Servlet with button onclick event in a Single jsp

How can i write a code to perform a action with the help of servlet in jsp Page?
My problem is that i have an jsp Page and in this jsp Page i have created a button.
I want that On click at this button a servlet start working created into the same page.
For Example:
(Add as Friend) Button on Facebook
That never refresh the page but sends the Request to the user.
Same thing i want to do but with the help of JSP-Servlet....

Removed from a staff-only section.

db

You can use AJAX to create a call to the servlet without refreshing your page.

Re: Servlet with button onclick event in a Single jsp

I think you can use javascript to do it.