private  static String getCellValue(Cell cell) {
	    if (cell == null) {
	        return "";
	    }
	    if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
	        return cell.getStringCellValue();
	    } else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
	        return cell.getNumericCellValue() + "";
	    } else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
	        return cell.getBooleanCellValue() + "";
	    }else if(cell.getCellType() == Cell.CELL_TYPE_BLANK){
	        return cell.getStringCellValue();
	    }else if(cell.getCellType() == Cell.CELL_TYPE_ERROR){
	        return cell.getErrorCellValue() + "";
	    } 
	    else if(cell.getCellType()==Cell.CELL_TYPE_BLANK){
			return ""; 
	    }
	    else {
	        return null;
	    }
	}