课程要求我们创建一个图表，该图表显示来自JavaFX中服务器的RESTFUL数据。我所拥有的文件是我们从导师那里收到的，他从未真正解释过他是如何取得最终结果的。所以我只是想知道在这个Java Fxml项目中，我是如何编写控制器以添加动态按钮的？
已经调用的按钮是复选框，当它们被选中时，它们会显示条形图中待售的汽车。我想添加按钮，让我选择销售年份，并添加功能到硬编码按钮，从条形图切换到折线图。
FXML代码
<AnchorPane id="" fx:id="AnchorPane1" prefHeight="-1.0" prefWidth="-1.0" xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="salescwck3.SalesController">
<children>
<VBox spacing="10.0">
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
<children>
<HBox fx:id="HBox1" spacing="10.0">
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
</HBox>
<HBox fx:id="HBox11" spacing="10.0">
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
</HBox>
<HBox alignment="TOP_RIGHT" prefHeight="19.0" prefWidth="217.0" spacing="10.0">
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
<children>
<RadioButton fx:id="RadioButton1" mnemonicParsing="false" text="Bar Chart" />
<RadioButton fx:id="RadioButton2" mnemonicParsing="false" text="Line Graph" />
</children>
</HBox>
<BarChart fx:id="BarChart1" animated="false" title="Vehicle Sales">
<xAxis>
<CategoryAxis label="Region" side="BOTTOM" fx:id="xAxis" />
</xAxis>
<yAxis>
<NumberAxis fx:id="yAxis" label="Quantity of Sales" side="LEFT" />
</yAxis>
</BarChart>
</children>
</VBox>
</children>
</AnchorPane>
主要Java
package salescwck3;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class SalesCwck3 extends Application {
@Override
public void start(Stage primaryStage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("SalesController.fxml"));
Scene scene = new Scene(root);
scene.getStylesheets().add(SalesCwck3.class.getResource("Style.css").toExternalForm());
primaryStage.setScene(scene);
primaryStage.setTitle("SalesCwck3");
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
FXML控制器
public class SalesController implements Initializable {
private static String markup;
private static List<Sales> sales;
private static List<String> vehicles;
private static List<Integer> year;
private DashService service;
private CheckBox[] checkBoxes;
private ChoiceBox[] choiceBoxes;
@FXML
private RadioButton RadioButton1, RadioButton2;
//Need to learn how to switch from bar chart to line graph
@FXML
private AnchorPane AnchorPane1;
@FXML
private HBox HBox1;
//Contains The Check Boxes constructed for vehicles
@FXML
private HBox HBox2;
//Populate this with the year Choice Box
@FXML
private NumberAxis yAxis;
@FXML
private CategoryAxis xAxis;
@FXML
private BarChart<?, ?> BarChart1;
@Override
public void initialize(URL url, ResourceBundle rb) {
service = new DashService();
service.setAddress("http://glynserver.cms.livjm.ac.uk/DashService/SalesGetSales");
service.setOnSucceeded(new EventHandler<WorkerStateEvent>() {
@Override
public void handle(WorkerStateEvent e) {
markup = e.getSource().getValue().toString();
sales = (new Gson()).fromJson(markup, new TypeToken<LinkedList<Sales>>() {}.getType());
vehicles = sales.stream().map(o -> o.getVehicle()).distinct().collect(Collectors.toList());
year = sales.stream().map(o -> o.getYear()).distinct().collect(Collectors.toList());
// ToDo : Debugging !
System.out.println(markup);
for (Sales sale : sales) {
System.out.println(sale.toString());
}
constructCheckBoxes();
}
});
service.start();
}
//Need a Progress Loader.
private void constructCheckBoxes() {
checkBoxes = new CheckBox[vehicles.size()];
for (byte index = 0; index < vehicles.size(); index++) {
checkBoxes[index] = new CheckBox(vehicles.get(index));
checkBoxes[index].setSelected(true);
checkBoxes[index].setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent e) {
constructSeries();
}
});
HBox1.getChildren().add(checkBoxes[index]);
}
// NOTE : More Controls Visible !
AnchorPane1.getScene().getWindow().sizeToScene();
constructSeries();
}
private void constructSeries() {
BarChart1.getData().clear();
for (CheckBox checkBox : checkBoxes) {
if (checkBox.isSelected()) {
XYChart.Series series = new XYChart.Series();
series.setName(checkBox.getText());
// NOTE : Java SE 7 Code !
for (Sales sale : sales) {
if (sale.getVehicle().equals(checkBox.getText())) {
series.getData().add(new XYChart.Data<>( sale.getRegion(), sale.getQuantity()));
}
}
BarChart1.getData().add(series);
}
}
}
/*
private void constructChoiceBoxes(){}
//Trying to create another choice box in order to choose which date of sales are shown on the graph.
//Need to know where to put the "constructChoiceBox()" and "constructChoiceSeries()" Code for year Choice Boxes.
private void constructChoiceSeries(){}
*/
private static class DashService extends Service<String> {
private StringProperty address = new SimpleStringProperty();
public final void setAddress(String address) {
this.address.set(address);
}
public final String getAddress() {
return address.get();
}
public final StringProperty addressProperty() {
return address;
}
@Override
protected Task<String> createTask() {
return new Task<String>() {
private URL url;
private HttpURLConnection connect;
private String markup = "";
@Override
protected String call() {
try {
url = new URL(getAddress());
connect = (HttpURLConnection)url.openConnection();
connect.setRequestMethod("GET");
connect.setRequestProperty("Accept", "application/json");
connect.setRequestProperty("Content-Type", "application/json");
markup = (new BufferedReader(new InputStreamReader(connect.getInputStream()))).readLine();
}
catch (Exception e) {
e.printStackTrace();
}
finally {
if (connect != null) {
connect.disconnect();
}
}
return markup;
}
};
}
}
}
Gson Java
public class Sales {
final private int Year, QTR, Quantity;
final private String Region, Vehicle;
public Sales(Integer Year, String Region, Integer QTR, String Vehicle, Integer Quantity) {
this.Year = Year;
this.Region = Region;
this.QTR = QTR;
this.Vehicle = Vehicle;
this.Quantity = Quantity;
}
@Override
public String toString() {
return String.format("%s%s%s%s%s", ("Year:" + Year + " "), ("Region:" + Region + " "), ("QTR:" + QTR + " "),("Vehicle:" + Vehicle + " "), ("Quantity:" + Quantity + " "));
}
public Integer getYear() {
return Year;
}
public String getRegion() {
return Region;
}
public Integer getQTR() {
return QTR;
}
public String getVehicle() {
return Vehicle;
}
public Integer getQuantity() {
return Quantity;
}
}