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

Answer 1

i think its up to you? because JSP is Java inside of HTML and Servlet is a Java that can do the HTML inside

hmmm... servlet is more sercure than jsp because if you submit to Servlet and forward to another JSP there is no file extension appear and also you cant see what Page it is..

but the advantage of JSP is you can code there easily.