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();
				}
			}
		}
	}
}