El表达式对照表

 设置  session.getAttribute("date" "date")        

 取得username的值   (String)session.getValue("date")                     ${sessionScope.data}

 

设置application.setAttribute("data", data); 

取application：                                                                      ${applicationScope.data}

 

 

< %=request.getParameter(“username”)% >              ${ param.username }