Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package servlet; import data.S; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.hibernate.HibernateException; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.boot.registry.StandardServiceRegistryBuilder; import org.hibernate.cfg.Configuration; /** * * @author Eric */ public class NewS extends HttpServlet { /** * Processes requests for both HTTP <code>GET</code> and <code>POST</code> * methods. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); try (PrintWriter out = response.getWriter()) { /* TODO output your page here. You may use following sample code. */ out.println("<!DOCTYPE html>"); out.println("<html>"); out.println("<head>"); out.println("<title>Servlet NewS</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Servlet NewS at " + request.getContextPath() + "</h1>"); // No try catch, I suppose the connexion will be okey... Configuration configuration = new Configuration(); configuration.configure("hibernate.cfg.xml"); StandardServiceRegistryBuilder ssrb = new StandardServiceRegistryBuilder() .applySettings(configuration.getProperties()); SessionFactory sessionFactory = configuration.buildSessionFactory(ssrb.build()); Session session = sessionFactory.openSession(); Transaction trans = session.beginTransaction(); try { //String id = request.getParameter("s_id").trim(); String name = request.getParameter("s_name").trim(); Query query = session.createQuery("from data.S s where s.name = :aName"); query.setParameter("aName", name); if ((S) query.uniqueResult() != null) { throw new HibernateException(new Throwable("This Service name already exists")); } S s = new S(); s.setName(name); session.persist(s); trans.commit(); session.close(); out.println("The creation of this Service has succeded !!<br/>"); } catch (HibernateException he) { out.println(he.getMessage() + "<br/>"); //out.println(he.getCause() + "<br/>"); out.println("The creation of this Service has failed...<br/>"); trans.rollback(); session.close(); } out.println("</body>"); out.println("</html>"); } } // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> /** * Handles the HTTP <code>GET</code> method. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Handles the HTTP <code>POST</code> method. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Returns a short description of the servlet. * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold> }