I have a problem with my servlet that inserts data into the database. I have an HTML form with the POST method that sends the data to the servlet, which in turn inserts the data and redirects to a different form. I have tried using the sendRedirect and RequestDispatcher functions, but it didn't work. When I tried to display an error message in the catch block, it jumps directly to that part. When I remove the redirects and just display a message that the data has been inserted, it works fine. However, as soon as I add the redirect, everything starts to malfunction. I have the necessary libraries since I have already used select and delete queries, and they worked without any issues. What should I do?
Voici ma servlet qui insère des données dans la base de données :
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class AjouterFacture extends HttpServlet {
public void doPost(HttpServletRequest requete, HttpServletResponse reponse)
throws ServletException, IOException {
reponse.setContentType("text/html;charest=UTF-8");
String numfac = requete.getParameter("numfac");
String datefac = requete.getParameter("datefac");
String choix = requete.getParameter("choix");
int id = Integer.parseInt(requete.getParameter("id"));
String sqlQuery = "INSERT INTO
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/facturation", "root", "");
Statement stmt = con.createStatement();
int r = stmt.executeUpdate(sqlQuery);
if(r > 0){
RequestDispatcher rd = requete.getRequestDispatcher("FormulaireAjouterLigneFacture.jsp");
rd.forward(requete, reponse);
}
else{
RequestDispatcher rd = requete.getRequestDispatcher("FormulaireAjouterFacture.jsp");
rd.include(requete, reponse);
PrintWriter out = reponse.getWriter();
out.print("Insertion failed.");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
et ici sur la page JSP :
<body>
<div class="container">
<form method="POST" action="AjouterFacture">
<div class="form-group">
<label for="numfac">Numéro de facture :</label>
<input type="text" id="nom" name="numfac" required>
</div>
<div class="form-group">
<label for="datefac">Date facture :</label>
<input type="date" id="telephone" name="datefac" required>
</div>
<div class="form-group">
<label for="choix">Mode Paiement :</label>
<select name="choix">
<option value="carte">Carte bancaire</option>
<option value="cheque">Cheque bancaire</option>
<option value="liquide">Liquide</option>
</select>
</div>
<div class="form-group">
<label for="id">Id client :</label>
<input type="number" id="email" name="id" required>
</div>
<button class="btn-submit" type="submit">OK</button>
</form>
</div>
</body>
Voici ma servlet qui insère des données dans la base de données :
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class AjouterFacture extends HttpServlet {
public void doPost(HttpServletRequest requete, HttpServletResponse reponse)
throws ServletException, IOException {
reponse.setContentType("text/html;charest=UTF-8");
String numfac = requete.getParameter("numfac");
String datefac = requete.getParameter("datefac");
String choix = requete.getParameter("choix");
int id = Integer.parseInt(requete.getParameter("id"));
String sqlQuery = "INSERT INTO
facture(Num-facture, Date-facture, Mode-paiement, Id_client) VALUES ('" + numfac + "', '" + datefac + "', '" + choix + "', '" + id + "')";try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/facturation", "root", "");
Statement stmt = con.createStatement();
int r = stmt.executeUpdate(sqlQuery);
if(r > 0){
RequestDispatcher rd = requete.getRequestDispatcher("FormulaireAjouterLigneFacture.jsp");
rd.forward(requete, reponse);
}
else{
RequestDispatcher rd = requete.getRequestDispatcher("FormulaireAjouterFacture.jsp");
rd.include(requete, reponse);
PrintWriter out = reponse.getWriter();
out.print("Insertion failed.");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
et ici sur la page JSP :
<body>
<div class="container">
<form method="POST" action="AjouterFacture">
<div class="form-group">
<label for="numfac">Numéro de facture :</label>
<input type="text" id="nom" name="numfac" required>
</div>
<div class="form-group">
<label for="datefac">Date facture :</label>
<input type="date" id="telephone" name="datefac" required>
</div>
<div class="form-group">
<label for="choix">Mode Paiement :</label>
<select name="choix">
<option value="carte">Carte bancaire</option>
<option value="cheque">Cheque bancaire</option>
<option value="liquide">Liquide</option>
</select>
</div>
<div class="form-group">
<label for="id">Id client :</label>
<input type="number" id="email" name="id" required>
</div>
<button class="btn-submit" type="submit">OK</button>
</form>
</div>
</body>
