"Godbey, David" wrote:
> Craig,
> Thanks for the info. I tried your suggestions, but its just not working. I'm
> using Servlet Exec 2.2, and my applet is running in the JRE 1.2 plugin.
> Every round trip begets a NEW session. The URL rewriting as you outlined
> below is also ignored by the servlet.
I guess I wasn't clear enough ... in order for this to work, you have to use the
same URL rewriting technique that your servlet engine does. The example I
quoted used the Servlet API 2.2 syntax. You need to double check which servlet
API version is being supported by ServletExec -- if it's not Servlet API 2.2 (I
don't know, you'll need to ask them), you need to ask them how they do their
rewriting (or just do some pages with encoding and see for yourself), then copy
that style exactly.
>
> In my research, I've come up with these messages on this topic, addressing
> both the API (cookie) issue and URL rewriting, both of which are reported
> below to not work.
>
> http://forum2.java.sun.com/forum?14@@.ee8f661
> http://forum2.java.sun.com/forum?14@@.ee75c72
>
> Everything works great if I stick to the <APPLET> tag and native JRE. But
> <OBJECT> and <EMBED> give no connectivity between the web page and the
> applet (apparently) with respect to the cookie. So every time the applet
> hits the servlet, whoops, getSession gets a brand new id.
>
I'm by no means an applet guru (native or plugin), but it seems there are two
aspects to making this whole thing work:
* How do you tell the applet what the user's session ID is?
* How does the applet include this session ID on the requests
that it makes itself?
On the first issue, my suggestion was to pass a parameter to the applet, as you
generate the page containing it. This parameter would contain the session ID of
the user's current session, which you acquired with:
HttpSession session = request.getSession();
String sessionId = session.getId();
According to the HTML 4.0.1 spec at least, you can embed parameters inside an
OBJECT element:
<object classid="..." ...>
<param name="sessionid" value="xxxxxxx">
</object>
which should (if my understanding is correct) show up as an applet
initialization parameter on IE. The same approach should work with <applet> for
native-JVM execution. For Netscape's "embed" tag, it looks like you can just
include the session id as another attribute on the <embed> element itself.
For the second issue, you need to make sure that you are encoding things (if
using URL rewriting) or sending a cookie (if using cookies) EXACTLY the way that
your servlet engine does it for regular pages. If you don't the servlet is not
going to be able to tell what session you were requesting, so it gives you a new
one each request. Check the details for your specific engine, for example, for
what cookie name it uses for the session ID.
>
> Are you quite sure about what you've said relative to running applets in a
> PLUGIN, not the native browser JRE? Is there a way to doctor the header of
> an output stream to embed the session id? I see that the HttpServletRequest
> has a method to extract fields from the header. Can I create a cookie in the
> applet and insert it into the output stream? Say by setRequestProperty on
> the URLConnection object?
You can use URLConnection.setRequestProperty() to pass a cookie. The property
name you're setting is "Cookie", and the value must conform to the cookie
specification (RFC 2109). This sets the header in your outgoing request, so
that the servlet engine will see the cookie when it reads the request.
>
> Thanks for your help.
> Dave Godbey
Craig
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