Hi:
I hope someone has come up with an elegant method that solves my
problem, and is willing to share.
My application is based on the Chapter 6 sample in Wrox "Professional
JSP 2nd Ed."):
1. Controller looks up and calls an event handler's process() method.
2. The event handler populates one or more beans using JDBC/mySQL and
stuffs them in session/request as required.
3. Controller forwards to jsp, which uses beans to display stuff in a
form.
Fine so far. Now, the user can update the form fields and click an
"Update" button, which starts the above steps going again.
If the event handler now finds an error in the user's input, it creates
an error bean and the controller forwards to the jsp again. I want the
jsp to display the erroneous input as well as the error messages.
However, the bean that the jsp is reading from has data types that may
not accept the user's input. For example, the user might put 15.q0
(after all, the 'q' is really close to the 'one' key) in a form field
that is defined as a double in the bean.
I thought, OK, just make the bean properties Strings, and I won't have
to worry about it. The problem with this is that then I will have to do
data type conversions whenever I want to use the bean to actually do
some processing (for example, add the double value to something, do some
date manipulation, etc.), which makes things, well, ugly.
I suppose I could keep one bean with nothing but String properties
(string bean?) for display, and another with correct data types, but
that's ugly, too, unless there's a nice way to accomplish this that I
haven't thought of.
I really don't want to have two jsp's displaying the same info, or add
conditions to the jsp causing it to read from the bean or the request
depending on the situation.
Now that you've waded through all that, any suggestions?
--
Quinn Stone
Stone Consultants
2214 1/2 Santa Clara Ave.
Alameda, CA 94501
510.865.7342
www.stoneconsultants.com
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