code: public Class getResClass(String service, String methodName) {
          String key = service + "#" + methodName;
          Class reqClass = responseClassCache.get(key);
          if (reqClass == null) {
              // 读取接口里的方法参数和返回值
              String interfaceClass = ConfigUniqueNameGenerator.getInterfaceName(service);
              Class clazz = ClassUtils.forName(interfaceClass, true);
              loadProtoClassToCache(key, clazz, methodName);
          }
          return responseClassCache.get(key);
      }
docs: 从缓存中获取返回值类
  
  @param service    接口名
  @param methodName 方法名
  @return 请求参数类