我正在配置 Spring Security。为了验证和授权用户，我覆盖了 configure(AuthenticationManagerBuilder auth)的 WebSecurityConfigurerAdapter .这工作正常。下面是我的代码:

@Override 
protected void configure(AuthenticationManagerBuilder auth) throws Exception { 
    auth 
        .userDetailsService(customUserDetailsService) 
        .passwordEncoder(getPasswordEncoder()); 
} 

但是当我尝试启用方法级别的安全性时，每个操作，使用 @EnableGlobalMethodSecurity(securedEnabled = true)它抛出一个异常:

No AuthenticationManager found

据我了解 AuthenticationManager用于验证和授权用户，我已经在使用 configure(AuthenticationManagerBuilder auth)和 Spring 正在注入(inject) auth对象本身。

为什么我需要注册 AuthenticationManager手动？

@Bean @Override 
public AuthenticationManager authenticationManagerBean() throws Exception { 
    return super.authenticationManagerBean(); 
} 

有什么不同的用途 configure(AuthenticationManagerBuilder auth)和 authenticationManagerBean()供应？

我正在扩展 WebSecurityConfigurerAdapter .为什么我需要提供自定义 AuthenticationManager通过覆盖 authenticationManagerBean() .

请您参考如下方法:

您的配置类扩展 WebSecurityConfigurerAdapter ，它只配置网络安全(不是方法安全):

Provides a convenient base class for creating a WebSecurityConfigurer instance. The implementation allows customization by overriding methods.

所以你的 AuthenticationManager仅用于网络安全。
如果要配置(更改默认值)方法安全性，可以扩展 GlobalMethodSecurityConfiguration :

Base Configuration for enabling global method security. Classes may extend this class to customize the defaults, but must be sure to specify the EnableGlobalMethodSecurity annotation on the subclass.

配置 AuthenticationManager为了方法安全，您可以

覆盖 GlobalMethodSecurityConfiguration#configure :

Sub classes can override this method to register different types of authentication. If not overridden, configure(AuthenticationManagerBuilder) will attempt to autowire by type.

暴露你的AuthenticationManager作为可以由 GlobalMethodSecurityConfiguration Autowiring 的 bean ，见 WebSecurityConfigurerAdapter#authenticationManagerBean :

Override this method to expose the AuthenticationManager from configure(AuthenticationManagerBuilder) to be exposed as a Bean.

只使用一个全局 AuthenticationManager通过 Autowiring 全局 AuthenticationManagerBuild ，见 Spring Security 3.2.0.RC2 Released :

For example, if you want to configure global authentication (i.e. you only have a single AuthenticationManager) you should autowire the AuthenticationMangerBuilder:

@Autowired 
public void configureGlobal(AuthenticationManagerBuilder auth) { 
    // ... configure it ... 
}