java开发数据接口如何获取http请求体body中的json格式的参数

 public static String receivePost(HttpServletRequest request) throws IOException, UnsupportedEncodingException {

        // 读取请求内容
        BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream()));
        String line = null;
        StringBuilder sb = new StringBuilder();
        while((line = br.readLine())!=null){
            sb.append(line);
        }

        // 将资料解码
        String reqBody = sb.toString();
        return URLDecoder.decode(reqBody, HTTP.UTF_8);
    }

把它转成map，遍历map