nefunguje:D

/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Lívia
 */
@WebServlet(urlPatterns = {"/reg"})
public class reg extends HttpServlet {
 String driver = "com.mysql.jdbc.Driver";
     Connection con = null;
     Statement stmt = null;
     ResultSet rs = null;
     String userName = "root";
     String password = "";
     String URL = "jdbc:mysql://localhost/mydb";

    /**
     * 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
     */
public void Formular(PrintWriter out) {

 out.print("<html>\n" +
"<style>\n" +
"/* Full-width input fields */\n" +
"input[type=text], input[type=password] {\n" +
"    width: 100%;\n" +
"    padding: 12px 20px;\n" +
"    margin: 8px 0;\n" +
"    display: inline-block;\n" +
"    border: 1px solid #ccc;\n" +
"    box-sizing: border-box;\n" +
"}\n" +
"\n" +
"/* Set a style for all buttons */\n" +
"button {\n" +
"    background-color: #4CAF50;\n" +
"    color: white;\n" +
"    padding: 14px 20px;\n" +
"    margin: 8px 0;\n" +
"    border: none;\n" +
"    cursor: pointer;\n" +
"    width: 100%;\n" +
"}\n" +
"\n" +
"/* Extra styles for the cancel button */\n" +
".cancelbtn {\n" +
"    padding: 14px 20px;\n" +
"    background-color: #f44336;\n" +
"}\n" +
"\n" +
"/* Float cancel and signup buttons and add an equal width */\n" +
".cancelbtn,.signupbtn {\n" +
"    float: left;\n" +
"    width: 50%;\n" +
"}\n" +
"\n" +
"/* Add padding to container elements */\n" +
".container {\n" +
"    padding: 16px;\n" +
"}\n" +
"\n" +
"/* Clear floats */\n" +
".clearfix::after {\n" +
"    content: \"\";\n" +
"    clear: both;\n" +
"    display: table;\n" +
"}\n" +
"\n" +
"/* Change styles for cancel button and signup button on extra small screens */\n" +
"@media screen and (max-width: 300px) {\n" +
"    .cancelbtn, .signupbtn {\n" +
"       width: 50%;\n" +
"    }\n" +
"}\n" +
"</style>\n" +
"<body>\n" +
" <center>\n" +

"<h2>Registračný formulár</h2>\n" +
" </center>\n" +
//------------FORMULAR---------------------------------
"<form action=\"/action_page.php\" style=\"border:1px solid #ccc\">\n" +
"  <div class=\"container\">\n" +
//------------MENO--------------------------------------
"    <label><b>Meno</b></label>\n" +
"    <input type=\"text\" placeholder=\" Vložte Meno\" name=\"meno\" required>\n" +
"\n" +
//------------PRIEZVISKO--------------------------------
"<label><b>Priezvisko</b></label>\n" +
"    <input type=\"text\" placeholder=\" Vložte Priezvisko\" name=\"email\" required>\n" +
"\n" +
//------------EMAIL------------------------------------
"<label><b>Email</b></label>\n" +
"    <input type=\"text\" placeholder=\" Vložte Email\" name=\"email\" required>\n" +
"\n" +
//------------LOGIN---------------------------------------
"<label><b>Login</b></label>\n" +
"    <input type=\"text\" placeholder=\" Vložte Login\" name=\"Login\" required>\n" +
"\n" +
"\n" +
//------------HESLO----------------------------------------
"    <label><b>Heslo</b></label>\n" +
"    <input type=\"password\" placeholder=\"Vložte Heslo\" name=\"psw\" required>\n" +
"\n" +
//ZNOVU HESLO--------------------------------------------
"    <label><b>Zopakujte Heslo</b></label>\n" +
"    <input type=\"password\" placeholder=\"Zopakujte Heslo\" name=\"psw-repeat\" required>\n" +
"    <input type=\"checkbox\" checked=\"checked\"> Zapamätať\n" +
"    <p>Vytvorením účtu súhlasíte s <a href=\"#\">Obchodnými podmienkami</a>.</p>\n" +
"\n" +
"    <div class=\"clearfix\">\n" +
//--------------ODIST---------------------
"      <button type=\"button\" class=\"cancelbtn\">Odísť</button>\n" +
//---------------REGISTROVAT---------------------
"      <button type=\"submit\"name =\"tlacidlo\" class=\"signupbtn\">Registrovať</button>\n" +
"    </div>\n" +
"  </div>\n" +
"</form>\n" +
"\n" +
"</body>\n" +
"</html>");

    }


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>");
            String tlacidlo2 = (request.getParameter("tlacidlo")).substring(0,1);
          if(tlacidlo2.equals("Z")){
            Formular(out);

             }
          if(tlacidlo2.equals("R")){

		String a=request.getParameter("meno");
		String b=request.getParameter("priezvisko");
		String c=request.getParameter("email");
		String d=request.getParameter("login");
		String e=request.getParameter("heslo");

                try{
		Class.forName("com.mysql.jdbc.Driver");
		 con = DriverManager.getConnection(URL, userName, password);
		PreparedStatement ps=con.prepareStatement("insert into pouzivatelia values(?,?,?,?)");
		ps.setString(1,a);
		ps.setString(2,b);
		ps.setString(3,c);
		ps.setString(4,d);
		ps.setString(5,e);
		int i=ps.executeUpdate();
		if(i>0)
		out.print("You are successfully registered...");


		}catch (Exception e2) {System.out.println(e2);}

		out.close();
	}


        }
    }

    // <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);
    response.setContentType("text/html");
		PrintWriter out = response.getWriter();

           }


    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}