struts 用if标签判断session是否存在

登录时设置session

session.put("user", user);//user为一个bean对象

JSP界面判断session是否为空:

<s:if test="#session.user==null "><a href="adminLogin.jsp" >登录</a>	</s:if>
			<s:if test="#session.user!=null">
				welcome[<a href="javascript:void(0);" onclick="displayUserInfo()">
				<span id="userAccount"><s:property value="#session.user.userAccount" /></span></a>]			
				<a href="javascript:void(0)" onclick="logout()"><img src="../img/logout.png"  width="16px" height="16px" alt="退出" /></a>
			</s:if>