【资料图】
创建请求
创建请求头：
Map requestBody = new HashMap<>();requestBody.put("userId", userId);requestBody.put("userName", userName); 创建请求体：
HttpHeaders requestHeader = new HttpHeaders();requestHeader.add("cookie", "cookie");requestHeader.add("userInfo", "{userId:101,userName:userName}");创建请求方式：
HttpEntity> httpEntity = new HttpEntity<>(requestHeader);RestTemplate restTemplate = new RestTemplate(); POST请求
restTemplate发送POST请求时可以通过如下方法获取ResponseEntity：
ResponseEntity responseEntity = restTemplate.postForEntity(url, httpEntity, JSONObject.class);或用以下方法获取jsonObject：
JSONObject jsonObject = restTemplate.postForObject(url, httpEntity, JSONObject.class);GET请求
GET请求没有相应的方法，只能用exchange方法获取ResponseEntity：
ResponseEntity responseEntity = restTemplate.exchange(url, HttpMethod.GET, httpEntity, JSONObject.class, requestBody); 若出现如下报错：
Not enough variables available to expand
则是因为RestTemplate认为大括号{}为占位符，需要将请求头中的{userId:101,userName:userName}改为{\"userId\":\"101\",\"userName\":\"userName\"}
