Urgent: how to run applet which connected to the servlet?

hi frends:
i have written an applet on the server side and it supposed to pass parameters to my servlet and retrieve some info from the servlet.
i put both applet and servlet under tomcat../WEB-INF/classes. but when i run the applet from the web browser, there is no response from the servlet.
could anyone help me to solve this problem?
one more thing is i know that applet is able to connect to servlet, but how about java application? is it able to do so? if yes, is it also using URLconnection as applet? and how to run it?
i will be very appreciate if anyone can help me... thanx a million.

You can connect to the servlet from an application.There's a URL class in java.net that has an openConnection method. Then cast the return to an HttpURLConnection and use setMethod to set up as a post request.This may be the default if you call setDoOutput(true) on the URLConnection. Then you'll need to get an OutputStream and write properly formatted form POST data to it. It's also possible to encode your data on the URL, even when using the POST method, and this may be easier when doing it programmatically from an application. To send a get request you can append the name-value pair at the end of the url.

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erreursInitialisation.add("Le param�tre [" + param�tres[i] + "] n'a pas �t� initialis�");
} else {
// on m�morise la valeur du param�tre
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urlErreurs = config.getInitParameter("urlErreurs");
if (urlErreurs == null) {
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"Le param�tre [urlErreurs] n'a pas �t� initialis�");
@SuppressWarnings("unchecked")
public void doGet(HttpServletRequest request, HttpServletResponse response)
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// on v�rifie comment s'est pass�e l'initialisation de la servlet
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// on r�cup�re la m�thode d'envoi de la requ�te
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// on r�cup�re l'action � ex�cuter
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// 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")) {
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doValidationFormulaire(request, response);
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doEnregistrementFormulaire(request, response);
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if (m�thode.equals("post") && action.equals("retourFormulaire")) {
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doRetourFormulaire(request, response);
return;
// autres cas
doInit(request, response);
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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);
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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�");
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if (erreursAppel.size() != 0) {
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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);
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getServletContext().getRequestDispatcher((String) params.get("urlReponse")).forward(request,
response);
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//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);
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               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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