restTemplate 的用法

JSONObject json = new JSONObject();
json.put("mid", mid);
json.put("tid", tid);

 //调用普通接口
        HttpURLConnection httpURLConnection = null;
        BufferedReader ino = null;
        PrintWriter out = null;
        try {
            URL url = new URL(APIurl);
            httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoInput(true);
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setRequestProperty("Content_Type","application/json");
            httpURLConnection.setRequestProperty("Accept_Charset","UTF-8");
            httpURLConnection.setRequestProperty("contentType","UTF-8");
            //发送POST请求参数
            out = new PrintWriter(httpURLConnection.getOutputStream());
//            out = new OutputStreamWriter(httpURLConnection.getOutputStream(),"utf-8");
            out.write(strReqJsonStr);
//            out.println(strReqJsonStr);
            out.flush();
            //读取响应
            if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                StringBuffer content = new StringBuffer();
                String tempStr = null;
                ino = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
                while ((tempStr=ino.readLine()) != null){
                    content.append(tempStr);
                }
                System.out.println("content:"+content.toString());
                //转换成json对象
                JSONObject respJson = JSON.parseObject(content.toString());
                String resultCode = respJson.getString("errCode");
                if("SUCCESS".equals(resultCode)){
                    //成功继续走下面逻辑
                }else{

                    //失败
                }

            }
        return null;

        } catch (RestClientException e) {
            logger.error("调用银商接口出现异常", e.toString() );
            return null;
        }

用RestTemplate 方法实现
private final RestTemplate restTemplate;

HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.add("Content-Type", "application/json;charset=UTF-8");
HttpEntity<String> httpEntity = new HttpEntity<>(JSON.toJSONString(paramsMap), httpHeaders);
ResponseEntity<String> response = restTemplate.exchange(APIurl, POST, httpEntity, String.class);
if (response.getStatusCode() == HttpStatus.OK) {
    JSONObject result = JSON.parseObject(response.getBody());
    if (result.getInteger("code") == 200) {

    }

}