EL表达式从request和session中取值

在Action中保存登录的基本信息：request.getSession().setAttribute("adminid", str);

在JSP页面中：${sessionScope.adminid}

java:request.setAttribute("adminid",str);

在JSP页面中：${#request.adminid}

Struts2中 :<s:hidden name="adminid" value="#session.adminid"></s:hidden>

或者 <s:hidden value="%{#session.adminid}" name="adminid" id="adminid"></s:hidden>