RestTemplate 发送请demo

                            RestTemplate restTemplate = new RestTemplate();
                            MultiValueMap<String, Object> paramMap = new LinkedMultiValueMap<String, Object>();
                            paramMap.add("msg","测试");
                            HttpHeaders headers = new HttpHeaders();
                            headers.setContentType(MediaType.APPLICATION_JSON);
                            headers.set("charset","utf-8");

                            HttpEntity httpEntity = new HttpEntity(paramsEncode,headers);
                            //HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(paramMap,headers);
                            ResponseEntity<String> responseEntity = restTemplate.exchange(url, HttpMethod.POST, httpEntity, String.class);
                            ResResultDto dto = ResResultDto.format(responseEntity.getBody());