有个需求，就是需要再规定ip范围内登录，想用shiro登录授权，怎么个思路实现，nutzboot，，，，，，，，，，
@Override
protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
SimpleShiroToken upToken = (SimpleShiroToken) token;

    User user = dao().fetch(User.class, (Long)upToken.getPrincipal());
    if (user == null)
       return null;
    return new SimpleAccount(user.getId(), user.getPassword(), getName());
}

是在这里实现吗