cookie

/*
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 * and open the template in the editor.
 */
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author PCUSER
 */
@WebServlet(urlPatterns = {"/servlet2"})
public class servlet2 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 {

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

            Cookie ck[] = request.getCookies();
            out.print("Hello " + ck[0].getValue());

            out.println("<table>");
            out.println("<tr>");
            out.println("<th>Index</th>");
            out.println("<th>Name</th>");
            out.println("<th>Value</th>");
            out.println("</tr>");

            int index = 0;
            for(int i=0; i<ck.length; i++)
            {
                index++;
                String ckName = ck[i].getName();
                String ckValue = ck[i].getValue();

                if (!ckName.equals("password"))
                {
                   out.println("<tr>");
                   out.println("<td>" + index + "</td>");
                   out.println("<td>" + ckName + "</td>");
                   out.println("<td>" + ckValue + "</td>");
                   out.println("</tr>");
                }

                //deleting the cookie
                //by expiring it
                if (ckName.equals("password")) {
                    ck[i].setValue(null);
                    ck[i].setMaxAge(0);
                    response.addCookie(ck[i]);
                }
            }

            out.println("</table>");

            String result = getCookie("login", request);
            out.println("Login: " + result);

            out.close();

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

    protected String getCookie(String name, HttpServletRequest request)
    {
        Cookie ck[] = request.getCookies();

        String result = "none";

        for(int i=0; i<ck.length; i++)
        {
            String ckName = ck[i].getName();
            String ckValue = ck[i].getValue();

            if (ckName.equals(name)) {
                result =  ckValue;
                break;
            }
        }

        return result;
    }

    // <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>

}