> Tell me do you use Cookie's or Hidden forms or URL rewriting for maintain
> sessions??
>
> I ask this question to help solve a problem of my own!
>
> Vinod
The basic way to do this is given below. (Please don't send me follow-up
questions
on the details. If this doesn't make sense, I suggest you get a basic book
on
servlets and review session handling)
1) All pages in your application have to have something like this at the
top:
<%
if ( session.isNew() )
{
response.sendRedirect( response.encodeRedirectUrl(
"/login.jsp" ) );
return;
}
if ( null == session.getValue( "username" ) )
{
response.sendRedirect( response.encodeRedirectUrl(
"/login.jsp" ) );
return;
}
%>
If the session object has just be created, or if there is not a valid
username stored
in the session, they will be re-directed to the login page.
2) Your "login.jsp" has to present a form that gets username, password, etc.
Also,
check the session object for an error-message, eg:
<%
String emsg;
emsg = session.getValue( "errormessage" );
if ( null != emsg )
{
out.println( "<br><b>" + emsg + "</b><br>" );
}
%>
3) Make the <FORM> action in login.jsp something like "checklogin.jsp".
In checklogin.jsp, do the following:
<%
boolean loginOk = false;
String username = null;
// put your own code to check the POSTed username, password
if ( loginOk )
{
session.putValue( "username", username );
response.sendRedirect( response.encodeRedirectUrl(
"/memberpage.jsp" ) );
return;
}
else
{
session.putValue( "errormessage", "Username/password is
invalid." );
response.sendRedirect( response.encodeRedirectUrl(
"/login.jsp" ) );
}
%>
That's all there is to it -- the servlet/JSP engine will (or should) handle
all the
mechanics of re-writing Urls to include session identifiers if needed. If
you want to use
hidden fields, you need to write your own code to create, save and access
sessions.
- Fernando
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