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Explanation

RequestDispatcher allows a servlet to transfer a request to another resource such as another servlet, JSP, or HTML page.

Code:

RequestDispatcher dispatcher =
    request.getRequestDispatcher("home.jsp");

Explanation

forward() transfers request processing to another resource. The browser URL normally remains unchanged.

Code:

RequestDispatcher dispatcher =
    request.getRequestDispatcher("home.jsp");

dispatcher.forward(request, response);

Explanation

include() includes the output of another resource in the current response.

Code:

RequestDispatcher dispatcher =
    request.getRequestDispatcher("header.jsp");

dispatcher.include(request, response);

Explanation

Forward is commonly used by a controller servlet to send data to a JSP view.

Code:

request.setAttribute("user", user);

RequestDispatcher dispatcher =
    request.getRequestDispatcher("profile.jsp");

dispatcher.forward(request, response);

Explanation

Include is useful when common page sections such as headers, menus, and footers need to be reused.

Code:

out.println("<html>");

request.getRequestDispatcher("header.jsp")
       .include(request, response);

out.println("<main>Content</main>");

request.getRequestDispatcher("footer.jsp")
       .include(request, response);