Java SpringMVC框架学习（二）httpServeltRequest和Model传值的区别

HttpServletRequest

为什么大多程序在controller中给jsp传值时使用model.addAttribute()而不使用httpServeletRequest.setAttribute()？

事实上model数据，最终spring也是写到HttpServletRequest属性中，只是用model更符合mvc设计,减少各层间耦合。

@RequestMapping(value="/list",method=RequestMethod.GET)
    public String list(Model model) {          //前台输出必须使用形如${ul.value.属性名 }的形式
        model.addAttribute("userList",userList);
        return "user/userList";
    }

    @RequestMapping(value="/userlist",method=RequestMethod.GET)
    public String list(HttpServletRequest request) {      //前台输出必须使用形如${user.id }的形式
        List<User> userList = new ArrayList<User>();
        userList.add(new User("1","yonghu1","121","1@qq.com"));
        userList.add(new User("2","yonghu2","122","2@qq.com"));
        userList.add(new User("3","yonghu3","123","3@qq.com"));
        request.setAttribute("userList", userList);
        return "user/userList";
    }

Model、ModelAndView

Model

@ModelAttribute

ModelAndView