public class CustomisedHSSFExcelExporter extends HSSFExcelExporter {

	@Override
	public final void exportEnd(final OutputStream outputStream) throws IOException {

		if (this.xlSheet.getRow(0) != null) {

			for (int r = 0; r < this.xlSheet.getPhysicalNumberOfRows(); r++) {
				Row row = this.xlSheet.getRow(r);

				for (int c = 0; c < row.getPhysicalNumberOfCells(); c++) {
					Cell cell = row.getCell(c);

					if (cell != null) {
						CellStyle style = cell.getCellStyle();

                                                // add a border around each cell
						style.setBorderBottom(CellStyle.BORDER_THIN);
						style.setBottomBorderColor(IndexedColors.GREY_40_PERCENT.getIndex());
						style.setBorderLeft(CellStyle.BORDER_THIN);
						style.setLeftBorderColor(IndexedColors.GREY_40_PERCENT.getIndex());
						style.setBorderRight(CellStyle.BORDER_THIN);
						style.setRightBorderColor(IndexedColors.GREY_40_PERCENT.getIndex());
						style.setBorderTop(CellStyle.BORDER_THIN);
						style.setTopBorderColor(IndexedColors.GREY_40_PERCENT.getIndex());
					}
				}
			}

			int numberOfColumns = this.xlSheet.getRow(0).getPhysicalNumberOfCells();

			for (int i = 0; i < numberOfColumns; i++) {
                                // auto-resize each cell according to its current content
				this.xlSheet.autoSizeColumn(i);
			}

		}

		super.exportEnd(outputStream);
	}
}