SunOne中如何设置servlet目录?

[jcfox]

web.xml如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<filter>
<filter-name>CheckSessionFilter</filter-name>
<filter-class>hs.web.common.filter.CheckSessionFilter</filter-class>
<init-param>
<param-name>loginPage</param-name>
<param-value>/index.do</param-value>
</init-param>
<init-param>
<param-name>ignoreURL</param-name>
<param-value>.jsp,mobileBind,messageSend,mobileBindVerify,mobileUnBind,mobileGetPassword,gotoYellowPage.do,homepageLogin.do,homepageLogout.do,rightCheck.do, tradeInfoIndex.do,searchStore.do,tradeInfoInsert.do,tradeInfoQuery.do,tradeInfoShowDetail.do, enterpriserList.do,enterpriserDetail.do, analysisSumList.do, analysisSubList.do,analysisDetail.do,proddetail.do,marketintro.do, marketintrolist.do,marketintroshows.do,prodtypelist.do,help.do, helpleaveworld.do, helptitle.do,rent.do,rentdetail.do,rentadd.do, rentlink.do,rentlist.do,highSearch.do,index.do,searchEnterprise.do,searchProductPic.do,searchProduct.do,search.do,searchStore.do,searchRentEtc.do,leaveWordGen.do,leaveWordAction.do,memberRegister.do,myrentinfo.do,updaterent.do,myrentedit.do,stallRentLeaveword.do,rentbbslist.do,rentbbsdetail.do,showRentLeaveword.do,backmobilepwd.do,smsexplain.do,smssubscibe.do</param-value>
</init-param>
</filter>
<filter>
<filter-name>EncodingFilter</filter-name>
<filter-class>hs.web.common.filter.EncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>gb2312</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CheckSessionFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CheckSessionFilter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>EncodingFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>EncodingFilter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>application</param-name>
<param-value>hs/web/config/ApplicationResources</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet>
<servlet-name>getImg</servlet-name>
<servlet-class>hs.web.servlet.getImg</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>getImg</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>60</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>/homepage/chn/mainpage/default.jsp</welcome-file>
</welcome-file-list>
<taglib>
<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-nested.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-template.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-template.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-tiles.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
</taglib>
<resource-ref>
<description>ywdata DataSource</description>
<res-ref-name>jdbc/ywebiz</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>

为何执行getImg时报错？请大侠们帮忙