Servlet Chaining

Servlet Chaining means the output of one servlet given as a input to another servlet. Servlet Aliasing allows us to invoke more than one servlet in sequence when the URL is opened with a common servlet alias. The output from first Servlet is sent as input to other Servlet and so on. The Output from the last Servlet is sent back to the browser. The entire process is called Servlet Chaining.

How to do Servlet Chaining in Servlet Programming?

Using include
RequestDispatcher rd = req.getRequestDispatcher("SecondServlet"); 
rd.include(request, response);

Using forward
RequestDispatcher rd = req.getRequestDispatcher("SecondServlet"); 
rd.forward(request, response);