Dear GWT Users,
Many thanks in advance for any help and advice. Very much appreciated!
I have a legacy application: java Swing client with XML based Servlet
communication (request and response).
The server comprised of aro
und 10 Servlets, one 'Front Controller' that forwarded (RequestDispatcher
) to other Servlets depending on the initial XML request from client.
These delegated Servlets did everything (parsed XML, db queries, session
data, etc).
I decided move java swing client to gwt. Also move from XML to gwt rpc.
Ideally I dont want to rewrite the whole server again (even thought it just
talks in XML / Strings).
I thought I could just forward my request from my main RemoteServiceServlet
class, on to my 'legacy' XML servlets.
What do I have so far?
A working GWT client, making RPC calls to my RemoteServiceServlet.
Successfully set session data and forward on to a e.g. LoginServlet.
LoginServlet queries db and updates session data.
Read updated session data in RemoteServiceServlet.
For example:
*RemoteServiceServlet*
getThreadLocalRequest().getSession().setAttribute("username", username);
requestDispatcher =
getThreadLocalRequest().getRequestDispatcher("/LoginServlet");
requestDispatcher.forward(getThreadLocalRequest(), getThreadLocalResponse());
*LoginServlet*
String username = (String) session.getAttribute("username");
// do some db stuff & set new session data
session.setAttribute("userEmail", userEmail);
*RemoteServiceServlet*
getThreadLocalRequest().getSession().getAttribute("userEmail")
This seems very convoluted and hacky, and not scalable for the amount of
work done in my 'legacy' servlets. Is there a better way?
Can I have multiple servlets extend RemoteServiceServlet?
Whats the best way to implement a 'front controller' style architecture
with gwt?
Whats the best way to integrated multiple legacy XML servlets with a GWT
facade / front controller?
My legacy servlets just read and write a lot of XML, for example
<MFRequest>
<Request type='SaveSettings' data=''/>
<UserPrefs download_pref='../' email_pref='yes' decompress_pref='no'
password_pref='no'/>
</MFRequest>
This thread was helpful
https://groups.google.com/forum/#!topic/google-web-toolkit/kRmrirPsFC8
I have a lot of XML data, session data and file upload / download data
(hence have these split up in to different servlets).
Anyway- hope this gives an overall picture of my project / problem(s).
Regards, Sam
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