Ceci est une ancienne révision du document !
TD n°1, éléments de correction
Exercice 1
Corrigé dans l'énoncé
Exercice 2
Exemple d'énumération des variables passées dans l'url :
<%@page import="java.util.Enumeration"%>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Récupération GET</title>
</head>
<body>
<table border="1">
<thead>
<tr>
<th>Nom</th>
<th>Valeur</th>
</tr>
</thead>
<%
Enumeration<String> names = request.getParameterNames();
while (names.hasMoreElements()) {
String name = names.nextElement();
String value = request.getParameter(name);
out.print("<tr>" + name + "<td></td><td>" + value + "</td></tr>");
}
%>
</table>
</body>
</html>
Exercice 3
Récupération des variables d'un formulaire posté dans une servlet
@WebServlet(name="Submit", urlPatterns = { "/submit.do" })
public class Submit extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Retourne le flux de sortie
* @param response
* @return
* @throws IOException
*/
private PrintWriter getOut(HttpServletResponse response) throws IOException{
response.setCharacterEncoding("UTF8");
response.setContentType("text/html");
PrintWriter out=response.getWriter();
return out;
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out=getOut(response);
out.print("Méthode GET interdite sur cette page");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out=getOut(response);
if(request.getParameter("name")!=null){
out.print("Informations saisies :<br>");
out.print("<div>Nom : "+request.getParameter("name")+"</div>");
if(request.getParameter("password")!=null)
out.print("<div>Mot de passe : "+request.getParameter("password")+"</div>");
}
}
}
Exercice 4
Gestion des informations temporaires, sessions et cookies
JSP et servlets, mise en place d’un contrôleur
Vues
<%@page import="net.td.utils.Gateway"%>
<%@page import="net.td.metier.Link"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String ck="";
String id=request.getParameter("id");
Link link=Gateway.getLink(request);
if(link!=null){
ck="<input type='checkbox' name='delete' id='delete'>";
ck+="<label for='delete'>Supprimer le lien</label>";
}else
link=new Link();
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Ajout/modification de lien</title>
</head>
<body>
<form action="update.do" method="post">
<input type="hidden" id="id" name="id" value="<%=id%>">
<div>
<label for="nom">Nom :</label>
<input type="text" name="nom" id="nom" value="<%=link.getNom()%>">
</div>
<div>
<label for="adresse">Adresse :</label>
<input type="text" name="adresse" id="adresse" value="<%=link.getAdresse()%>">
</div>
<div><%=ck %></div>
<input type="submit" value="Continuer >>">
</form>
</body>
</html>