### Source Code for Request Parameter Example

    import java.io.*;
    import java.util.*;
    import jakarta.servlet.*;
    import jakarta.servlet.http.*;

    public class RequestParamExample extends HttpServlet {

        public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws IOException, ServletException
        {
            response.setContentType("text/html");
            PrintWriter out = response.getWriter();
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Request Parameters Example</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h3>Request Parameters Example</h3>");
            out.println("Parameters in this request:<br>");

            String firstName = request.getParameter("firstname");
            String lastName = request.getParameter("lastname");

            if (firstName != null || lastName != null) {
                out.println("First Name:");
                out.println(" = " + HTMLFilter.filter(firstName) + "<br>");
                out.println("Last Name:");
                out.println(" = " + HTMLFilter.filter(lastName));
            } else {
                out.println("No Parameters, Please enter some");
            }
            out.println("<P>");
            out.print("<form action=\"");
            out.print("RequestParamExample\" ");
            out.println("method=POST>");
            out.println("First Name:");
            out.println("<input type=text size=20 name=firstname>");
            out.println("<br>");
            out.println("Last Name:");
            out.println("<input type=text size=20 name=lastname>");
            out.println("<br>");
            out.println("<input type=submit>");
            out.println("</form>");
            out.println("</body>");
            out.println("</html>");
        }

        public void doPost(HttpServletRequest request, HttpServletResponse res)
        throws IOException, ServletException
        {
            doGet(request, response);
        }
    }