最近專案整合CAS單點登入後，又出現了亂碼問題。修改Tomcat編碼，不起作用；WEB.XML配置字符集過濾filter不起作用，想來想去，問題可能出現在CAS上。

經過測試，原來是字元過濾filter配置在了CAS的下面。 修改為如下即可：

<!-- 設定字符集應在CAS前面，否則可能會引起後面的亂碼問題 -->
<filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<!-- 單點登入  -->
<!--該過濾器用於實現單點登出功能，可選配置。 -->
<filter>
    <filter-name>CASSingle Sign OutFilter</filter-name>
    <filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
    <init-param>
        <param-name>casServerUrlPrefix</param-name>
        <param-value>https://dev.com/cas</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>CASSingle Sign OutFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
<!--用於單點退出，該過濾器用於實現單點登出功能，可選配置 -->
<listener>
    <listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
</listener>

<filter>
    <filter-name>CAS Authentication Filter</filter-name>
    <filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
    <init-param>
        <param-name>casServerLoginUrl</param-name>
        <param-value>https://dev.com/cas/login</param-value>
    </init-param>
    <init-param>
        <param-name>serverName</param-name>
        <param-value>https://dev.com/tweb</param-value>
    </init-param>
</filter>

<filter>
    <filter-name>CAS Validation Filter</filter-name>
    <filter-class>org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter</filter-class>
    <init-param>
        <param-name>casServerUrlPrefix</param-name>
        <param-value>https://dev.com/cas</param-value>
    </init-param>
    <init-param>
        <param-name>serverName</param-name>
        <param-value>https://dev.com</param-value>
    </init-param>
</filter>

<filter>
    <filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
    <filter-class>org.jasig.cas.client.util.HttpServletRequestWrapperFilter</filter-class>
</filter>

<filter-mapping>
    <filter-name>CAS Validation Filter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<filter-mapping>
    <filter-name>CAS Authentication Filter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<filter-mapping>
    <filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>