如何配置struts2拦截器

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <constant name="struts.devMode" value="true" />
    <constant name="struts.i18n.reload" value="true" />
    <constant name="struts.configuration.xml.reload" value="true" />
    <constant name="struts.i18n.encoding" value="gb2312" />
    <constant name="struts.custom.i18n.resources"
        value="messageResource" />
    <constant name="struts.action.extension" value="jspa" />
    <constant name="struts.multipart.saveDir" value="/tmp" />
    <constant name="struts.multipart.maxSize" value="10000000" />
    <constant name="struts.ui.theme" value="simple" />
    <package name="default" extends="struts-default">
        <interceptors>
            <interceptor name="exceptionInterceptor"
                class="org.roadway.wisp.zd.util.ExceptionInterceptor">
                <param name="interceptorName">
                    self-interceptor
                </param>
            </interceptor>
            <interceptor-stack name="myStack">
                <interceptor-ref name="defaultStack" />
                <interceptor-ref name="exceptionInterceptor" />
            </interceptor-stack>
        </interceptors>
        <default-interceptor-ref name="myStack" />
        <global-exception-mappings>
            <exception-mapping result="error"
                exception="java.lang.Exception" />
        </global-exception-mappings>
    </package>
    <include file="register.xml" />
</struts>