CODEWITHSUNDEEP
javajspservletsjakarta-ee
j0w
j0w

Reputation: 545

How to get select value in a JSP to a servlet ? JAVAEE

first pic here after month reading posts to help me so, kinda excited ! :D I'm currently learning JavaEE in scholl and have a problem to get values from a select box in my JSP file.

Here is what I want to do : get the value from the select box when I click "add to card", put that in a list (in the servlet) et show that list back in my jsp file. I give you the code I have for now (probably kin of ugly, sorry, first days...)

Servlet :

public class CommandeServlet extends HttpServlet {

    private List listePlatsCommandes = new ArrayList();

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doWork(request, response);
    }

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

    private void doWork(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        CommandeModel beanSessionCommande = (CommandeModel) request.getSession().getAttribute("beanSessionCommande");




        if (request.getParameterMap().isEmpty()) {
            beanSessionCommande = new CommandeModel();
        } else if (request.getParameter("submit") != null) {

            listePlatsCommandes.add(request.getParameter("platCommande"));
            Commande com = new Commande(request.getParameter("libelle"), listePlatsCommandes);

            CommandeManagerSingl.getInstance().ajouter(com);

            beanSessionCommande.setCommande(com);


        }
        System.out.println(listePlatsCommandes);
        request.getSession().setAttribute("beanSessionCommande", beanSessionCommande);
        request.getRequestDispatcher("/WEB-INF/commande.jsp").forward(request, response);
    }
}

Model : 

public class CommandeModel {

    private List<Plat> plats;
    private Commande commande;

    public CommandeModel() {

        this.plats = new ArrayList<Plat>();
        this.commande = new Commande();
    }

    public List<Plat> getPlats() {
        return plats;
    }

    public void addPlat(Plat plat) {
        plats.add(plat);
    }

    public void setPlats(List<Plat> plats) {
        this.plats = plats;
    }

    public Commande getCommande() {
        return commande;
    }

    public void setCommande(Commande commande) {
        this.commande = commande;
    }
}

JSP file :

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
         pageEncoding="ISO-8859-1" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title>Commande</title>
</head>
<body>
<a href="/PlatServlet">Plats</a> - <a href="/CommandeServlet">Commandes</a>
<h1>Gestion des commandes</h1>

<div>
    <form action="CommandeServlet">

        <select name="listePlats">

            <c:forEach var="plat" items="${beanSessionPlat.listePlats}">
                <option name="platCommande" value=" ${plat.libelle} " selected="selected"> ${plat.libelle} </option>
            </c:forEach>

        </select>

        <input type="submit" value="Add to cart" name="submit">
    </form>
</div>

<div>
    <!-- ICI LA LISTE DE LA COMMANDE -->
<h3>Résumé de la commande :</h3> <br><br>
    <table border="1">

        <c:forEach var="com" items="${beanSessionCommande.plats}">
            <tr>
                <td> ${com} </td>
            </tr>
        </c:forEach>
    </table>
</div>

</body>
</html>

Forgot to say : everything is in Session for now, and i get the select list filled up with a list i get from another JSP file

Thanks a lot for helping :)

Upvotes: 1

Views: 3684

Answers (1)

Roman Puchkovskiy
Roman Puchkovskiy

Reputation: 11835

As the only <select> tag you have has name equal to listePlats, it will be submitted under this name.

request.getParameter("listePlats") will return the value of the selected option.

By the way, it seems that you mark all options as selected. I doubt this is useful: only one (or none) should be marked as such for a non-multi <select>.

Upvotes: 1

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