Poi 读取excel 对所有类型进行处理

public static String getCellValue(Cell cell) {
        String cellValue = "";
        if (cell == null) {
            return cellValue;
        }
        // 判断数据的类型
        switch (cell.getCellType()) {
        case Cell.CELL_TYPE_NUMERIC: // 数字
            //short s = cell.getCellStyle().getDataFormat();
            if (HSSFDateUtil.isCellDateFormatted(cell)) {// 处理日期格式、时间格式
                SimpleDateFormat sdf = null;
                // 验证short值
                if (cell.getCellStyle().getDataFormat() == 14) {
                    sdf = new SimpleDateFormat("yyyy/MM/dd");
                } else if (cell.getCellStyle().getDataFormat() == 21) {
                    sdf = new SimpleDateFormat("HH:mm:ss");
                } else if (cell.getCellStyle().getDataFormat() == 22) {
                    sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
                } else {
                    throw new RuntimeException("日期格式错误!!!");
                }
                Date date = cell.getDateCellValue();
                cellValue = sdf.format(date);
            } else if (cell.getCellStyle().getDataFormat() == 0) {//处理数值格式
                cell.setCellType(Cell.CELL_TYPE_STRING);
                cellValue = String.valueOf(cell.getRichStringCellValue().getString());
            }
            break;
        case Cell.CELL_TYPE_STRING: // 字符串
            cellValue = String.valueOf(cell.getStringCellValue());
            break;
        case Cell.CELL_TYPE_BOOLEAN: // Boolean
            cellValue = String.valueOf(cell.getBooleanCellValue());
            break;
        case Cell.CELL_TYPE_FORMULA: // 公式
            cellValue = String.valueOf(cell.getCellFormula());
            break;
        case Cell.CELL_TYPE_BLANK: // 空值
            cellValue = null;
            break;
        case Cell.CELL_TYPE_ERROR: // 故障
            cellValue = "非法字符";
            break;
        default:
            cellValue = "未知类型";
            break;
        }
        return cellValue;
    }