Session Management Using Cookies

Practical : 10
Subject : Advanced Java
Aim : Create login form and perform state management using Cookies, HttpSession and URL Rewriting.

index.html Code:
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<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>

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FirstServlet.java Code:
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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);}
  }

}

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SecondServlet.java Code:
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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);}
}

}

--------------------------------------------------------------------------------
web.xml Code:
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<?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>

--------------------------------------------------------------------------------

Output:
index.html

FirstServlet
SecondServlet








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