后台获取session：

@RequestMapping("/usrlogin")public ModelAndView usrlogin(@RequestParam String usrid,      @RequestParam String passwd) {    HttpSession session = getSession();    User user = new User();    user = userMapper.getUserByUsridAndPasswd(usrid, passwd);    if (null != user) {      session.setAttribute("user", user.getUser_id());//            User user1=(User)session.getAttribute("user");//            System.out.println(user1.getUser_name());            return new ModelAndView("main");    } else {      return new ModelAndView("error");    }  }          public static HttpSession getSession() {   HttpSession session = null;   try {     session = getRequest().getSession();   } catch (Exception e) {}     return session; }   public static HttpServletRequest getRequest() {   ServletRequestAttributes attrs =(ServletRequestAttributes) RequestContextHolder.getRequestAttributes();   return attrs.getRequest(); }

前台jsp取值：

<%        HttpSession s = request.getSession();       %><%=s.getAttribute("user")%>

 

@RequestMapping("/usrlogin")public ModelAndView usrlogin(@RequestParam String usrid,@RequestParam String passwd) {HttpSession session = getSession();User user = new User();user = userMapper.getUserByUsridAndPasswd(usrid, passwd);if (null != user) {session.setAttribute("user", user.getUser_id());//			User user1=(User)session.getAttribute("user");//			System.out.println(user1.getUser_name());return new ModelAndView("main");} else {return new ModelAndView("error");}}      public static HttpSession getSession() { HttpSession session = null; try { session = getRequest().getSession(); } catch (Exception e) {} return session; } public static HttpServletRequest getRequest() { ServletRequestAttributes attrs =(ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); return attrs.getRequest(); }