java - spring security 无法获取已经登陆的用户ID？

Question

    Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();

直接抛异常 显示为null；

Answer 1

Thanks for the invitation! It must be intercept-url. This URL can obtain the logged-in user.

<intercept-url pattern="/你的URL或者包含你的URL的配置" access="..." />

Answer 2

If you put this together, who can tell which method returned null?