Struts2 Unterminated <s:iterator tag

这是一个显示页，显示最终的分页效果。使用Struts2标签时，报错：Unterminated <s:iterator tag

 <%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="GB18030"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!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=GB18030">
<title>Struts2 实现分页</title>
</head>
<body>
    <div  align="center">           
        <table  border="1">                   
            <tr>                          
                <th>学号</th>          
                <th>姓名</th>          
                <th>地址</th>          
                <th>电话</th>       
            </tr>                  
            <s:iterator  value="students">  
                 <tr>                                 
                    <td><s:property  value="id" /></td>             
                    <td><s:property  value="stuName" /></td>             
                    <td><s:property  value="address" /></td>             
                    <td><s:property  value="stuPhone" /></td>          
                </tr>  
            </s:iterator>                
        </table>                
    <s:url  id="url_pre"  value="show.action">  
         <s:param  name="pageNow"  value="pageNow-1"></s:param>  
     </s:url>
                   
    <s:url  id="url_next"  value="show.action">  
         <s:param  name="pageNow"  value="pageNow+1"></s:param>  
     </s:url>                   
        <s:a  href="%{url_pre}">上一页</s:a>
                        
    <s:iterator  value="students"  status="status">  
        <s:url  id="url"  value="show.action">  
            <s:param  name="pageNow"  value="pageNow" />  
        </s:url>  
     </s:iterator>                
        <s:a  href="%{url_next}">下一页</s:a>             
    </div>
</body>
</html>

http://www.codeweblog.com/stag/unterminated-s-iterator-tag/

应该是没有导入相关的jar包吧

Struts2 Unterminated &lt;s:iterator tag

Struts2 Unterminated <s:iterator tag