ExternalAuth confusing

[Peter Schober]

* dominic <apchee.chen at gmail.com> [2013-04-03 11:49]:
> 1.       How does resource.jsp retrieve the parameter email supplied by
> user on the login.jsp?
> 
> Could you please give me some guidance or learning material?

Try
https://wiki.shibboleth.net/confluence/display/SHIB2/UnderstandingShibboleth
(linked from the start page of the official documentation) for how the
information get's from the SAML IdP (login.jsp is irrelevant) to the
SAML SP (/secure/resource.jsp in your case, but could by anything).

Regarding accessing that info from within your JSP page, see
https://wiki.shibboleth.net/confluence/display/SHIB2/NativeSPAttributeAccess
-peter