code: public static BeanParser getBeanParser(Method method) {
      Type returnType = method.getReturnType();
      if (isCompletableFutureType(method.getReturnType())) {
        returnType = getActualReturnType(method);
      }
      BeanParser beanParser = typeBeanParserMap.get(returnType);
      if (beanParser != null) {
        return beanParser;
      }
      return defaultBeanParser;
    }
docs: 获取{@link BeanParser}