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How to add and retrieve Sessions in JSP and Servlets using Session Management API ?



A simple web application showing how to add and retrieve Sessions in JSP and Servlets using Session Management API

1. mystyle.css (not mandatory) just for look and feel


body {
 font-family: Verdana, Geneva, Arial, helvetica, sans-serif;
 background-color: #FDF4DF;
 font-size: 14px;
 color: #FFFFFF;
}

td {
 font-family: Verdana, Geneva, Arial, helvetica, sans-serif;
 font-size: 14px;
}

th {
 font-family: Verdana, Geneva, Arial, helvetica, sans-serif;
 font-size: 14px;
}

.black {
 color: #000000;
 font-weight: bold;
}



2. register.jsp



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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Registration</title>
<link href="mystyle.css" rel="stylesheet" type="text/css">
</head>
<body>

 <form method="post" action="Register">
  <p>&nbsp;</p>
  <p align="center" class="black">Create a new Account :</p>
  <table align="center" bgcolor="#728DCF">
   <tr>
    <td>First Name</td>
    <td><input type="text" name=firstName size=30 class="smalltext"></td>
   </tr>
   <tr>
    <td>Last Name</td>
    <td><input type="text" name=lastName size=30 class="smalltext"></td>
   </tr>

   <tr>
    <td>Email Address</td>
    <td><input type="text" name=email size=40 class="smalltext"></td>
   </tr>

   <tr>
    <td>Password</td>
    <td><input type="password" name=password size=30
     class="smalltext"></td>
   </tr>
   <tr>
    <td colspan="2" align="center"><input type="submit"
     value="Register" /></td>
   </tr>
  </table>
 </form>

</body>
</html>


3. Register.java (Servlet)


import java.io.IOException;
import java.util.HashMap;
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;
import javax.servlet.http.HttpSession;


@WebServlet("/Register")
public class Register extends HttpServlet {


 protected void doGet (
   HttpServletRequest request, 
   HttpServletResponse response
   ) throws ServletException, IOException {

  doPost(request, response);

 }


 protected void doPost(
   HttpServletRequest request, 
   HttpServletResponse response
   ) throws ServletException, IOException {

  String firstName = request.getParameter("firstName");
  String lastName = request.getParameter("lastName");
  String email = request.getParameter("email");
  String password = request.getParameter("password");

  HashMap<String, String> userDetails = new HashMap<String, String>();
  userDetails.put("firstName", firstName);
  userDetails.put("lastName", lastName);
  userDetails.put("email", email);
  userDetails.put("password", password);

  // Creating a Session object and storing 
  // HashMap into it 
  HttpSession session = request.getSession();
  session.setAttribute("user", userDetails);
  // forwarding request to confirm.jsp page
  RequestDispatcher dispatcher = request.getRequestDispatcher("confirm.jsp");
  dispatcher.forward(request, response);

 }

}


4. confirm.jsp



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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Confirmed</title>
<link href="mystyle.css" rel="stylesheet" type="text/css">
</head>
<body>

 <%@ page import="java.util.*;"%>

 <%
  HashMap<String, String> userDetails = (HashMap) session
    .getAttribute("user");
  String firstName = "";
  String lastName = "";
  String emailAddress = "";
  if (userDetails != null) {
   firstName = userDetails.get("firstName");
   lastName = userDetails.get("lastName");
   emailAddress = userDetails.get("email");

  }
  else {

   firstName = null;
   lastName = null;
   emailAddress = null;

  }
 %>

 <p>&nbsp;</p>
 <p align="center" class="black">The information entered by you is
  as follows :</p>

 <table align="center" bgcolor="#728DCF">
  <tr>
   <td>First Name :</td>
   <%-- Below is the JSP expression used to display string value of an expression --%>
   <td><%=firstName%></td>
  </tr>

  <tr>
   <td>Last Name :</td>
   <td><%=lastName%></td>
  </tr>

  <tr>
   <td>Email Address :</td>
   <td><%=emailAddress%></td>
  </tr>
 </table>


</body>
</html>


Output of the program :


1. register.jsp screen view



















2. confirm.jsp screen view




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