materialName;
private List<Material> materialId;
public TableView<Material> getMaterialTable() {
return materialTable;
}
// public void setMaterialTable(TableView<Material> materialTable) {
// this.materialTable = materialTable;
// }
private ObservableList<Integer> rollsTotal = FXCollections.observableArrayList();
private ObservableList<String> materialNames = FXCollections.observableArrayList();
// Reference to the main application.
private MainApp mainApp;
public MainApp getMainApp() {
return mainApp;
}
/**
* The constructor.
* The constructor is called before the initialize() method.
*/
public MaterialOverviewController() {
}
/**
* Initializes the controller class. This method is automatically called
* after the fxml file has been loaded.
*/
@FXML
private void initialize() {
materialTotal = 0;
// Initialize the material table with columns.
pONumberColumn.setCellValueFactory(cellData -> cellData.getValue().pONumberProperty());
materialNameColumn.setCellValueFactory(cellData -> cellData.getValue().materialNameProperty());
materialIdColumn.setCellValueFactory(cellData -> cellData.getValue().materialIdProperty());
materialWidthColumn.setCellValueFactory(cellData -> cellData.getValue().materialWidthProperty().asObject());
qtyOrderedColumn.setCellValueFactory(cellData -> cellData.getValue().qtyOrderedProperty().asObject());
qtyReceivedColumn.setCellValueFactory(cellData -> cellData.getValue().qtyReceivedProperty().asObject());
qtyBackOrderedColumn.setCellValueFactory(cellData -> cellData.getValue().qtyBackOrderedProperty().asObject());
// qtyBackOrderedColumn.setCellValueFactory(cellData -> cellData.getValue().qtyBackOrderedProperty().asObject());
qtyOnFloorColumn.setCellValueFactory(cellData -> cellData.getValue().qtyOnFloorProperty().asObject());
// dateOrderedColumn.setCellValueFactory(cellData -> cellData.getValue().dateOrderedProperty().asString());
dateOrderedColumn.setCellValueFactory(cellData -> cellData.getValue().dateOrderedProperty().asString());
estArrivalColumn.setCellValueFactory(cellData -> cellData.getValue().dateExpectedProperty().asString());
supplierColumn.setCellValueFactory(cellData -> cellData.getValue().supplierProperty());
// Clear material details.
showMaterialDetails(null);
// Listen for selection changes and show the material details when changed.
materialTable.getSelectionModel().selectedItemProperty().addListener(
(observable, oldValue, newValue) -> showMaterialDetails(newValue));
}
public void setMainApp(MainApp mainApp) {
this.mainApp = mainApp;
// Add observable list data to the table
materialTable.setItems(mainApp.getMaterialData());
}
private void showMaterialDetails(Material material) {
if (material != null) {
// Fill the labels with info from the material object.
pONumberLabel.setText(material.getPoNumber());
materialIdLabel.setText(material.getMaterialId());
materialNameLabel.setText(material.getMaterialName());
materialWidthLabel.setText(String.valueOf(material.getMaterialWidth()));
qtyOrderedLabel.setText(Integer.toString(material.getQtyOrdered()));
qtyRecievedLabel.setText(Integer.toString(material.getQtyReceived()));
qtyBackOrderedLabel.setText(Integer.toString(material.getQtyOrdered()-material.getQtyReceived()));
// qtyBackOrderedLabel.setText(Integer.toString(material.getQtyBackOrdered()));
qtyOnFloorLabel.setText(Integer.toString(material.getQtyOnFloor()));
// dateOrderedLabel.setText(DateUtil.format(material.getDateOrdered()));
// dateOrderedLabel.equals(DateUtil.format(material.getDateOrdered()));
// dateOrderedLabel.setText(DatePicker(String.valueOf(material.getDateOrdered());
// estArrivalLabel.setText(material.getSupplier());
supplierLabel.setText(material.getSupplier());
String pattern = "MM/dd/yyyy";
// dateTestTextField.setText(DateUtil.format(material.getBirthday()));
dateOrderedLabel.setText(DateUtil.format(material.getDateOrdered()));
estArrivalLabel.setText(DateUtil.format(material.getDateExpected()));
//TODO: set running material totals
// getMaterialNames(Arrays.asList(material));
handleSelectMaterial();
} else {
// Material is null, remove all the text.
pONumberLabel.setText("");
materialIdLabel.setText("");
materialNameLabel.setText("");
materialWidthLabel.setText("");
qtyOrderedLabel.setText("");
qtyRecievedLabel.setText("");
qtyBackOrderedLabel.setText("");
qtyOnFloorLabel.setText("");
dateOrderedLabel.setText("");
estArrivalLabel.setText("");
supplierLabel.setText("");
// dateOrderedLabel.setText("");
// dateOrderedLabel.setConverter();
// estArrivalLabel.setText("");
// dateOrderedLabel.setText("");
}
}
@FXML
private void handleDeleteMaterial() {
// int selectedIndex = materialTable.getSelectionModel().getSelectedIndex();
// materialTable.getItems().remove(selectedIndex);
int selectedIndex = materialTable.getSelectionModel().getSelectedIndex();
if (selectedIndex >= 0) {
materialTable.getItems().remove(selectedIndex);
} else {
// Nothing selected.
Alert alert = new Alert(Alert.AlertType.WARNING);
alert.initOwner(mainApp.getPrimaryStage());
alert.setTitle("No Selection");
alert.setHeaderText("No Material Selected");
alert.setContentText("Please select an order in the table.");
alert.showAndWait();
}
}
@FXML
private void handleNewMaterial() {
Material tempMaterial = new Material();
boolean okClicked = mainApp.showMaterialEditDialog(tempMaterial);
if (okClicked) {
mainApp.getMaterialData().add(tempMaterial);
}
}
@FXML
private void handleEditMaterial() {
Material selectedMaterial = materialTable.getSelectionModel().getSelectedItem();
if (selectedMaterial != null) {
boolean okClicked = mainApp.showMaterialEditDialog(selectedMaterial);
if (okClicked) {
showMaterialDetails(selectedMaterial);
}
} else {
// Nothing selected.
Alert alert = new Alert(Alert.AlertType.WARNING);
alert.initOwner(mainApp.getPrimaryStage());
alert.setTitle("No Selection");
alert.setHeaderText("No Material Selected");
alert.setContentText("Please select a material in the table.");
alert.showAndWait();
}
}
// public List<Material> getMaterialIds() {
// for (Material id : materialId)
// return Arrays.asList(id.getMaterialId());
// }
public void setMaterialTotal(List<Material> materials) {
// Count the number of people having their birthday in a specific month.
// int[] monthCounter = new int[12];
Material[] matId = new Material[20];
for (Material m : materials) {
Integer id = Integer.parseInt(m.getMaterialId());
// qty = m.getQtyBackOrdered();
// monthCounter[qty]++;
materialId.add(matId[id]);
}
for (Material id : materialId)
materialTextField.setText(String.valueOf(id)+"%n");
}
public Integer getTotals () {
return null;
}
public List getMaterialNames(List<Material> materials) {
for (Material name : materials) {
mainApp.getMaterialData();
if (!materialNames.contains(name)) {
materialNames.add(name.getMaterialName());
}
}
for (String name : materialNames) {
materialTextField.setText(name + "\n");
}
return Arrays.asList(materialNames);
}
@FXML
private void handleSelectMaterial() {
Material selectedMaterial = materialTable.getSelectionModel().getSelectedItem();
if (selectedMaterial != null) {
materialTotal = 0;
String stockId = selectedMaterial.getMaterialId();
materialName = selectedMaterial.getMaterialName();
Double width = selectedMaterial.getMaterialWidth();
materialTextField.setText(materialName + ", " + String.valueOf(width) + " inches");
for (Material id : mainApp.getMaterialData()) {
if (id.getMaterialWidth() == width && id.getMaterialId().equalsIgnoreCase(stockId)) {
materialTotal += id.getQtyOnFloor();
}
totalTextField.setText(String.valueOf(materialTotal));
}
}
}
}
以下是想要访问的控制器：
package sample;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Scene;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.control.TableView;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;
import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
public class OnFloorStatsController {
// @FXML
// private TableView<Material> materialTable;
@FXML
private BarChart<String, Integer> bc;
@FXML
private CategoryAxis xAxis = new CategoryAxis();
@FXML
private NumberAxis yAxis = new NumberAxis();
@FXML
private MaterialOverviewController getMvc;
private ObservableList<String> materialIds = FXCollections.observableArrayList();
private ObservableList<Material> materialz = FXCollections.observableArrayList();
private MainApp mainApp;
private MaterialOverviewController mMaterialOverviewController;
public TableView<Material> material;
public void setMainApp(MainApp mainApp) {
this.mainApp = mainApp;
}
// final static String austria = "14532";
// final static String brazil = "78333";
// final static String france = "40443";
// final static String italy = "72825";
// final static String usa = "72829";
public void getData() {
FXMLLoader fxmlLoader = new FXMLLoader();
fxmlLoader.setLocation(getClass().getResource("MaterialOverview.fxml"));
try {
AnchorPane frame = fxmlLoader.load();
} catch (IOException e) {
e.printStackTrace();
}
MaterialOverviewController c = fxmlLoader.getController();
//Loads data into table
c.setMainApp(mainApp);
}
public void start(Stage stage) {
getData();
stage.setTitle("Material On Floor");
final CategoryAxis xAxis = new CategoryAxis();
final NumberAxis yAxis = new NumberAxis();
final BarChart<String, Number> bc =
new BarChart<String, Number>(xAxis, yAxis);
bc.setTitle("Material On Floor");
xAxis.setLabel("Material");
yAxis.setLabel("Quantity");
XYChart.Series series1 = new XYChart.Series();
series1.setName("6 inch");
Integer floorTotal = 0;
for (Material id :mainApp.getMaterialData()) {
if (id.getMaterialWidth() < 6.9) {
floorTotal = id.getQtyOnFloor();
for (Material size : mainApp.getMaterialData()) {
if ( id.getMaterialId().equalsIgnoreCase(size.getMaterialId()) &&
size.getMaterialWidth() == id.getMaterialWidth()) {
floorTotal += size.getQtyOnFloor();
}
else {
floorTotal = id.getQtyOnFloor();
}
// for (Material id : mainApp.getMaterialData()) {
// if (id.getMaterialWidth() < 7) {
}
}
// else {
// series1.getData().add(new XYChart.Data(id.getMaterialId(), 0));
// }
series1.getData().add(new XYChart.Data(id.getMaterialId(), floorTotal));
}
// series1.getData().add(new XYChart.Data(austria, 10));
// series1.getData().add(new XYChart.Data(brazil, 1));
// series1.getData().add(new XYChart.Data(france, 10));
// series1.getData().add(new XYChart.Data(italy, 7));
// series1.getData().add(new XYChart.Data(usa, 3));
// XYChart.Series series2 = new XYChart.Series();
// series2.setName("8 inch");
//// for (Material id : mainApp.getMaterialData()) {
// for (Material id : materialz) {
//// if (id.getMaterialWidth() > 6.9 ) {
// series2.getData().add(new XYChart.Data(id.getMaterialId(), id.getQtyOnFloor()));
//// }
//// else {
//// series2.getData().add(new XYChart.Data(id.getMaterialId(), 0));
//// }
// }
// series2.getData().add(new XYChart.Data(austria, 3));
// series2.getData().add(new XYChart.Data(brazil, 7));
// series2.getData().add(new XYChart.Data(france, 7));
// series2.getData().add(new XYChart.Data(italy, 10));
// series2.getData().add(new XYChart.Data(usa, 5));
// XYChart.Series series3 = new XYChart.Series();
// series3.setName("Other");
// for (Material id : materialz) {
// if (id.getMaterialWidth() < 5.9 || id.getMaterialWidth() > 9.1) {
// series3.getData().add(new XYChart.Data(id.getMaterialId(), id.getQtyOnFloor()));
Scene scene = new Scene(bc, 800, 600);
bc.getData().addAll(series1/*, series2, series3*/);
stage.setScene(scene);
stage.show();
}
}
这是调用OnFloorStatsController的控制器：
package sample;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.Event;
import javafx.event.EventDispatchChain;
import javafx.event.EventDispatcher;
import javafx.fxml.FXMLLoader;
import javafx.print.*;
import javafx.scene.Node;
import javafx.scene.image.ImageView;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.AnchorPane;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.scene.transform.Scale;
import javafx.stage.Stage;
import sample.MaterialOverviewController;
import java.io.File;
import java.io.IOException;
import java.util.Optional;
import com.sun.java.swing.action.CancelAction;
import javafx.fxml.FXML;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.ButtonBar;
import javafx.scene.control.ButtonType;
import javafx.stage.FileChooser;
import javafx.scene.control.TableView;
/**
*
* The controller for the root layout. The root layout provides the basic
* application layout containing a menu bar and space where other JavaFX
* elements can be placed.
*
*/
public class RootLayoutController {
// Reference to the main application
private MainApp mainApp;
private MaterialOverviewController mMaterialOverviewController;
public TableView<Material> material;
public void setMainApp(MainApp mainApp) {
this.mainApp = mainApp;
}
/**
* Creates an empty material inventory.
*/
@FXML
private void handleNew() {
mainApp.getMaterialData().clear();
mainApp.setMaterialFilePath(null);
}
/**
* Opens a FileChooser to let the user select an address book to load.
*/
@FXML
private void handleOpen() {
FileChooser fileChooser = new FileChooser();
// Set extension filter
FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter(
"XML files (*.xml)", "*.xml");
fileChooser.getExtensionFilters().add(extFilter);
// Show save file dialog
File file = fileChooser.showOpenDialog(mainApp.getPrimaryStage());
if (file != null) {
mainApp.loadMaterialDataFromFile(file);
}
}
/**
* Saves the file to the person file that is currently open. If there is no
* open file, the "save as" dialog is shown.
*/
@FXML
private void handleSave() {
File materialFile = mainApp.getMaterialFilePath();
if (materialFile != null) {
mainApp.saveMaterialDataToFile(materialFile);
Alert alert = new Alert(AlertType.INFORMATION);
alert.setHeaderText("File Saved");
alert.showAndWait();
} else {
handleSaveAs();
}
}
/**
* Opens a FileChooser to let the user select a file to save to.
*/
@FXML
private void handleSaveAs() {
FileChooser fileChooser = new FileChooser();
// Set extension filter
FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter(
"XML files (*.xml)", "*.xml");
fileChooser.getExtensionFilters().add(extFilter);
// Show save file dialog
File file = fileChooser.showSaveDialog(mainApp.getPrimaryStage());
if (file != null) {
// Make sure it has the correct extension
if (!file.getPath().endsWith(".xml")) {
file = new File(file.getPath() + ".xml");
}
mainApp.saveMaterialDataToFile(file);
}
}
/**
* Opens an about dialog.
*/
@FXML
private void handleAbout() {
Alert alert = new Alert(AlertType.INFORMATION);
alert.setTitle("Material Inventory");
alert.setHeaderText("About");
alert.setContentText("Version 1.2\n\nCreator: Mike Brisson\n\nMark can't say I've never given him anything :)");
alert.showAndWait();
}
@FXML
private void handleEdit() {
Alert alert = new Alert(AlertType.WARNING);
alert.setTitle("Why would you click that?");
alert.setHeaderText("You can't follow instructions very well");
alert.setContentText("Was it worth it?");
alert.showAndWait();
}
@FXML
private void handlePrint() {
FXMLLoader fxmlLoader = new FXMLLoader();
fxmlLoader.setLocation(getClass().getResource("MaterialOverview.fxml"));
try {
AnchorPane frame = fxmlLoader.load();
} catch (IOException e) {
e.printStackTrace();
}
MaterialOverviewController c = fxmlLoader.getController();
//Loads data into table
c.setMainApp(mainApp);
PrinterJob printerJob = PrinterJob.createPrinterJob();
// if(printerJob.showPrintDialog(mainApp.getPrimaryStage().getOwner()) && printerJob.printPage(c.getMaterialTable()))
// printerJob.endJob();
if (printerJob != null) {
boolean showDialog = printerJob.showPrintDialog(mainApp.getPrimaryStage().getOwner());
// boolean showDialog = printerJob.showPageSetupDialog(mainApp.getPrimaryStage().getOwner());
if (showDialog) {
c.getMaterialTable().setScaleX(0.72);
c.getMaterialTable().setScaleY(1.0);
c.getMaterialTable().setTranslateX(-94);
c.getMaterialTable().setTranslateY(-0);
boolean success = printerJob.printPage(c.getMaterialTable());
if (success) {
printerJob.endJob();
showDialog=false;
}
c.getMaterialTable().setTranslateX(0);
c.getMaterialTable().setTranslateY(0);
c.getMaterialTable().setScaleX(1.0);
c.getMaterialTable().setScaleY(1.0);
}
showDialog=false;
}
}
@FXML
private void handleShowMaterialStatistics() {
mainApp.showMaterialStatistics();
}
@FXML
private void handleShowOnFloorStats() {
mainApp.showOnFloorStatistics();
}
@FXML
private void handleShowBarChartTest() {
mainApp.showBarChartTest();
}
/**
* Closes the application.
*/
@FXML
private void handleExit() {
Alert alert = new Alert(AlertType.CONFIRMATION);
alert.setTitle("Exit Confirmation");
alert.setHeaderText("Are you sure you want to exit without Saving?");
alert.setContentText("Choose your option.");
ButtonType buttonSave = new ButtonType("Save");
ButtonType buttonCancel = new ButtonType("Cancel", ButtonBar.ButtonData.CANCEL_CLOSE);
ButtonType buttonExit = new ButtonType("Exit");
alert.getButtonTypes().setAll(buttonSave, buttonCancel, buttonExit);
Optional<ButtonType> result = alert.showAndWait();
if (result.get() == buttonSave){
handleSaveAs();
} else if (result.get() == buttonExit) {
System.exit(0);
} else if (result.get() == buttonCancel){
alert.close();
}
}
}