java – 使用CAS Spring Security实现SSO

我正在尝试使用CAS和 Spring Security在多个Web应用程序中实现SSO.预期案例：
CAS – http：// localhost：8080 / cas /
应用程序受保护的内容 – http：//localhost:8081/cas-client1/secure/index.html
应用B受保护的内容 – http：//localhost:8081/cas-client2/secure/index.html

1)当用户访问cas-client1时,将提示CAS登录表单并触发认证.
2)相同的用户访问cas-client2,应该识别以前的登录,并且不会提示登录表单

但是,我未能执行第2步.CAS登录表单仍然提示用户,因此需要双重登录.我的Spring Security配置中是否有任何错误设置：

<security:http entry-point-ref="casAuthenticationEntryPoint" auto-config="true">
    <security:intercept-url pattern="/secure/**" access="ROLE_USER" />
    <security:custom-filter position="CAS_FILTER" ref="casAuthenticationFilter" />
  </security:http>

  <bean id="casAuthenticationEntryPoint" class="org.springframework.security.cas.web.CasAuthenticationEntryPoint">
    <property name="loginUrl" value="http://localhost:8080/cas/login" />
    <property name="serviceProperties" ref="serviceProperties" />
  </bean>

  <bean id="serviceProperties" class="org.springframework.security.cas.ServiceProperties">
    <!-- http://localhost:8081/cas-client2 for app 2-->
    <property name="service" value="http://localhost:8081/cas-client1/j_spring_cas_security_check" />
  </bean>

  <security:authentication-manager alias="authenticationManager">
    <security:authentication-provider ref="casAuthenticationProvider" />
  </security:authentication-manager>

  <bean id="casAuthenticationFilter" class="org.springframework.security.cas.web.CasAuthenticationFilter">
    <property name="authenticationManager" ref="authenticationManager" />
    <property name="authenticationFailureHandler">
      <bean class="org.springframework.security.web.authentication.SimpleUrlAuthenticationFailureHandler">
        <property name="defaultFailureUrl" value="/casfailed.jsp" />
      </bean>
    </property>
  </bean>

  <bean id="casAuthenticationProvider" class="org.springframework.security.cas.authentication.CasAuthenticationProvider">
    <property name="userDetailsService" ref="userService" />
    <property name="serviceProperties"  ref="serviceProperties" />
    <property name="ticketValidator">
      <bean class="org.jasig.cas.client.validation.Cas20ServiceTicketValidator">
        <constructor-arg index="0" value="http://localhost:8080/cas" />
      </bean>
    </property>
    <property name="key" value="an_id_for_this_auth_provider_only" />
  </bean>

  <security:user-service id="userService">
    <security:user name="wilson" password="wilson" authorities="ROLE_USER" />
  </security:user-service>

p:cookieSecure="false"