RestTemplate 如何发送json请求呢？

实现思路:
    直接借助HttpHeaders对象和HttpEntity对象即可实现restTemplate发送json信息
 

 JSONObject json = new JSONObject();
                    json.put("startDate", start_date);
                    json.put("endDate", end_date);
                    json.put("info", info); 

                    HttpHeaders headers = new HttpHeaders();
                    MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
                    headers.setContentType(type);
                    headers.add("Accept", MediaType.APPLICATION_JSON.toString());
                    HttpEntity<String> formEntity = new HttpEntity<String>(json.toString(), headers);
                    String s= restTemplate.postForEntity(url,formEntity,String.class).getBody();