一个Struts问题，请各位仁兄帮忙！！！！

下面是我做的相关程序!!在程序中的struts-config.xml
<struts-config>
    <form-beans>
        <form-bean name="userForm" type="test.UserForm"/>
    </form-beans>
    <global-forwards>
        <forward name="failed"  path="/failed.do"/>
        <forward name="regist" path="/regist.jsp"/>
    </global-forwards>
    <action-mappings>
        <action path="/regist" type="test.RegistAction" name="userForm" scope="request"
        input="/index.jsp"/>
        <action path ="/overview" forward="/hello.jsp"/>
        <action path ="/failed" forward="wpsing.jsp"/>
    </action-mappings>
</struts-config>下面是web.xml
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <servlet>
        <servlet-name>action</servlet-name>
        <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>/WEB-INF/struts-config.xml</param-value>
        </init-param>
        <init-param>
            <param-name>debug</param-name>
            <param-value>2</param-value>
        </init-param>
        <init-param>
            <param-name>detail</param-name>
            <param-value>2</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
        </servlet>
    <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    <session-config><session-timeout>
            30
        </session-timeout></session-config><welcome-file-list><welcome-file>
            index.jsp
        </welcome-file></welcome-file-list></web-app>
下面是一个ActionForm
package test;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionMapping;/**
 *
 * @author Administrator
 */
public class UserForm extends ActionForm{
  private  User user=new User();
  public void setName(String s){
    this.user.setName(s);}
  public String getName()
  {
      return this.user.getName();}
  public void setPs(String s) 
  {
      this.user.setPs(s);} 
  public String getPs()
  {
      return this.user.getPs();}
  public void setUser(User user)
  {
      this.user=user;
  }
  public User getUser(){
  return this.user;}
  
}
下面是一个Action
package test;
import java.lang.reflect.InvocationTargetException;
import java.util.Locale;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.util.MessageResources;
import test.UserForm;public final class RegistAction extends Action{
    public ActionForward execute(ActionMapping mapping,ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response)
            throws Exception {
        Locale locale = getLocale(request);
        MessageResources messages=getResources(request);
        HttpSession session = request.getSession();
        UserForm userform =(UserForm) form;
        User user=userform.getUser();
        request.setAttribute("user",user);
        if ("lpw".equals(userform.getName()))
            return (mapping.findForward("failed"));
        else
            return (mapping.findForward("regist"));
    }
    
}
还有几个jsp页面程序hello.jsp,index.jsp,regist.jsp,wpsing.jsp
如下：hello.jsp
<%@page contentType="text/html" language="java"%>
<%@page pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>hello Page</title>
    </head>
    <body>
    <h1>site map</h1>
    The following is content filling by reader  
    </body>
</html>
index.jsp程序:
<%@page contentType="text/html" language="java"%>
<%@page import="test.*"%>
<%@page pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>index Page</title>
    </head>
    <body>
    <h1>index Page</h1>
    <br/>
    <a href="./overview.do">站点导航</a>
    <form action="regist.do" method="post">
        用户:<input type="text" name="name"><br>
        密码:<input type="password" name="ps"><br>
             <input type=submit value="新增用户">
    </form>
    </body>
</html>
regist.jsp程序
<%@page contentType="text/html" language="java" %>
<%@page pageEncoding="UTF-8"%>
<jsp:useBean id="userform" class="test.UserForm" scope="session"/><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd"><html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>regist Page</title>
    </head>
    <body>    <h1>regist Page</h1>
   
       新用户帐号：<%=userform.getName()%><br>
       密码：<%=userform.getPs()%> 
    
    </body>
</html>wpsing.jsp程序：
<%@page contentType="text/html" language="java"%>
<%@page pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>wpsing page</title>
    </head>
    <body>
     <h1>wpsing  Page</h1>
<jsp:useBean id="beanlpw" class="test.UserForm" scope="session"/>
   现有用户：<%=beanlpw.getName()%><br>
      密码：<%=beanlpw.getPs()%><br>
    </body>
</html>
我要想得到的结果是通过表单，改变name与ps的值！！但是值总是null，不知道那里错了，请高手指教!!!