spingBoot RestTemplate get和post请求封装

public ResponseEntity<String> sendParamsMapForResponseEntity(String url, HttpMethod httpMethod,
            Map<String, String> headersMap, Map<String, Object> paramsMap) {
        HttpHeaders httpHeaders = null;
        if (MapUtils.isNotEmpty(headersMap)) {
            httpHeaders = new HttpHeaders();
            for (Map.Entry<String, String> entry : headersMap.entrySet()) {
                httpHeaders.add(entry.getKey(), entry.getValue());
            }
        }

        StringBuffer urlStringBuffer = new StringBuffer(url);

        HttpEntity<Object> httpEntity = null;
        if (HttpMethod.GET.equals(httpMethod)) {
            if (MapUtils.isNotEmpty(paramsMap)) {
                urlStringBuffer.append("?");
                int index = 0;
                for (Map.Entry<String, Object> entry : paramsMap.entrySet()) {
                    if (index == 0) {
                        urlStringBuffer.append(entry.getKey()).append("=").append(entry.getValue());
                    } else {
                        urlStringBuffer.append("&").append(entry.getKey()).append("=").append(entry.getValue());
                    }
                    index++;
                }
            }
            httpEntity = new HttpEntity<Object>(httpHeaders);
        } else {
            if (MapUtils.isNotEmpty(headersMap)
                    && MediaType.APPLICATION_JSON_VALUE.equals(headersMap.get(HttpHeaders.CONTENT_TYPE))) {
                httpEntity = new HttpEntity<Object>(JSON.toJSONString(paramsMap), httpHeaders);
            } else {
                httpEntity = new HttpEntity<Object>(paramsMap, httpHeaders);
            }
        }
        ResponseEntity<String> responseEntity = baseRestTemplate.exchange(urlStringBuffer.toString(), httpMethod,
                httpEntity, String.class);

        return responseEntity;
    }

spingBoot RestTemplate get和post请求封装