struts2框架的标签问题为什么#request.a在没有打印出aaa

 <body>
   <%
     request.setAttribute("a","aaa");
   %>
    <s:form>
        <s:textfield value="#request.a" label="getText('country')"></s:textfield>
        <s:textfield value="%{#request.a}" label="%{getText('country')}" ></s:textfield>
    </s:form>
  </body>

http://techpool.iteye.com/blog/701237

直接value="#request.a". 可以吗？不然用el