Cookies in Servlets and redirecting Servlet results to a JSP. 2006-11-23 - By Robbert
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Hello,
After receiving some excellent help on my other topic, I thought I'd try
here again. This problem is related to the application I am making in my
other thread, but you needn't know the specifics. I'll just give you the
necessary information.
The webapp has to register hits and those have to be shown on a page named
Statistieken.jsp (which is located in /pages). This works.
My setup is as follows: The user visits /Statistieken (via the link going to
/Statistieken), then StatistiekServlet gathers the necessary data (HTTP
headers, URIs, etc.), stores it in a MySQL database (a rather simple and not
normalised one...) and is done. In web.xml I have /Statistieken mapped to
the StatistiekServlet.
Apparently, I have to track when a specific user last visited the page. And
I have to do that with cookies (yes, cookies...).
So my idea is as follows: a class, CookieServlet, uses getCookies() to
return a cookie array. If it's empty, there are no cookies set and a cookie
with the current number of hits for the statistics page will be set and the
statistics page will be shown.
If it's not, I iterate through it until I find the cookie I want. The value
in there (which is always a number to make things easier for me...) is
placed in an int with String.valueOf().
Then I use some basic SQL to determine the current number of hits, substract
the value in the cookie from the current number of hits to determine how
many visitors there have been since that person's last visit.
My questions are as follows:
- How can I get Statistieken.jsp to get the result of the subtraction
without using too much Java code in my JSP document? I'm thinking of making
an instance of the CookieServlet class and then calling the method that
returns the result of the subtraction and placing that in the JSP with a
scriptlet. Is this possible? And if so, is this the proper way for an MVC
structure?
- Given a Servlet that gets the records from the database, how do I get the
results in the ResultSet in the Servlet to the JSP and how do I iterate
through them without coding too much logic in the JSP? Do I use tags or is
there some easier method?
Thanks for your help and if you need clarification: Ask away!
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-redirecting-Servlet-results-to-a-JSP.-tf2692424.html#a7507983
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