想玩论坛，结果反被论坛玩我，吐血中...

Question

PageBean pageCtl = pb.listData("1");
if(!session.getAttribute("id")==null)
试试

Answer 1

PageBean pageCtl = pb.listData("1");
if(!session.getAttribute("id")==null)
试试
up

Answer 2

<% if(request.getAttribute("pageCtl").equals(null)){%>看到这行代码，我已经晕了

Answer 3

<%if(!session.getAttribute("id").equals(null)) ----------->
<%if(!session.getAttribute("id")==(null))

Answer 4

<%if(!session.getAttribute("id").equals(null)) ----------->
<%if(!session.getAttribute("id")==null)