Practical-15 Create a web form which processes servlet and demonstrates use of cookies and sessions.

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Use of Cookies in Servlet:

index.html:

<!DOCTYPE html>
<html>
    <head>
        <title>Use of Cookie</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
    </head>
    <body>
         <form id="CookiDemo" action="AddCookieServlet" method="POST">
            <b>Enter a value for MyCookie:</b>
            <input type="text" name="data" size=25 value=""/>
            <br><br>
            <input type="submit" name="Submit"/>
        </form>
    </body>
</html>


Create Two Servlet File with name AddCookieServlet and GetCookieServlet

1. AddCookieServlet.java:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class AddCookieServlet extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter out=response.getWriter();
        String data=request.getParameter("data");
        Cookie cookie=new Cookie("MyCookie",data);
        response.addCookie(cookie);
        out.println("<b>Cookie Created: MyCookie=");
        out.println(data);
        out.println("<a href='GetCookieServlet'> Click to access</a>");
        out.close();        
    }
}

2. GetCookieServlet.java:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class GetCookieServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        Cookie[] cookies=request.getCookies();
        response.setContentType("text/html");
        PrintWriter out=response.getWriter();
        out.println("<b>");
        for(int i=0;i<cookies.length;i++)
        {
            String name=cookies[i].getName();
            String value=cookies[i].getValue();
            out.println("name="+name+" value="+value);
        }
        out.close();
    }
}

web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="4.0" 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_4_0.xsd">
    <servlet>
        <servlet-name>AddCookieServlet</servlet-name>
        <servlet-class>AddCookieServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>GetCookieServlet</servlet-name>
        <servlet-class>GetCookieServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>AddCookieServlet</servlet-name>
        <url-pattern>/AddCookieServlet</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>GetCookieServlet</servlet-name>
        <url-pattern>/GetCookieServlet</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
</web-app>


Use of Session in Servlet:

index.html:

<!DOCTYPE html>
<html>
    <head>
        <title>Use of Session</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
    </head>
    <body>
        <form id="SessionDemo" action="SessionServlet" method="GET">
            <label>Username:</label>
            <input type="text" name="name"/>
            <br><br>
            <input type="submit" name="Submit"/>
        </form>
    </body>
</html>

Create Two Servlet File with name SessionServlet and SessionTrack

1. SessionServlet.java:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class SessionServlet extends HttpServlet {
    
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
    try
    {
        response.setContentType("text/html");
        PrintWriter out=response.getWriter();
        String n=request.getParameter("name");
        out.print("Welcome: "+n);
        HttpSession session=request.getSession();
        session.setAttribute("uname", n);
        out.print("<a href='SessionTrack'> Check Session Tracking</a>");
        out.close();
    }
    catch(Exception e)
    {
        System.out.println(e);
    }
    }
}

2. SessionTrack.java:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class SessionTrack extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try
        {
            response.setContentType("text/html");
            PrintWriter out=response.getWriter();
            HttpSession session=request.getSession(false);
            String n=(String)session.getAttribute("uname");
            out.print("Hello "+n);
            out.close();
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
    }
}

web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="4.0" 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_4_0.xsd">
    <servlet>
        <servlet-name>SessionServlet</servlet-name>
        <servlet-class>SessionServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>SessionTrack</servlet-name>
        <servlet-class>SessionTrack</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>SessionServlet</servlet-name>
        <url-pattern>/SessionServlet</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>SessionTrack</servlet-name>
        <url-pattern>/SessionTrack</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            15
        </session-timeout>
    </session-config>
</web-app>

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