Best way to retrieve data for jsp

Hi,
I'm fairly new to java and am preparing to create some jsp's for our intranet. The pages need to include data from a db2 database. I know pretty much what I need to do, but I'm trying to decide the best(most efficient) way to retrieve the data to display. I've looked at a number of examples and the more I look, the more confused I get (it would be so easy on the AS400 which is my background so you can see how new this is to me). I see my options as: using an 'include' statement to include another java file that retrieves the data; or use a java bean; or just instantiate an instance of the class and 'call' the methods for that class directly; or lastly, place all the code directly in the jsp to connect to the database and query the table.
What's the real difference between these options and what's usually the most efficient and preferred way?
Thanks for any advice and clarification.

As a general rule, it's a good idea to separate the
presentation (JSP and HTML) from the business rules
(database access). I know you didn't do that on the
AS/400, you had display files and business logic in
the same program (at least, we certainly do in ours),
but it's a good policy to follow in the web world.
That means, don't put your database access code in
the JSP. Other than that, it depends on the data.
If you have simple data (e.g. customer's name and
d address) then a Java bean would suffice. If you
have complex data (e.g. customer's payment history)
then a bean still might suffice. You would use an
"include" if you had some data (static or dynamic)
that you wanted to appear in several different pages
in the same form.Thanks, I figured putting the code in the JSP was not the best way, but I wasn't sure about the other options.

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