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Session Management Using Cookies in Servlet

Program 1

<!DOCTYPE html>
<!--
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To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
    <head>
        <title>TODO supply a title</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
    </head>
    <body>
        <form method="post" action="CookieServlet1">
         <center>
             <table border="1">
                 <tr>
                     <th>Employee ID</th>
                     <td><input type="text" name="txtId"></td>
                 </tr>
                 <tr>
                     <th>Employee Name</th>
                     <td><input type="text" name="txtName"></td>
                 </tr>
                 <tr>
                     <th>Mobile Number</th>
                     <td><input type="text" name="txtMobile"></td>
                 </tr>
                <tr>
                    <td></td>
                    <td><input type="submit" value="Submit"></td>
                </tr> 
             </table>    
                 
         </center>    
    </body>
</html>

Program 2

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

package controller;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author admin
 */
public class CookiServlet1 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 CookiServlet1</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet CookiServlet1 at " + request.getContextPath() + "</h1>");
            out.println("<center>");
            String empid,salary;
            String name;
            empid=request.getParameter("txtId");
            name=request.getParameter("txtName");
            salary=request.getParameter("txtSalary");  
            out.println("Employee ID="+empid);
            out.println("Employee NAME="+name);
            out.println("Employee SALARY="+salary);
            Cookie C1=new Cookie("id", empid);
            Cookie C2=new Cookie("name", name);        
            Cookie C3=new Cookie("sal", salary);
            response.addCookie(C1);
            response.addCookie(C2);
            response.addCookie(C3);
            out.println("<form method=post action=CookiServlet2>");
            out.println("<input type=submit value=Submit>");
            out.println("<form>");
            out.println("</center>");
            out.println("</body>");
            out.println("</html>");
        }
    }

    
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    
    @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>

}

Program 3

/*
 * 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 controller;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author admin
 */
public class CookiServlet2 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 CookiServlet2</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet CookiServlet2 at " + request.getContextPath() + "</h1>");
            Cookie C[];
            C=request.getCookies();
             int i;
             for(i=0;i<C.length;i++)
             {
               // out.println("Cookie Name: "+C[i].getName());
                out.println("<br>");
                out.println("Cookie Value: "+C[i].getValue());
             } 
            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>

}

 

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