我看到了很多与我的问题有关的帖子，但似乎没有什么对我有效。我正在用JavaFX和FXML编写简单的窗口应用程序。我有一个Main类，它有带日期名称的字段。我还有两个控制器类——controller（它就像更重要的控制器一样）和ShowDays。每个控制器都有自己的FXML，它们负责切换场景和与用户（以及Model=Main）合作。在Controller类中，用户可以将新的一天添加到我们的日期名称中，也可以删除最后一天。在ShowDays类中，用户可以在窗口上打印日期名称。这一切都与点击按钮有关。
我知道我可以更轻松地组织我的程序，我可以在控制器类中打印天数名称并删除所有 ShowDays 类，但这只是我想要创建的项目的一部分，我只是想了解真正的程序员会如何做这种事情。
这是我的代码：
public class Main extends Application {
private ArrayList<String> daysNames;
public Main() {
daysNames = new ArrayList<>();
}
public void addDay() {
String[] days = {"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"};
System.out.println("I'm adding day!" + daysNames.size());
if (getDaysNames().size() < 7)
getDaysNames().add(days[getDaysNames().size()]);
else
System.out.println("Can't add more days!");
}
public void removeDay() {
if (!getDaysNames().isEmpty())
getDaysNames().remove(getDaysNames().get(getDaysNames().size()-1));
}
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
}
//setters,getters...
}
控制器类别:
public class Controller implements Initializable {
private Main myMain;
@FXML
private ShowDays showDays;
public Controller() {
myMain=new Main();
showDays = new ShowDays(myMain);
}
public Controller(Main main) {
this.myMain = main;
showDays = new ShowDays(myMain);
}
@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
}
public void addDay() {
myMain.addDay();
}
public void removeDay() {
myMain.removeDay();
}
public void GOTOshowDays(ActionEvent event) throws IOException {
Parent showDaysParent = FXMLLoader.load(getClass().getResource("ShowDays.fxml"));
Scene showDaysScene = new Scene(showDaysParent);
Stage window = (Stage) ((Node)event.getSource()).getScene().getWindow();
window.setScene(showDaysScene);
window.show();
}
}
表演日类：
public class ShowDays implements Initializable {
@FXML
private Text text;
private Main myMain;
public ShowDays() {
myMain = new Main();
}
public ShowDays(Main main) {
myMain = main;
}
@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
}
public void BackToController(ActionEvent event) throws IOException {
Parent controllerParent = FXMLLoader.load(getClass().getResource("sample.fxml"));
Scene controllerScene = new Scene(controllerParent);
Stage window = (Stage) ((Node)event.getSource()).getScene().getWindow();
window.setScene(controllerScene);
window.show();
}
public void showDaysInWindow(ActionEvent event) throws IOException {
String allText = "";
for (String day : myMain.getDaysNames())
allText += day + " ";
text.setText(allText);
}
}
和FXML文件:sample.fxml
<HBox prefHeight="100.0" prefWidth="483.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0">
<children>
<Button layoutX="-8.0" layoutY="48.0" mnemonicParsing="false" onAction="#GOTOshowDays" text="GOTO show days" />
</children>
</AnchorPane>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0" />
<Button mnemonicParsing="false" onAction="#addDay" text="add day" />
<Button mnemonicParsing="false" onAction="#removeDay" text="remove day" />
显示日期.fxml
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.ShowDays">
<center>
<Text fx:id="text" strokeType="OUTSIDE" strokeWidth="0.0" BorderPane.alignment="CENTER" />
</center>
<top>
<Button mnemonicParsing="false" onAction="#showDaysInWindow" text="Show days" BorderPane.alignment="CENTER" />
</top>
<bottom>
<Button mnemonicParsing="false" onAction="#BackToController" text="Go back" BorderPane.alignment="CENTER" />
</bottom>
</BorderPane>
我不确定ShowDay用户操作是否按预期工作（都是关于这个的…），但控制器可以。问题是，当我在控制器场景中添加几天，然后将场景切换到显示场景时，我似乎丢失了我的主实例…当我有一个控制器类时，我的代码处理所有时间在同一个Main实例上工作，添加/删除天数按预期工作，但我无法处理连接多个控制器来建模和相互连接…我花了这么多时间试图解决这个问题，我真的不明白我在互联网上找到的所有提示，所以我问你。
你应该在这里使用@James_D的创意回答。您的问题是如何将模型从一个控制器传递到下一个控制器。在本例中，模型是一个＜code＞列表
主要的
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.stage.Stage;
/**
*
* @author blj0011
*/
public class JavaFXApplication320 extends Application
{
@Override
public void start(Stage stage)
{
try {
String[] days = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};
List<String> daysNames = new ArrayList();
for (int i = 0; i < days.length; i++) {
daysNames.add(days[i]);
}
//Load the FXML. Pass the model to initModel
FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
loader.load();
FXMLDocumentController fXMLDocumentController = loader.getController();
fXMLDocumentController.initModel(daysNames);
Scene scene = new Scene(loader.getRoot());
stage.setScene(scene);
stage.show();
}
catch (IOException ex) {
ex.printStackTrace();
}
}
/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
launch(args);
}
}
FXML文档控制器
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;
/**
*
* @author blj0011
*/
public class FXMLDocumentController implements Initializable
{
List<String> model;
@FXML
private void goToShowDays(ActionEvent event)
{
try {
FXMLLoader showDaysLoader = new FXMLLoader(getClass().getResource("ShowDays.fxml"));
showDaysLoader.load();
ShowDaysController showDaysController = showDaysLoader.getController();
showDaysController.initModel(this.model);
Stage stage = (Stage) ((Button) event.getSource()).getScene().getWindow();
stage.setScene(new Scene(showDaysLoader.getRoot()));
}
catch (IOException ex) {
ex.printStackTrace();
}
}
@FXML
private void addDay(ActionEvent event)
{
String[] days = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};
List<String> tempDays = new ArrayList(Arrays.asList(days));
if (!this.model.containsAll(tempDays)) {
tempDays.removeAll(this.model);
if (tempDays.size() > 0) {
this.model.add(tempDays.get(0));
}
}
}
@FXML
private void removeDay(ActionEvent event)
{
if (this.model.size() > 0) {
Random random = new Random();
this.model.remove(random.nextInt(this.model.size()));
}
}
@Override
public void initialize(URL url, ResourceBundle rb)
{
// TODO
}
public void initModel(List<String> model)
{
// ensure model is only set once:
if (this.model != null) {
throw new IllegalStateException("Model can only be initialized once");
}
this.model = model;
this.model.forEach(System.out::println);
}
}
FXMLDocument
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<HBox prefHeight="100.0" prefWidth="483.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="javafxapplication320.FXMLDocumentController">
<children>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0">
<children>
<Button layoutX="-8.0" layoutY="48.0" mnemonicParsing="false" onAction="#goToShowDays" text="GOTO show days" />
</children>
</AnchorPane>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0" />
<Button mnemonicParsing="false" onAction="#addDay" text="add day" />
<Button mnemonicParsing="false" onAction="#removeDay" text="remove day" />
</children>
</HBox>
ShowDays控制器
import java.io.IOException;
import java.net.URL;
import java.util.List;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.text.Text;
import javafx.stage.Stage;
/**
* FXML Controller class
*
* @author blj0011
*/
public class ShowDaysController implements Initializable
{
@FXML
Text text;
List<String> model;
@FXML
private void showDaysInWindow(ActionEvent event)
{
text.setText(String.join(" ", this.model));
}
@FXML
private void backToController(ActionEvent event)
{
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
loader.load();
FXMLDocumentController fXMLDocumentController = loader.getController();
fXMLDocumentController.initModel(this.model);
Stage stage = (Stage) ((Button) event.getSource()).getScene().getWindow();
stage.setScene(new Scene(loader.getRoot()));
}
catch (IOException ex) {
ex.printStackTrace();
}
}
/**
* Initializes the controller class.
*
* @param url
* @param rb
*/
@Override
public void initialize(URL url, ResourceBundle rb)
{
// TODO
}
public void initModel(List<String> model)
{
// ensure model is only set once:
if (this.model != null) {
throw new IllegalStateException("Model can only be initialized once");
}
this.model = model;
this.model.forEach(System.out::println);
}
}
显示FXML
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.text.*?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="javafxapplication320.ShowDaysController">
<center>
<Text fx:id="text" strokeType="OUTSIDE" strokeWidth="0.0" BorderPane.alignment="CENTER" />
</center>
<top>
<Button mnemonicParsing="false" onAction="#showDaysInWindow" text="Show days" BorderPane.alignment="CENTER" />
</top>
<bottom>
<Button mnemonicParsing="false" onAction="#backToController" text="Go back" BorderPane.alignment="CENTER" />
</bottom>
</BorderPane>
