SunOne中如何设置servlet目录?

Question

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,etintro.do, etintrolist.do,etintroshows.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