springmvc向视图层传递数据

1.ModelAndView

这种不再介绍，不懂得看https://blog.csdn.net/qq_41534115/article/details/83859874

2.使用model对象

 @RequestMapping("/find")
    public String findUser(Model model){
        User user=new User("jie","123");
        //返回的数据
        model.addAttribute("user",user);
        //返回指定页面
        return "user";
    }

3.HttpServletRequest

默认情况下是转发：forward
重定向：redirect

 @RequestMapping("find1")
    public String findUser1(HttpServletRequest req){
        User user=new User("jieqq","123");
        req.setAttribute("user",user);
        return "user";//转发到页面
        //return  "forward:/user.jsp";//转发
        //return  "redirect:/user.jsp";//重定向
    }