文章参考： http://blog.csdn.net/foggysource/article/details/39456963

首先是http的配置，authentication-manager-ref="authenticationManager"指定了默认的authentication-manager
<http auto-config="true" authentication-manager-ref="authenticationManager">
               ... ...
        <logout logout-url="/dynamic/j_spring_security_logout"
            logout-success-url="/login.html" invalidate-session="true" />

        <custom-filter before="REMEMBER_ME_FILTER" ref="tokenLoginFilter" /> 

</http>

下面是我的两个authentication-manager配置

    <authentication-manager id="authenticationManager">
        <authentication-provider user-service-ref="userDetailsServiceImpl">
            <!-- 用于密码的认证 -->
            <password-encoder ref="userPasswordEncoder" />
        </authentication-provider>
    </authentication-manager>
    
    <authentication-manager id="equalAuthenticationManager">
         <authentication-provider user-service-ref="userDetailsServiceImpl">
            <!--用于不需要密码的认证 -->
            <password-encoder ref="equalPasswordEncoder" />
        </authentication-provider>
    </authentication-manager>

OAuth2.0学习（4-4）关于系统中有多少个 authenticationManager