When do you use a JSP and when a Servlet? [duplicate]

Answer 1

There are 2 pretty simple rules:

1. Whenever you want to write Java code (business logic), do it in a Java class (so, Servlet).
2. Whenever you want to write HTML/CSS/JS code (view/template logic), do it in a JSP.

Related question:

• How to avoid Java code in JSP