Call methods (which are in the servlet) in my response page

Hello !
I want to call methods which are in the servlet ( its name is ServletRecap) BUT the call is made in the response page which is generated by the servlet ServletRecap !
I just want to allow the user to update his choice in the response page.
example: i choice A in the initial form but i change my mind and now i want to choice B in the response page : the choice have to be update in the database.
the insertion in the DB is made by a method in the servlet : so i have to recall the method in the response page!
Please, anybody have an idea ?
my servlet :
public class ServletRecap extends HttpServlet {
    // param�tres d'instance
    private String urlErreurs = null;
    private ArrayList erreursInitialisation = new ArrayList<String>();
    private String[] param�tres = {"urlFormulaire", "urlReponse", "urlControleur", "lienRetourFormulaire"};
    private Map params = new HashMap<String, String>();
    // init
    @SuppressWarnings("unchecked")
    public void init() throws ServletException {
        // on r�cup�re les param�tres d'initialisation de la servlet
        ServletConfig config = getServletConfig();
        // on traite les autres param�tres d'initialisation
        String valeur = null;
        for (int i = 0; i < param�tres.length; i++) {
        // valeur du param�tre
            valeur = config.getInitParameter(param�tres);
// param�tre pr�sent ?
if (valeur == null) {
// on note l'erreur
erreursInitialisation.add("Le param�tre [" + param�tres[i] + "] n'a pas �t� initialis�");
} else {
// on m�morise la valeur du param�tre
params.put(param�tres[i], valeur);
// l'url de la vue [erreurs] a un traitement particulier
urlErreurs = config.getInitParameter("urlErreurs");
if (urlErreurs == null) {
throw new ServletException(
"Le param�tre [urlErreurs] n'a pas �t� initialis�");
@SuppressWarnings("unchecked")
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
// on v�rifie comment s'est pass�e l'initialisation de la servlet
if (erreursInitialisation.size() != 0) {
// on passe la main � la page d'erreurs
request.setAttribute("erreurs", erreursInitialisation);
request.setAttribute("lienRetourFormulaire", "");
getServletContext().getRequestDispatcher(urlErreurs).forward(
request, response);
// fin
return;
// on r�cup�re la m�thode d'envoi de la requ�te
String m�thode = request.getMethod().toLowerCase();
// on r�cup�re l'action � ex�cuter
String action = request.getParameter("action");
// action ?
if (action == null) {
action = "init";
// ex�cution action
if (m�thode.equals("get") && action.equals("init")) {
// d�marrage application
doInit(request, response);
return;
if (m�thode.equals("post") && action.equals("validationFormulaire")) {
// validation du formulaire de saisie
doValidationFormulaire(request, response);
return;
if (m�thode.equals("post") && action.equals("enregistrementFormulaire")) {
// enregistrement du formulaire de saisie
doEnregistrementFormulaire(request, response);
return;
if (m�thode.equals("post") && action.equals("retourFormulaire")) {
// retour au formulaire de saisie
doRetourFormulaire(request, response);
return;
// autres cas
doInit(request, response);
// validation du formulaire
void doValidationFormulaire(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// on r�cup�re les param�tres
String nomCentre = (String) request.getParameter("nomCentre");
String idCentre = (String) request.getParameter("idCentre");
String nomPreleveur = (String) request.getParameter("nomPreleveur");
String datePrelev = (String) request.getParameter("datePrelev");
String numFinFiche = (String) request.getParameter("numFinFiche");
// qu'on m�morise dans la session
HttpSession session = request.getSession(true);
session.setAttribute("nomCentre", nomCentre);
session.setAttribute("idCentre", idCentre);
session.setAttribute("nomPreleveur", nomPreleveur);
session.setAttribute("datePrelev", datePrelev);
session.setAttribute("numFinFiche", numFinFiche);
// v�rification des param�tres
ArrayList<String> erreursAppel = new ArrayList<String>();
// le nom doit �tre non vide
nomCentre = nomCentre.trim();
idCentre = idCentre.trim();
nomPreleveur = nomPreleveur.trim();
datePrelev = datePrelev.trim();
numFinFiche = numFinFiche.trim();
if (nomCentre.equals("")) {
erreursAppel.add("Le champ [nomCentre] n'a pas �t� rempli");
if (idCentre.equals("")) {
erreursAppel.add("Le champ [idCentre] n'a pas �t� rempli");
if (nomPreleveur.equals("")) {
erreursAppel.add("Le champ [nomPreleveur] n'a pas �t� rempli");
if (datePrelev.equals("")) {
erreursAppel.add("Le champ [datePrelev] n'a pas �t� rempli");
if (!numFinFiche.matches("^\\s*\\d+\\s*$")) {
erreursAppel.add("Le champ [numFinFiche] est erron�");
// des erreurs dans les param�tres ?
if (erreursAppel.size() != 0) {
// on envoie la page d'erreurs
request.setAttribute("erreurs", erreursAppel);
request.setAttribute("lienRetourFormulaire", (String) params.get("lienRetourFormulaire"));
getServletContext().getRequestDispatcher(urlErreurs).forward(
request, response);
return;
// les param�tres sont corrects - on envoie la page r�ponse
request.setAttribute("nomCentre",nomCentre);
request.setAttribute("idCentre",idCentre);
request.setAttribute("nomPreleveur",nomPreleveur);
request.setAttribute("datePrelev",datePrelev);
request.setAttribute("numFinFiche",numFinFiche);
          request.setAttribute("lienRetourFormulaire", (String) params.get("lienRetourFormulaire"));
getServletContext().getRequestDispatcher((String) params.get("urlReponse")).forward(request,
response);
return;
//enregistre dans la base de donn�e les variables
void doEnregistrementFormulaire(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
     String nomCentre = (String) request.getParameter("nomCentre");
String idCentre = (String) request.getParameter("idCentre");
String nomPreleveur = (String) request.getParameter("nomPreleveur");
String datePrelev = (String) request.getParameter("datePrelev");
String numFinFiche = (String) request.getParameter("numFinFiche");
     String nEtude = datePrelev + "." + idCentre + "." + numFinFiche;
//      qu'on m�morise dans la session
HttpSession session = request.getSession(true);
session.setAttribute("nomCentre", nomCentre);
session.setAttribute("idCentre", idCentre);
session.setAttribute("nomPreleveur", nomPreleveur);
session.setAttribute("datePrelev", datePrelev);
session.setAttribute("numFinFiche", numFinFiche);
     Connexion com = new Connexion();
          try{
               //serveur,login,pwd,database
               com.loadDriverAndConnect("127.0.0.1","3306","root","root","");
               com.execute("USE BIOTECH");
               com.execute("INSERT INTO RECAP (NEtude,NomCentre,idCentre,nomPreleveur,datePrelev) " +
                         "values ('"+nEtude+"','"+nomCentre+"','"+idCentre+"','"+nomPreleveur+"','"+ datePrelev + "')") ;
               com.close();
          catch(Exception ex) {
               System.err.println("\n*** SQLException caught in main()");
          request.setAttribute("urlAction", (String) params.get("urlControleur"));
          getServletContext().getRequestDispatcher((String) params.get("urlReponse")).forward(request,
response);
          return;
// affichage formulaire pr�-rempli
void doRetourFormulaire(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
// on r�cup�re la session de l'utilisateur
HttpSession session = request.getSession(true);
// on pr�pare le mod�le du formulaire
// nom pr�sent dans la session ?
String nomCentre = (String) session.getAttribute("nomCentre");
if (nomCentre == null) {
session.setAttribute("nomCentre", "");
String idCentre = (String) session.getAttribute("idCentre");
if (idCentre == null) {
session.setAttribute("idCentre", "");
String nomPreleveur = (String) session.getAttribute("nomPreleveur");
if (nomPreleveur == null) {
session.setAttribute("nomPreleveur", "");
String datePrelev = (String) session.getAttribute("datePrelev");
if (datePrelev == null) {
session.setAttribute("datePrelev", "");
String numFinFiche = (String) session.getAttribute("numFinFiche");
if (numFinFiche == null) {
session.setAttribute("numFinFiche", "");
// urlAction
request.setAttribute("urlAction", (String) params.get("urlControleur"));
// on affiche le formulaire
getServletContext().getRequestDispatcher((String) params.get("urlFormulaire")).forward(
request, response);
return;
// post
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
// on passe la main au GET
doGet(request, response);
my initial form:%
// on r�cup�re les param�tres dans la session
     String nomCentre=(String)session.getAttribute("nomCentre");
     String idCentre= (String)session.getAttribute("idCentre");
     String nomPreleveur = (String)session.getAttribute("nomPreleveur");
     String datePrelev=(String)session.getAttribute("datePrelev");
     String numFinFiche=(String)session.getAttribute("numFinFiche");
     String urlAction=(String)request.getAttribute("urlAction");
%>
<html>
<head>
<title>Fiche répitulative - formulaire</title>
</head>
<body>
<center>
     <img src="logoBiotech.jpg" align="left" alt="logo Biotech-Germande" width="5%"></img>
<h2>Fiche répitulative - formulaire</h2>
     <br>
<hr>
<form action="<%= urlAction %>" method="post">
[... page setting: made by html language ...]
<td><input type="submit" name="action" value="validationFormulaire"></td>
<td><input type="reset" value="Rétablir"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
my response page:<%
// on r�cup�re les donn�es
     String nomCentre=(String)session.getAttribute("nomCentre");
     String idCentre= (String)session.getAttribute("idCentre");
     String nomPreleveur = (String)session.getAttribute("nomPreleveur");
     String datePrelev=(String)session.getAttribute("datePrelev");
     String numFinFiche=(String)session.getAttribute("numFinFiche");
     String urlAction=(String)request.getAttribute("urlAction");
%>
<html>
<head>
<title>Fiche répitulative - formulaire</title>
</head>
<body>
<form action="<%= urlAction %>" method="post">
[... page setting: made by html language ...]
<br><br>
               <td><input type="submit" name="action" value="enregistrementFormulaire"></td>
               <td><input type="submit" name="action" value="retourFormulaire"></td>
</body>
</html>
my web.xml:

<servlet>
<servlet-name>FicheRecap</servlet-name>
<servlet-class>germande.ServletRecap</servlet-class>
<init-param>
<param-name>urlReponse</param-name>
<param-value>/WEB-INF/JSP/Recap/reponseRecap.biotech.jsp</param-value>
</init-param>
<init-param>
<param-name>urlErreurs</param-name>
<param-value>/erreursRecap.biotech.jsp</param-value>
</init-param>
<init-param>
<param-name>urlFormulaire</param-name>
<param-value>/WEB-INF/JSP/Recap/formulaireRecap.biotech.jsp</param-value>
</init-param>
<init-param>
<param-name>urlControleur</param-name>
<param-value>ServletRecap</param-value>
</init-param>
<init-param>
<param-name>lienRetourFormulaire</param-name>
<param-value>Retour au formulaire</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>FicheRecap</servlet-name>
<url-pattern>/ServletRecap</url-pattern>
</servlet-mapping>
</web-apps>
Thanks in advance for your idea.
I resume : how can I call a method in my servlet into my response page (in jsp).
the servlet generate this response page and i just want to update the choice of my user.
Thanks !!

I resume : how can I call a method in my servlet into my response page (in jsp).Don't do that. Put the message into a plain old Java class which can be called from both the servlet and the JSP.

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