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Forum:
JSP
JSP/servlet get or set parameters
Philippe Ponceblanc
Ranch Hand
Posts: 182
1
posted 1 year ago
hi,
I search to post or get a parametres with
jsp
and
servlets
, i do a little calculator !
jsp>>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Calculatrice</title> </head> <body> <h1>Calculette</h1> <form> <fieldset> <legend>Calculatrice</legend> <p> <label>Nombre N°1</label> <input type = "int" id = "nombre_un" value = 0 /> </p> <p> <label>Nombre N°2</label> <input type = "int" id = "nombre_deux" value = 0 /> <select name="drop1" id="Select1" size="4" multiple="multiple"> <option value="1">+</option> <option value="2">-</option> <option value="3">*</option> <option value="4">/</option> </select> <p> <input type="button" value="Calculer" onclick="alert('Bonjour !')"> <label>Résultat</label> <textarea> id = "myTextArea"</textarea> </p> </fieldset> </form> </body> </html>
Servlet >>
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String nombre_1 = (String) request.getParameter("nombre_un"); String nombre_2 = (String) request.getParameter("nombre_deux"); if ("".equals(nombre_1) || "".equals(nombre_2)) { request.setAttribute("erreur", "Vous devez remplir les deux champs."); getServletContext().getRequestDispatcher("/calculatrice.jsp").forward(request, response); } else { } } }
i ask how can i to put the reponse for example a+b=c , how to set c on click the button ?
regards
philippe
Bear Bibeault
Marshal
Posts: 67163
169
I like...
posted 1 year ago
Your HTML is wrong -- the input elements should have a
name
attribute not
id
.
E.g.
<input type = "number" name = "nombre_un" value = "0" />
Also note that type="int" is invalid, and that
you should
never omit the quotes around values.
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