spring-07-Controller如何使用Session

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@RequestMapping("/login3.do")    public String checkLogin3(            String username,            String password,            ModelMap model,            HttpSession session){//加session参数        if("root".equals(username) && "123".equals(password)){            model.put("username", username);            //给session赋值            session.setAttribute("username", username);            return "ok";        }else{            model.put("msg", "用户名或密码错误");            return "login";        }    }

<%@page pageEncoding="utf-8"contentType="text/html; charset=utf-8"%><html>  <head></head>  <body style = "font-size:30px;">    <h2>${username}登录成功</h2>    session的内容:${sessionScope.username}  </body></html>
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