spring 中RestTemplate发送json post方式请求

JSONObject jsonData = new JSONObject();
jsonData.put("user_ip", "teset");
jsonData.put("actions", new JSONArray());

String data = jsonData.toString();
HttpHeaders headers = new HttpHeaders();
MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
headers.setContentType(type);
HttpEntity<String> formEntity = new HttpEntity<String>(data, headers);
String res = restTemplate.postForObject(http, formEntity,String.class);