Cookie login logout session example using Servlet jsp

By candid | Posted : Aug 22, 2015 | Updated : Jul 29, 2017

This tutorial explains how to create and login logout code using stateless client based session cookie.

Creates a cookie, a small amount of information sent by a servlet to a Web browser, saved by the browser, and later sent back to the server. A cookie's value can uniquely identify a client, so cookies are commonly used for session management. Read More

Environment used:

Eclipse luna

Jdk 1.8

Servlet 2.5 web module

Tomcat 8 (require servlet 3.1 jar)

Step 1:

Create a simple login page login.html

<%@ 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>Insert title here</title>
</head>
<body>
<form action="login1" method="post">
      User:<br/><input type="text" name="user"/><br/>
      Password:<br/><input type="password" name="password"/><br/>
      <input type="submit" value="Login"/>
      </form>
</body>
</html>

Step 2:

Create a Login Servlet (Login.java).

This servlet will

1. Authenticate the user (username: candidjava , password: candidjava)

2. create new cookie object

3. redirect to home page

If the username password is invalid it will redirect to login.html with an error message.

package com.candidjava.servlet.cookie;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Login extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String un = request.getParameter("uname");
		String pw = request.getParameter("pass");

		PrintWriter out = response.getWriter();
		Cookie ck = new Cookie("auth", un);
		ck.setMaxAge(600);
		if (un.equals("candidjava") & pw.equals("candidjava")) {
			response.addCookie(ck);
			response.sendRedirect("home.jsp");
			return;
		} else {
			RequestDispatcher rd = request.getRequestDispatcher("login.html");
			out.println("Either user name or password is wrong.");
			rd.include(request, response);
		}
	}
}

Step 3:

home.jsp

This page will be loaded after successful login, and it will automatically logged out if the session time exceeds 10min or if user deleted all cookie from the browser

<%@ 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>Insert title here</title>
</head>
<body>
	<%
		Cookie[] cks = request.getCookies();
		if (cks != null) {
			for (int i = 0; i < cks.length; i++) {
				String name = cks[i].getName();
				String value = cks[i].getValue();
				if (name.equals("auth")) {
					break; // exit the loop and continue the page
				}
				if (i == (cks.length - 1)) // if all cookie are not valid redirect to error page
				{
					response.sendRedirect("sessionExpired.html");
					return; // to stop further execution
				}
				i++;
			}
		} else {
			response.sendRedirect("sessionExpired.html");
			return; // to stop further execution
		}
	%>
	<h3>You had successfully logged in.</h3>
	<br> your session is set to expire in 10min
	<br> try reloading after 10 min
	<br>
	<form action="Logout" method="post">
		<input type="submit" value="Logout">
	</form>
</body>
</html>

Step 4:

web.xml mapping

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://java.sun.com/xml/ns/javaee" 
   xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
   http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
   id="WebApp_ID" version="3.0">
   
   <display-name>Struts 2</display-name>
   <welcome-file-list>
      <welcome-file>index.jsp</welcome-file>
   </welcome-file-list>
   <filter>
      <filter-name>struts2</filter-name>
      <filter-class>
         org.apache.struts2.dispatcher.FilterDispatcher
      </filter-class>
   </filter>

   <filter-mapping>
      <filter-name>struts2</filter-name>
      <url-pattern>/*</url-pattern>
   </filter-mapping>
</web-app>

Screen shot

Download Example

War file : cookie example

Zip file : Cookie example

Simple registration example using servlet and JSP

Registration form in jsp with database connectivity

Simple login example using Servlet and JSP

Cookie login logout session example using Servlet jsp

Servlet Jsp HttpSession Login logout example

File download example using servlet and jsp

File upload example using servlet and Jsp

Comments

melbasegura7
Hurrah, that's what I was seeking for, what a information! existing here at this website, thanks admin of this website.

Ellkeyday
Foro Cialis Levitra Viagra viagra Amoxicillin And Gout Levitra Ersatz Suche Viagra Kaufen

Donaldroorm
Hell0?! Th�?s i�? sympathetic standoffish slow theme but I neediness s?mе hеlp frоm аn established blog. Is it ?ard to set up yo?r owwn blog? porn videos ?'m not extremely techincal Ьut I can amount t?ings o?t pretty quick. I'm thought аbout making m? own but I'm nott s?re where to start. D? you come by any place or suggestions?

Cookie login logout session example using Servlet jsp

Comments

Recent Posts