How to get a selected values from listbox in a Servlet?

Question

In a servlet I want to get listbox selected values rendered by a JSP:

<td width="50%" type="text"  size="10">
    <select name="famille">
        <% while (rst.next()) {%>
            <option value="<%=rst.getString(1)%>" selected="selected">
                <%=rst.getString(1)%>
            </option>
        <% } %>
    </select>
</td>

Servlet code:

String famille = request.getParameter("famille");
System.out.println("famille      "+famille);

Only the first item is printed. How do I get the rest?

Answer 1

In your JSP, the HTML code needs a multiple attribute, as per select multiple:

<td width="50%" type="text"  size="10">
    <select name="famille" multiple> <!-- `multiple` needed here -->
        <% while (rst.next()) {%>
            <option value="<%=rst.getString(1)%>" selected="selected">
                <%=rst.getString(1)%>
            </option>
        <% } %>
    </select>
</td>

In your Servlet code, you need to use the multiple-parameter API call:

String[] famille = request.getParameterValues("famille"); // Returns an array
System.out.println("famille      " + java.util.Arrays.toString(famille));