readText

/**
	 * 转换excel中的内容为String
	 * @author www.gbsou.com
	 * @param cell
	 * @return String
	 */
	private String convertCell(HSSFCell cell) {
		NumberFormat formater = NumberFormat.getInstance();
		formater.setGroupingUsed(false);
		String cellValue = "";
		if (cell == null) {
			return cellValue;
		} else {
			switch (cell.getCellType()) {
			case HSSFCell.CELL_TYPE_NUMERIC:
				cellValue = formater.format(cell.getNumericCellValue());
				break;
			case HSSFCell.CELL_TYPE_STRING:
				cellValue = cell.getStringCellValue();
				break;
			case HSSFCell.CELL_TYPE_FORMULA:
				cellValue = cell.getStringCellValue();
				break;
			case HSSFCell.CELL_TYPE_BLANK:
				cellValue = cell.getStringCellValue();
				break;
			case HSSFCell.CELL_TYPE_BOOLEAN:
				cellValue = Boolean.valueOf(cell.getBooleanCellValue())
						.toString();
				break;
			case HSSFCell.CELL_TYPE_ERROR:
				cellValue = String.valueOf(cell.getErrorCellValue());
				break;
			default:
				cellValue = "";
			}
		}
		return cellValue.trim();
	}