spring_reference/IX. ‘How-to’ guides/71.2. Change the Authentica...

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### 71.2. 改变AuthenticationManager并添加用户账号
如果你提供了一个AuthenticationManager类型的`@Bean`那么默认的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](http://docs.spring.io/spring-security/site/docs/current/reference/htmlsingle/#jc-authentication))。
Spring Security也提供了一个方便的AuthenticationManagerBuilder可用于构建具有常见选项的AuthenticationManager。在一个webapp中推荐将它注入到WebSecurityConfigurerAdapter的一个void方法中比如
```java
@Configuration
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
@Autowired
public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
auth.inMemoryAuthentication()
.withUser("barry").password("password").roles("USER"); // ... etc.
}
// ... other stuff for application security
}
```
如果把它放到一个内部类或一个单独的类中,你将得到最好的结果(也就是不跟很多其他`@Beans`混合在一起将允许你改变实例化的顺序)。[secure web sample](http://github.com/spring-projects/spring-boot/tree/master/spring-boot-samples/spring-boot-sample-web-secure)是一个有用的参考模板。
如果你遇到了实例化问题比如使用JDBC或JPA进行用户详细信息的存储那将AuthenticationManagerBuilder回调提取到一个GlobalAuthenticationConfigurerAdapter放到init()方法内以防其他地方也需要authentication manager可能是个不错的选择比如
```java
@Configuration
public class AuthenticationManagerConfiguration extends
GlobalAuthenticationConfigurerAdapter {
@Override
public void init(AuthenticationManagerBuilder auth) {
auth.inMemoryAuthentication() // ... etc.
}
}
```