springboot @Configuration @bean注解作用

<!-- 配置shiro框架提供过滤器工厂 -->
    <bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean">
        <!-- 注入shiro核心组件安全管理器 -->
        <property name="securityManager" ref="securityManager"></property>
        <!-- 注入相关页面 -->
        <property name="loginUrl" value="/login.jsp"></property>
        <property name="unauthorizedUrl" value="/unauthorized.jsp"></property>
        <!-- 配置过滤器链：配置项目发出url对应拦截规则：指定什么url要求具有什么样权限 -->
        <property name="filterChainDefinitions">
            <value>
                /css/**=anon
                /js/**=anon
                /validatecode.jsp*=anon
                /images/**=anon
                /login.jsp=anon
                /service/**=anon
                /**=authc
            </value>
        </property>
    </bean>
   <!-- 配置安全管理器 -->
    <bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">
         <property name="realms" ref="bosRealm"></property>
         <!-- 使用缓存 -->
         <property name="cacheManager" ref="cacheManager"></property>
    </bean>

    <!--  配置缓存管理器-->
    <bean id="cacheManager" class="org.apache.shiro.cache.ehcache.EhCacheManager">
         <!-- 加载ehcache的配置文件，指定缓存策略 -->
        <property name="cacheManager" ref="ehcacheManager"></property>
    </bean> 

    <!-- 开启shiro注解支持 -->
    <bean class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator">
        <!-- 强制使用cglib代理 -->
        <property name="proxyTargetClass" value="true"></property>
    </bean>
    <!-- 配置切面  目的验权，判断当前用户是否有权限调用service层方法 -->
    <bean class="org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor"></bean>

@Configuration
public class ShiroConfig {
    @Bean
    public ShiroFilterFactoryBean shirFilter(SecurityManager securityManager) {
        ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
        shiroFilterFactoryBean.setSecurityManager(securityManager);

        Map<String, String> filterChainDefinitionMap = new HashMap<String, String>();
        shiroFilterFactoryBean.setLoginUrl("/login");
        shiroFilterFactoryBean.setUnauthorizedUrl("/unauthc");
        shiroFilterFactoryBean.setSuccessUrl("/home/index");
        
        filterChainDefinitionMap.put("/*", "anon");
        filterChainDefinitionMap.put("/authc/index", "authc");
        return shiroFilterFactoryBean;
    }

    @Bean
    public HashedCredentialsMatcher hashedCredentialsMatcher() {
        HashedCredentialsMatcher hashedCredentialsMatcher = new HashedCredentialsMatcher();
        hashedCredentialsMatcher.setHashAlgorithmName(PasswordHelper.ALGORITHM_NAME); 
        hashedCredentialsMatcher.setHashIterations(PasswordHelper.HASH_ITERATIONS); 
        return hashedCredentialsMatcher;
    }

    @Bean
    public EnceladusShiroRealm shiroRealm() {
        EnceladusShiroRealm shiroRealm = new EnceladusShiroRealm();
        shiroRealm.setCredentialsMatcher(hashedCredentialsMatcher()); 
        return shiroRealm;
    }

    @Bean
    public SecurityManager securityManager() {
        DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
        securityManager.setRealm(shiroRealm());
        return securityManager;
    }

    @Bean
    public PasswordHelper passwordHelper() {
        return new PasswordHelper();
    }
}