HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE

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@RequestMapping("/demo/{id}")

    @ResponseBody

    public User getUser(@PathVariable("id")Integer id, HttpServletRequest request){

        System.out.println(request.getAttribute(RequestMappingHandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE));

        List<User> list=new ArrayList<>();

        list.add(new User(0,"A"));

        list.add(new User(1,"B"));

        list.add(new User(2,"C"));

        list.add(new User(3,"D"));

        User user = list.get(id);

        return user;

}