2.java

public Response test(Session session){
    UserInfo user = UserDao.queryByUserId(session.getUserId());
    
    if(user==null){
       reutrn new Response();
    }
    
    return do(session.getUserId());
}

public Response do(String UserId)
  UserInfo user = UserDao.queryByUserId(session.getUserId());
  ......
  return new Response(); 
}