cas sso 客户端（client） web.xml配置（亲测成功）

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd "
         version="2.5">

  <display-name>Archetype Created Web Application</display-name>
  <filter>
    <filter-name>casAuthenticationFilter</filter-name>
    <filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
    <init-param>
      <param-name>casServerLoginUrl</param-name>
      <param-value>http://localhost:9100/cas/login</param-value>
    </init-param>
    <init-param>
      <param-name>serverName</param-name>
      <param-value>http://localhost:9001</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>casAuthenticationFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <filter>
    <filter-name>casTicketValidationFilter</filter-name>
    <filter-class>org.jasig.cas.client.validation.Cas10TicketValidationFilter</filter-class>
    <init-param>
      <param-name>casServerUrlPrefix</param-name>
      <param-value>http://localhost:9100/cas</param-value>
    </init-param>
    <init-param>
      <param-name>serverName</param-name>
      <param-value>http://localhost:9001</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>casTicketValidationFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <filter>
    <filter-name>casHttpServletRequestWrapperFilter</filter-name>
    <filter-class>org.jasig.cas.client.util.HttpServletRequestWrapperFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>casHttpServletRequestWrapperFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <filter>
    <filter-name>casAssertionThreadLocalFilter</filter-name>
    <filter-class>org.jasig.cas.client.util.AssertionThreadLocalFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>casAssertionThreadLocalFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!-- CAS: 用于单点退出 -->
  <listener>
    <listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
  </listener>

  <!-- CAS 单点登录(SSO) 过滤器配置 (end) -->
</web-app>