Display "guest" on webpage if User is not logged in

Question

I have the working Java code here to display a user's username upon login:

<%= "Welcome " + session.getAttribute("username")%>

If a user is not logged in and at my index.jsp page, it will display "Welcome null". However, I want to display "Welcome Guest" instead.

Is there any way to do this?

Write if/else. If getAttribute("username") null or empty, just print Guest. — kosa, Jul 02 '13 at 18:35

score 1 · Answer 1 · edited May 23 '17 at 12:28

1

Use JSTL tag libraries. JSP scriplets are deprecated almost a decade back.

This is how you do it using JSTL:

Welcome, <c:out value = "${sessionScope.username == null ? 'Guest' : sessionScope.username}" />

See also:

edited May 23 '17 at 12:28

Community

answered Jul 02 '13 at 18:37

Rohit Jain

@user2297666. I've used the conditional operator inside the EL expression. You can learn more about JSTL, in the links attached. – Rohit Jain Jul 02 '13 at 18:41
@user2297666. What are you getting? – Rohit Jain Jul 02 '13 at 18:42
@user2297666. Ah! One little mistake I did. You can try it now. – Rohit Jain Jul 02 '13 at 18:44
Just a Welcome : and that is all – user2297666 Jul 02 '13 at 18:44
@user2297666. It should work now. I forgot the quotes around the "Guest". – Rohit Jain Jul 02 '13 at 18:45

Paul Vargas · Accepted Answer · 2013-07-02T18:47:48.703

1

You can do that with JSTL:

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

Welcome, <c:out value="${sessionScope.username}" default="guest" />

edited Jul 02 '13 at 18:47

answered Jul 02 '13 at 18:41

Paul Vargas

2 Answers2