RestTemplate 遇到泛型參數時，用exchange方法

#發送參數：

EpbParam param = new EpbParam();
param.setData(CouponOrder);

#參數 httpEntity組裝

 HttpHeaders headers = new HttpHeaders();
 headers.setContentType(MediaType.APPLICATION_JSON);
 HttpEntity<EpbParam<CouponOrder>> entity = new HttpEntity<EpbParam<CouponOrder>>(param, headers);

#返回值 ParameterizedTypeReference

ParameterizedTypeReference parameterizedTypeReference = new ParameterizedTypeReference<EpbResponse<ThirdPartyResponse,CouponOrder>>() {};
ResponseEntity<EpbResponse<ThirdPartyResponse,CouponOrder>> result = restTemplate.exchange(url, HttpMethod.POST, entity, parameterizedTypeReference);result.getBody();