@RequestMapping(value = "/listByUserId") public PageInfo listByUserId(User user) { }

What I am receiving is a User object, in which the User attribute id, I want to set an initial value for it, that is, there is an initial value when the id parameter is not sent. I use @RequestParam to specify the id attribute defalutValue, but it does not work. Is there any way to achieve this? It is best not to change to the User class