POI取得Cell的字符串(String)值

public final static String DATE_OUTPUT_PATTERNS = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";

public String getCellValue(Cell cell) {
		String ret;
		switch (cell.getCellType()) {
		case Cell.CELL_TYPE_BLANK:
			ret = "";
			break;
		case Cell.CELL_TYPE_BOOLEAN:
			ret = String.valueOf(cell.getBooleanCellValue());
			break;
		case Cell.CELL_TYPE_ERROR:
			ret = null;
			break;
		case Cell.CELL_TYPE_FORMULA:
			Workbook wb = cell.getSheet().getWorkbook();
			CreationHelper crateHelper = wb.getCreationHelper();
			FormulaEvaluator evaluator = crateHelper.createFormulaEvaluator();
			ret = getCellValue(evaluator.evaluateInCell(cell));
			break;
		case Cell.CELL_TYPE_NUMERIC:
			if (DateUtil.isCellDateFormatted(cell)) { 
				Date theDate = cell.getDateCellValue();
				ret = simpleDateFormat.format(theDate);
			} else { 
				ret = NumberToTextConverter.toText(cell.getNumericCellValue());
			}
			break;
		case Cell.CELL_TYPE_STRING:
			ret = cell.getRichStringCellValue().getString();
			break;
		default:
			ret = null;
		}
		
		return ret; //有必要自行trim
	}
}

文章引用：http://goro.iteye.com/blog/1689096