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

-

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>

Comments

Post a Comment

Popular posts from this blog

Write a program to check whether empty query string is entered in Asp.Net.

-
Image
Take an one web Page give any Suitable name as you want. Here Page taken with the name of Default1.aspx Page1: Default1.aspx Design: <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server">     <title></title> </head> <body>     <form id="form1" runat="server">     <div>         <br />         <asp:TextBox ID="txtUserid" runat="server"></asp:TextBox>         <br />          <asp:Button ID="QuerySend" runat="server" onclick="QuerySend_Click" Text="Send"/>     </div>     </form> </body> </html> Code:- using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class Default1 : System.Web.UI.Page {     protected void Page_
Read more

Mandavrayji Temple, Muli, Surendranagar, Gujarat

-
Image
There is a temple of Almighty sun called “Mandavrayji mandir” ,which is also the spiritual center and “Ishtdev” of Parmar Kshatriya Rajputs . It is said that one of the Parmar King Sachoji was a big donor and worshiper of MandavrayjiDada .He has a rule of giving any thing which is asked to him. Once he was being asked to give a lion alive and by the help of MandavrayjiDada he was able to give that lion alive till today this fact is so much popular in Muli village. Its really great place to visit..
Read more

Write a program to change color of Label text control programmatically in Asp.Net.

-
Image
Design: <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server">     <title></title> </head> <body>     <form id="form1" runat="server">     <div>    <asp:Label ID="lboutput" runat="server" Text="Welcome in Code Solution "></asp:Label>         <br />    <asp:Button ID="btnred" runat="server" Text="" BackColor="Red" onclick="btnred_Click" />         &nbsp;&nbsp;    <asp:Button ID="btnblue" runat="server" Text="" BackColor="Blue" onclick="btnblue_Click" />         &nbsp;&nbsp;     <asp:Button ID="btngreen" runat="server" Text="" BackColor="Green" onclick="btngreen_Click" />     </div>     </form> </body> &l
Read more