问修改按钮上的Excel单元格的值单击Apache POI & JavaFX

EN

package javafxapplication2;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import org.apache.poi.xssf.usermodel.*;
import java.io.*;


public class JavaFXApplication2 extends Application {

@Override
public void start(Stage primaryStage) throws Exception {
    XSSFWorkbook schedule = new XSSFWorkbook();
    XSSFSheet firstSheet = schedule.createSheet("Dis a sheet");
    XSSFRow firstRow = firstSheet.createRow(0);
    XSSFCell firstCell = firstRow.createCell(0);
    firstCell.setCellValue(25);
    System.out.println(firstCell.getRawValue());

    Button btn = new Button();
    btn.setText("Say 'Hello World'");

    btn.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent e) {
            writeInfoToCell(firstCell,50);
            System.out.println(firstCell.getRawValue());
        }

    });

    //});
    FileOutputStream out = new FileOutputStream(new File("schedule.xlsx"));
    schedule.write(out);
    out.close();
    StackPane root = new StackPane();
    root.getChildren().add(btn);

    Scene scene = new Scene(root, 300, 250);

    primaryStage.setTitle("Hello World!");
    primaryStage.setScene(scene);
    primaryStage.show();

}
public void writeInfoToCell(XSSFCell cell, int information){
    cell.setCellValue(information);
}
/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    launch(args);
}

}