EL表达式和OGNL表达式的区别

1 用法区别

OGNL通常要结合struts2标签一起使用,如<s:property value="#xx" />, 不能单独使用. 

EL表达式可以单独使用${sessionScope.userName}

2 页面取值区别

名称ServletOGNLELparametersrequest.getParameter("userName")#userName${userName}requestrequest.getParameter("userName")#request.userName${requestScope.userName}sessionsession.getParameter("userName")#session.userName${sessionScope.userName}applicationapplication.getParameter("userName")#application.userName${applicationScope.userName}attr #attr.userName