Struts 解决中文乱码的问题

Struts.xml配置文件如下：

<struts>
??? <constant name="struts.devMode" value="true" />
??? <constant name="struts.i18n.encoding" value="GBK" /> <!-- internationalization -->
??? <package name="user" extends="struts-default" namespace="/user">
??????? <action name="userAdd" method="add">
??????????? <result>/user_add_success.jsp</result>
??????? </action>
???????
??????? <action name="user" class="com.bjsxt.struts2.user.action.UserAction">
??????????? <result>/user_add_success.jsp</result>
??????? </action>
??? </package>
</struts>

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Web.xml 文件如下：

?<filter>
??????? <filter-name>struts2</filter-name>
??????? <!--<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>-->
????? <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
??? </filter>

??? <filter-mapping>
??????? <filter-name>struts2</filter-name>
??????? <url-pattern>/*</url-pattern>
??? </filter-mapping>