@RequestMapping(method=RequestMethod.GET)

    public ModelAndView allUsers(@RequestParam int page){

        ModelAndView mav = new ModelAndView();

        mav.setViewName("list");

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

        list.add("zhangsan");

        list.add("lisi");

        list.add(page+"");

        mav.addObject("list", list);

        return mav;

    }

    public ModelAndView allUsers(@RequestParam(defaultValue="1",required=false) int page){