转发和重定向

1)转发 (默认)

   return "逻辑视图";

2)重定向

return "redirect:地址" //到请求地址. 

@RequestMapping("/modify/{id}")
    public String getUserById(@PathVariable String id,Model model)
            throws ServletException, IOException {
        User user = userService.getUserById(id);
        model.addAttribute("user", user);
        return "usermodify";
    }
    
    @RequestMapping("/modifyexe")
    public String modify(User user,HttpSession session)
            throws ServletException, IOException {
        user.setModifyBy(((User)session.getAttribute(Constants.USER_SESSION)).getId());
        user.setModifyDate(new Date());
        if(userService.modify(user)){
            return "redirect:query";
        }else{
            return "usermodify";
        }
    }