JSP and Servlets - when to use which?

Greetings,
I am a software developer with a very good understanding of Java. I build web applications, console applications, server/client apps, gui apps, what have you.. Web development with Java seems so dynamic now, that I can't seem to keep up with it. I have a simple style of developing web apps with java. Basically I create Java DTO(Data Transfer Object) classes that will perform in the backend and talk to a database using JDBC, or write to file, or read from file, what have you. I develop JSP pages that produce the proper HTML based on what a user wants to see. I may create some functionality in the DTOs that will pass along certain data. Sometimes the JSP can get a little sloppy due to the nature of the app. I create forms that collect information using JSP/HTML and I create JSP pages that will extract the form data from the form page and then send that data to the DTOs for further processing. I am not creating any classes that implement or extend HttpServlet and this is starting to bother me. Is this more the accepted way of developing Java Web Apps? What could you consider these DTOs I am creating? Can these be considered servlets? I compile the classes and use them as if they were a servlet, but they really aren't right? I am not sure and I need to catch up with what's going on in the real world. This is the unfortunate part of never having anyone to mentor you. I feel like I am falling behind. What about the newer technologies emerging - Struts, Tiles, JSF, what have you.. Could these possibly be replacing the functionality of Servlets? Thanks for listening...
takizzle

There's no reason to slam anyone that's asking advice on a HELP FORUM.
anyway, that aside-
I usually use JSPs for presentation and show database views with them. take for example a shopping basket application, you would have a custom tag that would loop through the contents of the customer's shopping cart and display them.
however when the customer was filling out thier information the form would point at a servlet that would handle the logic and processing.
that's the diff- user servlets to handle logic and JSPs to handle presentation.
cheers, and good luck :)

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