public ResponseVO<User> loginMethod(String uname, String upwd, String uyzm, HttpServletRequest request){
String yzmSession=(String) request.getSession().getAttribute("yzmSession");
if(!yzmSession.equals(uyzm)){
throw new UserLoginException("验证码错误!");
}
User user=userService.loginMethod(uname,upwd);
request.getSession().setAttribute("user",user);
return new ResponseVO<User>(200,"登录成功!",user);
}
request.getSession().getAttribute("yzmSession")
请问这一行的详细意思是什么?为什么用这几个词?(尽量详细些)