JavaFx在Main中获取Controller初始化相关配置和Fxml

Main中的方法

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

import java.net.URL;
import javafx.fxml.JavaFXBuilderFactory;

public class Main extends Application {
  
    @Override
    public void start(Stage primaryStage) throws Exception {
        URL location = getClass().getResource("sample.fxml");
        FXMLLoader fxmlLoader = new FXMLLoader();
        fxmlLoader.setLocation(location);
        fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
        Parent root = fxmlLoader.load();
        //如果使用 Parent root = FXMLLoader.load(...) 静态读取方法，无法获取到Controller的实例对象
        primaryStage.setTitle("Hello World");
        Scene scene = new Scene(root, 400, 500);
        //加载css样式
        //scene.getStylesheets().add(getClass().getResource("style1.css").toExternalForm());
        primaryStage.setScene(scene);
        Controller controller = fxmlLoader.getController();   //获取Controller的实例对象
        //Controller中写的初始化方法
        controller.Init();
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

Controller类：

package sample;

import javafx.collections.FXCollections;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ComboBox;
import javafx.event.ActionEvent;
import javafx.collections.ObservableList;

public class Controller {

    @FXML
    private Button mButton;
    @FXML
    private Label mLabel;
    @FXML
    private ComboBox comboBox_API;

    Integer ClickCount=0;


    private ObservableList<String> apiList=FXCollections.observableArrayList();
    public void Init(){
        apiList.add("创建订单");
        apiList.add("获取订单信息");
        this.comboBox_API.setItems(apiList);
        this.mButton.setText("按钮1");
    }

    @FXML
    public void onButtonClick(ActionEvent event) {
        ClickCount++;
        mLabel.setText("HelloWorld"+ClickCount);
    }
}

Fxml文件：

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.collections.ObservableList?>

<GridPane alignment="center" hgap="10" prefHeight="400.0" prefWidth="500.0" vgap="10" xmlns="http://javafx.com/javafx/8.0.121" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <columnConstraints>
       <ColumnConstraints prefWidth="60"/>
       <ColumnConstraints prefWidth="60" />
       <ColumnConstraints prefWidth="280"/>
   </columnConstraints>
   <rowConstraints>
       <RowConstraints prefHeight="40"/>
       <RowConstraints prefHeight="200" />
       <RowConstraints prefHeight="40" />
       <RowConstraints prefHeight="200" />
   </rowConstraints>
   <children>
       <Label layoutX="10" layoutY="10" text="API接口" GridPane.columnIndex="0" GridPane.rowIndex="0">
         <GridPane.margin>
            <Insets bottom="10.0" top="5.0" />
         </GridPane.margin>
       </Label>
       <ComboBox fx:id="comboBox_API" prefWidth="120" GridPane.columnIndex="1" GridPane.rowIndex="0">
         <GridPane.margin>
            <Insets bottom="10.0" top="5.0" />
         </GridPane.margin>
       </ComboBox>
      <Button fx:id="mButton" mnemonicParsing="false" onAction="#onButtonClick" text="Button" GridPane.columnIndex="2" GridPane.rowIndex="1" />
      <Label fx:id="mLabel" text="Label" GridPane.columnIndex="2" GridPane.rowIndex="2" />
   </children>
</GridPane>