老师你好，我想问一下关于spring整合shiro配置的相关问题。

@Configuration
public class ShiroConfig {

    @Bean("securityManager")
    public SecurityManager securityManager(OAuth2Realm oAuth2Realm) {
        DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
        securityManager.setRealm(oAuth2Realm);
        securityManager.setRememberMeManager(null);
        return securityManager;
    }

    @Bean("shiroFilter")
    public ShiroFilterFactoryBean shiroFilter(SecurityManager securityManager, OAuth2Filter oAuth2Filter) {
        ShiroFilterFactoryBean shiroFilter = new ShiroFilterFactoryBean();
        shiroFilter.setSecurityManager(securityManager);

        Map<String, Filter> filters = new HashMap<>();
        filters.put("oauth2", oAuth2Filter);
        shiroFilter.setFilters(filters);

        Map<String, String> filterMap = new LinkedHashMap<>();
        filterMap.put("/webjars/**", "anon");
        filterMap.put("/druid/**", "anon");
        filterMap.put("/app/**", "anon");
        filterMap.put("/sys/login", "anon");
        filterMap.put("/swagger/**", "anon");
        filterMap.put("/v2/api-docs", "anon");
        filterMap.put("/swagger-ui.html", "anon");
        filterMap.put("/swagger-resources/**", "anon");
        filterMap.put("/captcha.jpg", "anon");
        filterMap.put("/user/register", "anon");
        filterMap.put("/user/login", "anon");
        filterMap.put("/test/**", "anon");
        filterMap.put("/**", "oauth2");

        shiroFilter.setFilterChainDefinitionMap(filterMap);

        return shiroFilter;
    }

    @Bean("lifecycleBeanPostProcessor")
    public LifecycleBeanPostProcessor lifecycleBeanPostProcessor() {
        return new LifecycleBeanPostProcessor();
    }

    @Bean
    public AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor(SecurityManager securityManager) {
        AuthorizationAttributeSourceAdvisor advisor = new AuthorizationAttributeSourceAdvisor();
        advisor.setSecurityManager(securityManager);
        return advisor;
    }

}

比如这里添加好之后，spring容器里有了SecurityManager，ShiroFilterFactoryBean ，LifecycleBeanPostProcessor ，AuthorizationAttributeSourceAdvisor 这四个bean的实例。
既然bean的name可以任意指定或者不指定，那spring怎么为shiro提供比如SecurityManager呢？只能通过bean的类型去容器里找吗？或者如果在这个配置类添加多个bean 类型都是SecurityManager，这时候spring如何处理？我试了添加多个SecurityManager类型的bean，运行没什么问题，但是原理没搞懂。