急：display:table export excel问题

[xxy5311]

<display:table name="supportservicereport" sort="list" defaultsort="1" defaultorder="descending" pagesize="20" id="jobList" export="true" style="width: 100%"
</display:table>

我已经在web.xml下加了<filter>啦！
还是不行

         <filter>   
 		<filter-name>exportFilter</filter-name>   
		<filter-class>org.displaytag.filter.ResponseOverrideFilter</filter-class>   
	</filter> 
	
	<filter-mapping>  
        <filter-name>exportFilter</filter-name>  
        <url-pattern>*.do</url-pattern>  
	</filter-mapping>  
	<filter-mapping>  
		<filter-name>exportFilter</filter-name>  
        <url-pattern>*.jsp</url-pattern>  
 	</filter-mapping>

还是报错！！
org.apache.catalina.core.ApplicationDispatcher invoke
严重: Servlet.service() for servlet jsp threw exception
Exception: [.TableTag] Unable to reset response before returning exported data. You are not using an export filter. Be sure that no other jsp tags are used before display:table or refer to the displaytag documentation on how to configure the export filter (requires j2ee 1.3).