Java SpringMVC框架學習（二）httpServeltRequest和Model傳值的區別

HttpServletRequest

為什么大多程序在controller中給jsp傳值時使用model.addAttribute()而不使用httpServeletRequest.setAttribute()？

事實上model數據，最終spring也是寫到HttpServletRequest屬性中，只是用model更符合mvc設計,減少各層間耦合。

@RequestMapping(value="/list",method=RequestMethod.GET)
    public String list(Model model) {          //前台輸出必須使用形如${ul.value.屬性名 }的形式
        model.addAttribute("userList",userList);
        return "user/userList";
    }
     
    @RequestMapping(value="/userlist",method=RequestMethod.GET)
    public String list(HttpServletRequest request) {      //前台輸出必須使用形如${user.id }的形式
        List<User> userList = new ArrayList<User>();
        userList.add(new User("1","yonghu1","121","[e-mail]"));
        userList.add(new User("2","yonghu2","122","[e-mail]"));
        userList.add(new User("3","yonghu3","123","[e-mail]"));
        request.setAttribute("userList", userList);
        return "user/userList";
    }

 Model、ModelAndView

Model

@ModelAttribute

 

ModelAndView