session 保存信息和获取信息

1.session中保存信息

@GetMapping("/login")
    public String login(SysUser user, HttpSession session){
        session.setAttribute(user.getId(),user);
        return "成功";
    }

2.session中获取信息

//1.
@GetMapping("/getUserInfo")
    public Object getUserInfo(HttpSession session){
        Object userInfo = session.getAttribute("用户ID");
        return userInfo;
    }
//2.
@GetMapping("/getUserInfo")
    public Object getUserInfo(HttpServletRequest request){
        Object userInfo = request.getSession().getAttribute("用户ID");
        return userInfo;
    }

3.清除session

@GetMapping("/logout")
    public String logout(HttpSession session){
        //清空session
        session.invalidate();
        return "推出成功";
    }