下面是tomcat里面的web.xml配置的信息，能不能帮小弟我解释一下，刚学jsp，多谢！Root和wedav里面的web.xml的片段

<!-- JSPC servlet-->  <servlet>  <servlet-name>org.apache.jsp.index_jsp</servlet-name>  <servlet-class>org.apache.jsp.index_jsp</servlet-class>  </servlet><servlet>  <servlet-name>webdav</servlet-name>  <servlet-class>org.apache.catalina.servlets.WebdavServlet</servlet-class>              <init-param>  <param-name>listings</param-name>  <param-value>true</param-value>  </init-param>     </servlet>  <!-- JSPC servlet mappings -->        <servlet-mapping>  <servlet-name>org.apache.jsp.index_jsp</servlet-name>  <url-pattern>/index.jsp</url-pattern>  </servlet-mapping>     <servlet-mapping>  <servlet-name>webdav</servlet-name>  <url-pattern>/*</url-pattern>  </servlet-mapping>
------解决方案--------------------------------------------------------
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HTML code

<!-- JSPC servlet-->

  <servlet>
  <servlet-name>org.apache.jsp.index_jsp</servlet-name>
  <servlet-class>org.apache.jsp.index_jsp</servlet-class>
  </servlet>
<servlet>
  <servlet-name>……

------解决方案--------------------------------------------------------
  <servlet>
   <description>errorServlet</description>
   <display-name>errorServlet</display-name>
   <servlet-name>errorServlet</servlet-name>
   <servlet-class>com.accp.servlet.errorServlet</servlet-class>
 </servlet>
 <servlet>
   <description>okServlet</description>
   <display-name>okServlet</display-name>
   <servlet-name>okServlet</servlet-name>
   <servlet-class>com.accp.servlet.okServlet</servlet-class>
 </servlet>


 <servlet-mapping>
   <servlet-name>errorServlet</servlet-name>
   <url-pattern>/errorServlet</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
   <servlet-name>okServlet</servlet-name>
   <url-pattern>/okServlet</url-pattern>
 </servlet-mapping>	


 <welcome-file-list>
  

  <welcome-file>index.jsp</welcome-file>