JAVA中动态生成标签中的name

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Action代码：

package com.DongTai;

import java.util.ArrayList;
import java.util.List;

import com.login.UserInformation;
import com.opensymphony.xwork2.Action;

public class DongTaiAction implements Action {

UserInformation user0 = new UserInformation();
UserInformation user1 = new UserInformation();

public UserInformation getUser1() {
return user1;
}

public void setUser1(UserInformation user1) {
this.user1 = user1;
}

public UserInformation getUser0() {
return user0;
}

public void setUser0(UserInformation user2) {
this.user0 = user2;
}

List<UserInformation> userlist = new ArrayList<UserInformation>();

public List<UserInformation> getUserlist() {
return userlist;
}

public void setUserlist(List<UserInformation> userlist) {
this.userlist = userlist;
}

public String execute() throws Exception {
  UserInformation model1 = new UserInformation();
  UserInformation model2 = new UserInformation();
  model1.setUserName("张三");
  model1.setUserAddress("山东烟台");
  model2.setUserName("李四");
  model2.setUserAddress("江西南昌");
  userlist.add(model1);
  userlist.add(model2);
  return "default";
}
public String GetValue(){
  userlist.add(user0);
  userlist.add(user1);
  return "default";
}

}

JSP 页面代码：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

    <title>My JSP 'MyJsp.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<form action="DongTai!GetValue" method="post">


       <s:iterator value="userlist" id="model" status="status">
   <s:property value="%{'user'+(#status.index==0?1:#status.index+1)+'.UserName'}"/>
   <br/>
   <s:textfield name="%{'user'+#status.index+'.UserName'}" value=""/>
   <s:property value="%{#status.index}"/>
   <s:property value="%{#model.UserName}"/>
   <br/>
   </s:iterator>
   <input type="submit" value="提交"/>
   </form>
</body>
</html>