Create login form and perform state management using Cookies, HttpSession and URL Rewriting.

<html> <head> <title>Login</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> .b1 { width: 370px; height: 40px; margin: 10px; color: white; background-color: #008CBA; border: 0px solid grey; cursor: pointer; } .side { padding: 10px; margin: 10px; width: 370px; } h1 { color: white; } .box { margin-top: 200px; } </style> </head> <body bgcolor="#222222" align="center"> <div class="box"> <h1> Welcome to Login Portal</h1> <form action="FirstServlet" method="post"> <input class="side" type="text" name="userName" placeholder="Username" /><br /> <input class="side" type="password" name="password" placeholder="Password" /><br /> <input class="b1" type="submit" value="Login" /> </form> </div> </body> </html>

//First Servlet File
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;

public class FirstServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            response.setContentType("text/html");
            PrintWriter out = response.getWriter();
            String name = request.getParameter("userName");
            String pwd = request.getParameter("password");
            if (pwd.equals("birju") && name.equals("admin")) {
                out.print("<h1>Welcome " + name + "</h1>");
                Cookie ck = new Cookie("uname", name);// creating cookie object
                response.addCookie(ck);// adding cookie in the response
                out.print("<b>Cookie has been generated for this session<br></b>");
                out.print("<b>Click on button to view Cookie...</b>");
                // creating submit button
                out.print("<form action='SecondServlet' method='post'>");
                out.print("<br><input type='submit' value='go'>");
                out.print("</form>");
            } else {
                out.println("Incorrect Username or Password!!!");
            }
            out.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }

}

//Second Servlet File
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;

public class SecondServlet extends HttpServlet {

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

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

    }

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

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

            Cookie ck[] = request.getCookies();
            out.print("Value stored in Cookie : " + ck[0].getValue());

            out.close();

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

}

Posted by: Guest on April-30-2021

<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"> <servlet> <servlet-name>FirstServlet</servlet-name> <servlet-class>FirstServlet</servlet-class> </servlet> <servlet> <servlet-name>SecondServlet</servlet-name> <servlet-class>SecondServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>FirstServlet</servlet-name> <url-pattern>/FirstServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>SecondServlet</servlet-name> <url-pattern>/SecondServlet</url-pattern> </servlet-mapping> <session-config> <session-timeout> 30 </session-timeout> </session-config> </web-app>

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