ModelAttribute 和 RequestParam, PathVariable 之间的搭配

一： ModelAttribute RequestParam 搭配categoryId不会被添加到model

@RequestMapping(value = "/list", method = RequestMethod.GET)
public String list(@ModelAttribute("categoryId") @RequestParam("categoryId") Long categoryId, Model model) {
return viewName("list");
}

二：ModelAttribute PathVariable 搭配categoryId会被添加到model

@RequestMapping(value = "/list/{categoryId}", method = RequestMethod.GET)
public String list(@ModelAttribute("categoryId") @PathVariable("categoryId") Long categoryId, Model model) {
return viewName("list");
}