java利用MultiValueMap提交post请求的form-data参数

大部分时间都是'Content-Type': 'application/json'，flask_appbuilder的服务中很多接口是 multipart/form-data;,

用python调用时，通常情况下

data = json.dumps({ "catalogCode":"region","pageNo": 1, "pageSize": 1000})
headers = {'Token': Token, 'Accept': 'application/json', 'Content-Type': 'application/json;charset=utf-8'}
r = requests.post(user_url, headers=headers, data=data)

form-data时需要如下

data ={ "catalogCode":"region","pageNo": 1, "pageSize": 1000}
headers = {'Token': Token}

r = requests.post(user_url, headers=headers, data=data)

但是在java中，不只是改为'Content-Type': 'multipart/form-data'

还需要用MultiValueMap

 HttpEntity entity = new HttpEntity(req.getRequestBody(), headers);

 HttpEntity<MultiValueMap<String, String>> entity = new HttpEntity<>(map, headers);
ResponseEntity response = restTemplate.exchange(url, httpMethod, entity, respTypes)
if (response != null) {
                    int status = response.getStatusCode().value();
                    rsp.setStatus(status);
                    HttpHeaders rspHeaders = response.getHeaders();
                    if (rspHeaders != null) {
                        Map<String, String> rspHeaderMap = new HashMap<>(8);
                        for (Map.Entry<String, List<String>> entry : rspHeaders.entrySet()) {
                            rspHeaderMap.put(entry.getKey(), entry.getValue().toString());
                        }
                        rsp.setHeader(rspHeaderMap);
                    }
                    rsp.setBody(response.getBody());

这里要改为

 LinkedHashMap linkedHashMap= (LinkedHashMap)req.getRequestBody();
            headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
            MultiValueMap<String, Object> map = new LinkedMultiValueMap<>();
            Iterator it = linkedHashMap.entrySet().iterator();
            while (it.hasNext()){
                Map.Entry entry = (Map.Entry)it.next();
                map.add((String)entry.getKey(),entry.getValue());
            }

            HttpEntity<MultiValueMap<String, Object>> entity = new HttpEntity<>(map, headers);
//            HttpEntity<MultiValueMap<String, String>> entity = new HttpEntity<>(map, headers);

            ParameterizedTypeReference<BaseResponse> respTypes = new ParameterizedTypeReference<BaseResponse>() {};

            try {
                RestTemplate rt = new RestTemplate();

                BaseResponse response =rt.postForObject("http://127.0.0.1:8550/edit/12",
                        entity, BaseResponse.class);