struts2------struts的iterator遍历标签

public class VauleStack extends ActionSupport {

    public List<User> aa=new ArrayList<User>();

    public List<User> getAa() {
        return aa;
    }

    public String debugMethod()
    {
        aa.add(new User(  "28", "广州"));
        aa.add(new User( "18", "潮汕"));
        aa.add(new User( "38", "韶关"));
        aa.add(new User(  "98", "湖南"));
        aa.add(new User(  "48", "河源"));
        aa.add(new User(  "8", "湖北"));

   return SUCCESS;
    }
}

jsp:

<body>
  <table border="1">
      <tr>
          <td>序号</td>
          <td>年龄</td>
          <td>城市</td>
      </tr>
<s:iterator value="aa" var="stu" status="st">
    <tr>
        <td>${st.count}</td>
    <td> <s:property value="#stu.username"></s:property>----${stu.username} </td>
    <td> <s:property value="#stu.password"></s:property>-----${stu.password} </td>
    </tr>
</s:iterator>
</table>
<s:debug></s:debug>

  </body>