Passando parametros pelo servlet

Front-end
#1

Como eu faço para passar como parâmetro um dado selecionado em um selectOneManu como mostrado abaixo:

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>

<%@taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@taglib prefix="h" uri="http://java.sun.com/jsf/html"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">

<%--
    This file is an entry point for JavaServer Faces application.
--%>

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <f:view>
            <h1><h:outputText value="Selecionar Região" /></h1>
            <h:selectOneMenu>
                <f:selectItem itemLabel="SP" itemValue="sp" id="sp"/>
                <f:selectItem itemLabel="RJ" itemValue="rj" id="rj"/>
                <f:selectItem itemLabel="MG" itemValue="mg" id="mg"/>
            </h:selectOneMenu>
            <h:commandButton value="Enviar"/>
            
        </f:view>
    </body>
</html>

eu quero que a opção selecionada no selectOneMenu seja passado para o meu bean.

public class PegaOpcaoServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        PegaOpcao pegaOpcao = new PegaOpcao();
        try {
            String id = request.getParameter("id");
                } finally {
            out.close();
        }
    }

  
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     */
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
#2