# 84.2 改变AuthenticationManager并添加用户账号

如果你提供了一个`AuthenticationManager`、`AuthenticationProvider`、`UserDetailsService`类型的`@Bean`，那么默认的用于`InMemoryUserDetailsManager`的`@Bean`就不会被创建了，所以你可以获得Spring Security可用的全部特性（比如，[不同的认证选项](https://docs.spring.io/spring-security/site/docs/current/reference/htmlsingle/#jc-authentication)）。

添加用户帐户的最简单方法是提供你自己的`UserDetailsService` bean。


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