correction authent : message si utilisateur déjà connu veut créer un compte

WEB-INF/src/controleurs/SignUp.java

@@ -25,9 +25,9 @@ public class SignUp extends HttpServlet {
 
         }
         else {
+            if (!userdao.userExists(login, pwd)) {
                 userdao.createUser(login, pwd);
                 User user = userdao.getUserByLogs(login, pwd);
-
                 if (user != null && userdao.isDatabased(user)){
                     out.println("<h1>Bienvenue " + user.getUserName() + " !</h1>");
                     req.getSession().setAttribute("user", user);
@@ -38,5 +38,10 @@ public class SignUp extends HttpServlet {
                     userdao.removeUser(user);
                 }
             }
+            else {
+                out.println("<h1>You already own an account. Please login <a href=\"http://localhost:8080/s4a021-web-backend/index.html\">here</a></h1>");
+            }
+
+        }
     }
 }

WEB-INF/src/dao/UserDAO.java

@@ -118,6 +118,13 @@ public class UserDAO {
         return user;
     }
 
+    public boolean userExists(String login, String password) {
+        if (getUserByLogs(login, password) == null) {
+            return false;
+        } 
+        return true;
+    }
+
     public void addUser(User nUser){
         try{
             PreparedStatement stmt = this.con.prepareStatement("INSERT INTO userAccount (username, password) VALUES (?,?)");