Struts2使用OGNL访问非值栈对象

非值栈对象访问方式等价访问方式application#application.username
#application['username']application.getAttribute("username")session#session.username
#session['username']session.getAttribute("username")request#request.username
#request['username']request.getAttribute("username");parameters#parameters.username
#parameters['username']request.getParameter("username");attr#attr.username
#attr['username']按pageContext->request->session->application顺序查找