RestTemplate Post请求，参数传不过去 400 请求报错 

开局一段儿话，异常全靠猜。没JB你说个代码。######

HttpHeaders headers = new HttpHeaders(); headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON)); headers.add("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36"); //封装参数，千万不要替换为Map与HashMap，否则参数无法传递 MultiValueMap<String, String> params= new LinkedMultiValueMap<>(); //添加请求的参数 params.add("hello", "hello");             //必传 params.add("world", "world");           //选传 HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<>(params, headers);