Java SpringMVC框架學習(二)httpServeltRequest和Model傳值的區別
阿新 • • 發佈:2018-05-19
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為什麽大多程序在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) { //前臺輸出必須使用形如${ul.value.屬性名 }的形式 model.addAttribute("userList",userList);return "user/userList"; } @RequestMapping(value="/userlist",method=RequestMethod.GET) public String list(HttpServletRequest request) { //前臺輸出必須使用形如${user.id }的形式 List<User> userList = new ArrayList<User>(); userList.add(new User("1","yonghu1","121","[email protected]")); userList.add(new User("2","yonghu2","122","[email protected]")); userList.add(new User("3","yonghu3","123","[email protected]")); request.setAttribute("userList", userList); return "user/userList"; }
Java SpringMVC框架學習(二)httpServeltRequest和Model傳值的區別