Format cell style in Excel document? Java Export Excel

package org.xxx.example.poi;

import org.apache.poi.hssf.usermodel.*;

import org.apache.poi.hssf.util.HSSFColor;

import java.io.FileOutputStream;

import java.io.File;

import java.io.IOException;

public class ExcelCellFormat {

    public static void main(String[] args) {

        //

        // Create an instance of workbook and sheet

        //

        HSSFWorkbook workbook = new HSSFWorkbook();

        HSSFSheet sheet = workbook.createSheet();

        //

        // Create an instance of HSSFCellStyle which will be use to format the

        // cell. Here we define the cell top and bottom border and we also

        // define the background color.

        //

        HSSFCellStyle style = workbook.createCellStyle();

        style.setBorderTop((short) 6); // double lines border

        style.setBorderBottom((short) 1); // single line border

        style.setFillBackgroundColor(HSSFColor.GREY_25_PERCENT.index);

        //

        // We also define the font that we are going to use for displaying the

        // data of the cell. We set the font to ARIAL with 20pt in size and

        // make it BOLD and give blue as the color.

        //

        HSSFFont font = workbook.createFont();

        font.setFontName(HSSFFont.FONT_ARIAL);

        font.setFontHeightInPoints((short) 20);

        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

        font.setColor(HSSFColor.BLUE.index);

        style.setFont(font);

        //

        // We create a simple cell, set its value and apply the cell style.

        //

        HSSFRow row = sheet.createRow(1);

        HSSFCell cell = row.createCell(1);

        cell.setCellValue(new HSSFRichTextString("Hi there... It's me again!"));

        cell.setCellStyle(style);      

        sheet.autoSizeColumn((short) 1);

        //

        // Finally we write out the workbook into an excel file.

        //

        FileOutputStream fos = null;

        try {

            fos = new FileOutputStream(new File("ExcelDemo.xls"));

            workbook.write(fos);

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            if (fos != null) {

                try {

                    fos.flush();

                    fos.close();

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }

    }

}