<jsp:forward page="portal" />这里的portal对应哪里？

tomcat root下 有个index.jsp 里边就一句 <jsp:forward page="portal" />

问下 portal是个servlet-mapping么。对应哪里的？
我在ROOT\WEB-INF的web.xml里看到了这个 但不知道是不是。另外问下为什么要把好几个url-pattern对应的name都叫jetspeed?  /portal/* 这么写又代表什么啊
 <servlet-mapping>
       <servlet-name>
          jetspeed
       </servlet-name>
       <url-pattern>
         /portal/*
       </url-pattern>
  </servlet-mapping>

web.xml内容如下：
<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
Copyright 2004 The Apache Software Foundation

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!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>
  <display-name>Jetspeed-2 Enterprise Portal</display-name>
  <!-- Log4JConfigurator context-listener parameters -->    
  <context-param>
    <param-name>log4j.config.file</param-name>
    <param-value>/WEB-INF/conf/Log4j.properties</param-value>
  </context-param>
  <context-param>
    <param-name>log4j.config.webApplicationRoot.key</param-name>
    <param-value>applicationRoot</param-value>
  </context-param>
  <listener>
      <listener-class>org.apache.jetspeed.webapp.logging.Log4JConfigurator</listener-class>
    </listener>
  
  <servlet>
    <servlet-name>jetspeed</servlet-name>
    <servlet-class>org.apache.jetspeed.engine.JetspeedServlet</servlet-class>
    <init-param>
      <param-name>properties</param-name>
      <param-value>/WEB-INF/conf/jetspeed.properties</param-value>
    </init-param>
    <init-param>
      <param-name>applicationRoot</param-name>
      <param-value>webContext</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>

   <!-- Define Velocity template compiler -->
<servlet>
<servlet-name>velocity</servlet-name>
<servlet-class>org.apache.jetspeed.velocity.JetspeedVelocityViewServlet</servlet-class>
<init-param>
<param-name>org.apache.velocity.toolbox</param-name>
<param-value>/WEB-INF/toolbox.xml</param-value>
</init-param>
<init-param>
<param-name>org.apache.velocity.properties</param-name>
<param-value>/WEB-INF/velocity.properties</param-value>
</init-param>
<init-param>
<param-name>org.apache.jetspeed.cache.size</param-name>
<param-value>50</param-value>
</init-param>
<init-param>
<param-name>org.apache.jetspeed.cache.validation.interval</param-name>
<param-value>10000</param-value>
</init-param>
<load-on-startup>10</load-on-startup>
</servlet>

  <servlet>
    <servlet-name>LogoutServlet</servlet-name>
    <servlet-class>org.apache.jetspeed.login.LogoutServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>ManagerServlet</servlet-name>
    <servlet-class>org.apache.jetspeed.manager.ManagerServlet</servlet-class>
  </servlet>

    <servlet>
     <servlet-name>LightweightLoginServlet</servlet-name>
     <servlet-class>com.seeyon.v3x.login.LightweightLoginServlet</servlet-class>
     <init-param>
     <param-name>LoginAuthenticationFile</param-name>
     <param-value>/WEB-INF/conf/loginAuthentication.properties</param-value>
     </init-param>
    </servlet>
    <servlet>
     <servlet-name>verifyCodeImage</servlet-name>
     <servlet-class>org.apache.jetspeed.login.VerifyCodeImageServlet</servlet-class>
    </servlet>
    <servlet>
     <servlet-name>SSOLoginServlet</servlet-name>
     <servlet-class>org.apache.jetspeed.login.SSOLoginServlet</servlet-class>
    </servlet>
 <servlet>
     <servlet-name>SSOEquityLoginServlet</servlet-name>
     <servlet-class>org.apache.jetspeed.login.SSOEquityLoginServlet</servlet-class>
    </servlet>
    <servlet>
     <servlet-name>SSOLogoutServlet</servlet-name>
     <servlet-class>org.apache.jetspeed.login.SSOLogoutServlet</servlet-class>
    </servlet>
    <servlet>
     <servlet-name>ncremotereg</servlet-name>
     <servlet-class>com.seeyon.sso.servlet.RemoteRegistServlet</servlet-class>
    </servlet>

  <servlet-mapping>
       <servlet-name>
          jetspeed
       </servlet-name>
       <url-pattern>
         /portal/*
       </url-pattern>
  </servlet-mapping>
    <servlet-mapping>
       <servlet-name>
          jetspeed
       </servlet-name>
       <url-pattern>
         /portlet/*
       </url-pattern>
    </servlet-mapping>            
    <servlet-mapping>
       <servlet-name>
          jetspeed
       </servlet-name>
       <url-pattern>
         /jetspeed/*
       </url-pattern>
    </servlet-mapping>
    <servlet-mapping>
       <servlet-name>
          jetspeed
       </servlet-name>
       <url-pattern>
         /fileserver/*
       </url-pattern>
    </servlet-mapping>            
    <servlet-mapping>
       <servlet-name>
          jetspeed
       </servlet-name>
       <url-pattern>
         /ajaxapi/*
       </url-pattern>
    </servlet-mapping>            
    
    <!-- Map *.vm files to Velocity  -->
<servlet-mapping>
<servlet-name>velocity</servlet-name>
<url-pattern>*.vm</url-pattern>
</servlet-mapping>

    <servlet-mapping>
        <servlet-name>LogoutServlet</servlet-name>
        <url-pattern>/login/logout</url-pattern>
    </servlet-mapping>

    <servlet-mapping>
        <servlet-name>ManagerServlet</servlet-name>
        <url-pattern>/manager/*</url-pattern>
    </servlet-mapping>
    
    
 <servlet-mapping>
  <servlet-name>LightweightLoginServlet</servlet-name>
  <url-pattern>/login/proxy</url-pattern>
  </servlet-mapping>
 <servlet-mapping>
  <servlet-name>verifyCodeImage</servlet-name>
  <url-pattern>/verifyCodeImage.jpg</url-pattern>
  </servlet-mapping>
 <servlet-mapping>
  <servlet-name>SSOLoginServlet</servlet-name>
  <url-pattern>/login/sso</url-pattern>
  </servlet-mapping>

     <servlet-mapping>
  <servlet-name>SSOEquityLoginServlet</servlet-name>
  <url-pattern>/login/ssoEquity</url-pattern>
  </servlet-mapping>

 <servlet-mapping>
  <servlet-name>SSOLogoutServlet</servlet-name>
  <url-pattern>/login/ssologout</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
  <servlet-name>ncremotereg</servlet-name>
  <url-pattern>/remotereg</url-pattern>
  </servlet-mapping>
 
  <!-- The Usual Welcome File List -->
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
   
  <error-page>
<error-code>404</error-code>
<location>/error.htm</location>
</error-page>
<error-page>
<error-code>403</error-code>
<location>/error.htm</location>
</error-page>

  <!-- JNDI Db resource -->
   <resource-ref>
      <description>DB Connection</description>
      <res-ref-name>jdbc/A8</res-ref-name>
      <res-type>javax.sql.DataSource</res-type>
      <res-auth>Container</res-auth>
  </resource-ref>

</web-app>
--------------------编程问答-------------------- 是个servlet，在.jar包里 --------------------编程问答-------------------- jar包里？ 我发得web.xml里有么 能知道最终调用的是哪个类么 --------------------编程问答-------------------- 会交给这个servlet处理:org.apache.jetspeed.engine.JetspeedServlet

  <servlet>
    <servlet-name>jetspeed</servlet-name>
    <servlet-class>org.apache.jetspeed.engine.JetspeedServlet</servlet-class>
    <init-param>
      <param-name>properties</param-name>
      <param-value>/WEB-INF/conf/jetspeed.properties</param-value>
    </init-param>
    <init-param>
      <param-name>applicationRoot</param-name>
      <param-value>webContext</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
--------------------编程问答-------------------- <servlet>
    <servlet-name>jetspeed</servlet-name>
    <servlet-class>org.apache.jetspeed.engine.JetspeedServlet</servlet-class>
....

这个是servlet的声明


 <servlet-mapping>
       <servlet-name>
          jetspeed
       </servlet-name>
       <url-pattern>
         /portal/*
       </url-pattern>
  </servlet-mapping>

这个是映射关系，将所有提交给portal的请求都对应到jetspeed这个servlet上。 --------------------编程问答-------------------- org.apache.jetspeed.engine.JetspeedServlet

补充：Java ,  Java EE