When to use jsp,and when to use servlet?

I think that jsp and servlet can realize the same functions, because when run a jsp, it is transferred to a servlet program, so when to use jsp and when to use servlet?
I am now developing the input interface for a website, I just use jsp and javabean to connect to weblogic and database, and I didn't use servlet, Is there any unseemliness?
Thank you!

IMHO I use servlets to control the flow between my jsp's based on a number of factors in a webapp. For instance, user authorization. If a user has the authorization to conduct various administrative functions on an application (like change user rights, reset passwords etc) they will have access to specific buttons or links on some screens that others will not. I use servlets to establish what access rights a user has and direct them to the appropriate pages. I also use servlets to test data validity on form input screens. I know that I can also do this with JavaScript but that can be disabled by the client and in order to prevent that I also double check the form input from a servlet. All my jsp's do is display the results of a business process (which is held in a JavaBean or EJB) and the servlets act as the controllers for the application, connecting to multiple databases, verifying application state, flow control etc. I try to keep the jsp as simple as possible as some of them are maintained by html developers who lack the necessary experience to write java code. I hope this helps.

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I know that using JSP over servlet has only one advantage like for huge Application you can devide presentation layer from business logic. Is there any other advantage.
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Depends on what you're rying to accomplish. If you want to generate a bunch of HTML then JSP is the way to go. If you just want to extend the server (i.e. add functionality that isn't specific to any one screen of your application), then Servlets are the way to go.
Additionaly, if you have a lot of HTML forms, and want to do it right, check out Struts. This would be the case if you wanted to both extend the server and generate HTML. It's an MVC framework available from Jakarta. It's fairly tried and true at this point. It makes it very easy to maintain, extend, and develop with. It also comes with a wealth of custom tag libraries out of the box. I have developed two projects with it so far and find it a pleasure to work with.
http://jakarta.apache.org/struts/index.html
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When to use jsp,and when to use servlet?

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