public String compareExcelValue(Sheet sheet) {
	int totalRows = sheet.getPhysicalNumberOfRows();// 得到Excel的行数
	int totalCells = 0;
	if (totalRows >= 1 && sheet.getRow(0) != null) {
		// 得到Excel的列数(前提是有行数)
		totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
	} else {
		return "上传的Excel没有数据！";
	}
	SimpleDateFormat forma1 = new SimpleDateFormat("yyyy/MM/dd");
	SimpleDateFormat forma2 = new SimpleDateFormat("yyyy.MM.dd");
	SimpleDateFormat forma3 = new SimpleDateFormat("yyyy-MM-dd");
	// 设置lenient为false.
	// 否则SimpleDateFormat会比较宽松地验证日期，比如2007/02/29会被接受，并转换成2007/03/01
	forma1.setLenient(false);
	forma2.setLenient(false);
	forma3.setLenient(false);
	for (int c = 0; c < totalCells; c++) {
		// 循环遍历每一列，获取第一行标题行内容
		Cell cell = sheet.getRow(0).getCell(c);
		// 判断标题内容是否是日期时间
		if (cell.getStringCellValue().indexOf("日期") != -1 || cell.getStringCellValue().indexOf("时间") != -1) {
			for (int r = 1; r < totalRows; r++) {
				// 循环获取这一列的每一行
				String formatTime = getValue(sheet.getRow(r).getCell(c));
				try {
					if (formatTime.indexOf("/") != -1) {
						forma1.parse(formatTime);
					} else if (formatTime.indexOf(".") != -1) {
						forma2.parse(formatTime);
					} else if (formatTime.indexOf("-") != -1) {
						forma3.parse(formatTime);
					} else {
						return "Excel第" + (r + 1) + "行第" + c + "列时间格式有误！";
					}
				} catch (ParseException e) {
					// 如果throw java.text.ParseException
					// 或者NullPointerException，就说明格式不对
					return "Excel第" + (r + 1) + "行第" + c + "列时间格式有误！";
				}
			}
		}
	}
	return "true";
}

public String getValue(Cell cell) {
	String cellValue = "";
	switch (cell.getCellType()) {
	case Cell.CELL_TYPE_STRING:
		cellValue = cell.getStringCellValue();
		break;
	case Cell.CELL_TYPE_BOOLEAN:
		cellValue = String.valueOf(cell.getBooleanCellValue());
		break;
	case Cell.CELL_TYPE_NUMERIC:
		if (DateUtil.isCellDateFormatted(cell)) {
			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
			cellValue = sdf.format(cell.getDateCellValue());
		} else {
			DataFormatter dataFormatter = new DataFormatter();
			cellValue = dataFormatter.formatCellValue(cell);
		}
		break;
	default:
		cellValue = "";
		break;
	}
	return cellValue;
}

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