java 泛型返回

	@ApiOperation("获取服务订单详情")
	@GetMapping("getServiceOrderDetail")
	public  T getServiceOrderDetail(
			@ApiParam(required = true, value = "服务类型") @RequestParam String QRCodeType,
			@ApiParam(required = true, value = "服务ID") @RequestParam String businessId) {

		return orderServiceService.getServiceOrderDetail(QRCodeType, businessId);
	}

	/**
	 * 获取服务详情
	 */
	 T getServiceOrderDetail(String qrCodeType, String businessId);

    @Override
    public  T getServiceOrderDetail(String qrCodeType, String businessId) {
	    OrderCheckoutStrategy checkoutStrategy = OrderCheckoutStrategyFactory.getOrderCheckoutStrategy(qrCodeType);
	    return checkoutStrategy.getOrderDetail(businessId);
    }

public interface OrderCheckoutStrategy {

     T getOrderDetail(String businessId);
}

    @Override
    public  T getOrderDetail(String businessId) {
        //查询用户卡券是否符合核销要求
//        BaseUserCardDTO baseUserCardDTO = userExport.queryUserCardByCardId(businessId);
//        AssertUtils.check(Objects.nonNull(baseUserCardDTO),OrderResultCode.USER_CARD_ERROR);

        BaseUserCardDTO baseUserCardDTO = userExport.queryUserCardInfoByCardId(Integer.valueOf(businessId));
        AssertUtils.check(Objects.nonNull(baseUserCardDTO),OrderResultCode.USER_CARD_NOT_EXIST);

        BaseMerchantCardDTO cardDTO = merchantCardExport.getBaseMerchantSettlementCard(baseUserCardDTO.getMerchantCardId());

        cardDTO.setAvailableDateConvert(DateUtils.format(cardDTO.getAvailableDate(), PatternConstant.DAY_PATTERN));
        cardDTO.setCardTypeDesc(MerchantCardTypeEnum.getUserShowDescBySatus(cardDTO.getCardType()));
//        cardDTO.setPhone();
//        cardDTO.setNickName();

        return (T)cardDTO;
    }