我有两个课程PersonOverviewController和RootLayoutController
我正在尝试从RootLayoutController导入csv文件，并通过TableView的方法PersonOverViewController在onLoad()中创建的RootLayoutController中显示该文件。但是给了我一个例外......
package example.address.view;
import example.address.MainApp;
import example.address.model.Person;
import example.address.util.DateUtil;
import javafx.fxml.FXML;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
public class PersonOverviewController {
@FXML
public TableView<Person> personTable;
@FXML
public TableColumn<Person, String> firstNameColumn;
@FXML
public TableColumn<Person, String> lastNameColumn;
@FXML
public Label firstNameLabel;
@FXML
public Label lastNameLabel;
@FXML
private Label streetLabel;
@FXML
private Label postalCodeLabel;
@FXML
private Label cityLabel;
@FXML
private Label birthdayLabel;
@FXML
private Button btnLoad = new Button("Load");
// Reference to the main application.
private MainApp mainApp;
/**
* The constructor.
* The constructor is called before the initialize() method.
*/
public PersonOverviewController() {
}
/**
* Fills all text fields to show details about the person.
* If the specified person is null, all text fields are cleared.
*
* @param person the person or null
*/
private void showPersonDetails(Person person) {
if (person != null) {
// Fill the labels with info from the person object.
firstNameLabel.setText(person.getFirstName());
lastNameLabel.setText(person.getLastName());
streetLabel.setText(person.getStreet());
postalCodeLabel.setText(Integer.toString(person.getPostalCode()));
cityLabel.setText(person.getCity());
// TODO: We need a way to convert the birthday into a String!
birthdayLabel.setText(DateUtil.format(person.getBirthday()));
// birthdayLabel.setText(...);
} else {
// Person is null, remove all the text.
firstNameLabel.setText("");
lastNameLabel.setText("");
streetLabel.setText("");
postalCodeLabel.setText("");
cityLabel.setText("");
birthdayLabel.setText("");
}
}
/**
* Initializes the controller class. This method is automatically called
* after the fxml file has been loaded.
*/
@FXML
private void initialize() {
// Initialize the person table with the two columns.
firstNameColumn.setCellValueFactory(
cellData -> cellData.getValue().firstNameProperty());
lastNameColumn.setCellValueFactory(
cellData -> cellData.getValue().lastNameProperty());
// Clear person details.
showPersonDetails(null);
// Listen for selection changes and show the person details when changed.
personTable.getSelectionModel().selectedItemProperty().addListener(
(observable, oldValue, newValue) -> showPersonDetails(newValue));
}
/**
* Is called by the main application to give a reference back to itself.
*
* @param mainApp
*/
public void setMainApp(MainApp mainApp) {
this.mainApp = mainApp;
// Add observable list data to the table
personTable.setItems(mainApp.getPersonData());
}
/**
* Called when the user clicks on the delete button.
*/
@FXML
private void handleDeletePerson() {
int selectedIndex = personTable.getSelectionModel().getSelectedIndex();
if (selectedIndex >= 0) {
personTable.getItems().remove(selectedIndex);
} else {
// Nothing selected.
Alert alert = new Alert(AlertType.WARNING);
alert.initOwner(mainApp.getPrimaryStage());
alert.setTitle("No Selection");
alert.setHeaderText("No Person Selected");
alert.setContentText("Please select a person in the table.");
alert.showAndWait();
}
}
/**
* Called when the user clicks the new button. Opens a dialog to edit
* details for a new person.
*/
@FXML
private void handleNewPerson() {
Person tempPerson = new Person();
boolean okClicked = mainApp.showPersonEditDialog(tempPerson);
if (okClicked) {
mainApp.getPersonData().add(tempPerson);
}
}
/**
* Called when the user clicks the edit button. Opens a dialog to edit
* details for the selected person.
*/
@FXML
private void handleEditPerson() {
Person selectedPerson = personTable.getSelectionModel().getSelectedItem();
if (selectedPerson != null) {
boolean okClicked = mainApp.showPersonEditDialog(selectedPerson);
if (okClicked) {
showPersonDetails(selectedPerson);
}
} else {
// Nothing selected.
Alert alert = new Alert(AlertType.WARNING);
alert.initOwner(mainApp.getPrimaryStage());
alert.setTitle("No Selection");
alert.setHeaderText("No Person Selected");
alert.setContentText("Please select a person in the table.");
alert.showAndWait();
}
}
}
和
package example.address.view;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.ListIterator;
import java.util.Scanner;
import example.address.MainApp;
import example.address.model.Person;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.stage.FileChooser;
/**
* 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.
*
* @author Marco Jakob
*/
public class RootLayoutController {
// Reference to the main application
private MainApp mainApp;
public ArrayList<Contacts> list;
private ListIterator<Contacts> LIT;
FileChooser fc = new FileChooser();
public ObservableList<Person> data;
PersonOverviewController overView = new PersonOverviewController();
/**
* Is called by the main application to give a reference back to itself.
*
* @param mainApp
*/
public void setMainApp(MainApp mainApp) {
this.mainApp = mainApp;
}
/**
* Creates an empty address book.
*/
@FXML
private void handleNew() {
mainApp.getPersonData().clear();
mainApp.setPersonFilePath(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.loadPersonDataFromFile(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 personFile = mainApp.getPersonFilePath();
if (personFile != null) {
mainApp.savePersonDataToFile(personFile);
} 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.savePersonDataToFile(file);
}
}
/**
* Opens an about dialog.
*/
@FXML
private void handleAbout() {
Alert alert = new Alert(AlertType.INFORMATION);
alert.setTitle("AddressApp");
alert.setHeaderText("About");
alert.setContentText("STY");
alert.showAndWait();
}
/**
* Opens the birthday statistics.
*/
@FXML
private void handleShowBirthdayStatistics() {
mainApp.showBirthdayStatistics();
}
/**
* Closes the application.
*/
@FXML
private void handleExit() {
System.exit(0);
}
@FXML//Load CSV Data
public void onLoad()throws IOException {
data = FXCollections.observableArrayList();//Hold data for the table
File fileInfo = new File("C:/A_CSV/People.csv");
if(fileInfo.length()==0) {
Alert alert = new Alert(Alert.AlertType.WARNING);
alert.setTitle("Information");
alert.setHeaderText("");
alert.setContentText("No Data in File at "+ fileInfo+"\n"+
"Enter Data and Save");
alert.showAndWait();
return;
}
fc.setTitle("Load Contacts Info");
fc.setInitialDirectory(new File("C:/"));
fc.setInitialDirectory(new File("C:/A_CSV"));
fc.setInitialFileName("People.csv");
File file = fc.showOpenDialog(null);
if (file == null) {
return;
}
String correctFile = file.getName();
if(!(correctFile.matches("People.csv"))){
Alert alert = new Alert(Alert.AlertType.ERROR);
alert.setTitle("Information");
alert.setHeaderText("");
alert.setContentText("The File at " + file + "\n\n"+
"is NOT accociated with this application\n\n"+
"Select the File at "+fileInfo);
alert.showAndWait();
return;
}
Path dirP = Paths.get(String.valueOf(file));
InputStream in = Files.newInputStream(dirP);
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
list = new ArrayList<Contacts>();
Scanner scan = new Scanner(reader);
scan.useDelimiter(",");
// scan.useDelimiter("\\s*,\\s*");
while (scan.hasNext()){
String fname = scan.next();
String lname = scan.nextLine();
lname = lname.replaceAll(",", "");
overView.firstNameLabel.setText(String.valueOf(fname));
overView.lastNameLabel.setText(String.valueOf(lname));
list.add(new Contacts(fname,lname));
data.add(new Person(fname,lname));
overView.personTable.setItems(data);
overView.firstNameColumn.setCellValueFactory(cellData -> cellData.getValue().firstNameProperty());
overView.lastNameColumn.setCellValueFactory(cellData -> cellData.getValue().lastNameProperty());
}
scan.close();
LIT = list.listIterator();
if (LIT.hasNext()){
Contacts p = LIT.next();
getContacts(p);
}
}
public void getContacts(Contacts p){
overView.firstNameLabel.setText("" + p.getFName());
overView.lastNameLabel.setText("" + p.getLName());
}
}
它给了我错误
Feb 15, 2016 1:28:39 PM javafx.fxml.FXMLLoader$ValueElement processValue
WARNING: Loading FXML document with JavaFX API of version 8.0.65 by JavaFX runtime of version 8.0.45
Feb 15, 2016 1:28:43 PM javafx.fxml.FXMLLoader$ValueElement processValue
WARNING: Loading FXML document with JavaFX API of version 8.0.65 by JavaFX runtime of version 8.0.45
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.event.Event.fireEvent(Unknown Source)
at javafx.scene.control.MenuItem.fire(Unknown Source)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.doSelect(Unknown Source)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.lambda$createChildren$341(Unknown Source)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer$$Lambda$343/4980353.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.event.Event.fireEvent(Unknown Source)
at javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.scene.Scene$MouseHandler.access$1500(Unknown Source)
at javafx.scene.Scene.impl_processMouseEvent(Unknown Source)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$350(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$326/15265021.get(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.notifyMouse(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$145(Unknown Source)
at com.sun.glass.ui.win.WinApplication$$Lambda$36/3326003.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
... 47 more
Caused by: java.lang.NullPointerException
at example.address.view.RootLayoutController.onLoad(RootLayoutController.java:198)
... 56 more
我该怎么办？