利用 redirectAttributes 为重定向后的页面传参,但是在最终的showcustomer.jsp中取不到message的值,怎么办？

ps:由于jsp文件都在WEB-INF/jsp下面，所以不能直接重定向到jsp页面，必须经过中间那步showcustomer的请求

@RequestMapping(value="addcustomer", method=RequestMethod.POST)
    public String addCustomer(String customer,RedirectAttributes redirectAttributes) {
        redirectAttributes.addFlashAttribute("message","Added successfully.");
        return "redirect:showcustomer";  
    }

@RequestMapping(value="showcustomer", method=RequestMethod.GET)
    public ModelAndView addCustomer() {
        ModelAndView mv = new ModelAndView ();
        mv.setViewName("customer/showcustomer");
        return mv;
    }
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FROM 1.202.152.*