code: public static String getMethodParamDesc(Method method) {
          if (method.getParameterTypes() == null || method.getParameterTypes().length == 0) {
              return null;
          }
  
          StringBuilder builder = new StringBuilder();
  
          Class<?>[] clzs = method.getParameterTypes();
  
          for (Class<?> clz : clzs) {
              String className = getName(clz);
              builder.append(className).append(PARAM_CLASS_SPLIT);
          }
  
          return builder.substring(0, builder.length() - 1);
      }
docs: 获取method方式的接口参数，以逗号分割，拼接clz列表。 如果没有参数，那么void表示
  
  @param method
  @return