Practical 23: Write a program to create Session using HttpSession class ~ Coding Atharva

First.java:

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

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


public class First extends HttpServlet {

 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

 doPost(request, response);
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

  response.setContentType("text/html");
  PrintWriter out = response.getWriter();
  out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
  out.println("<HTML>");
  out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
  out.println("  <BODY>");

  
  String  name=request.getParameter("uname");
  String  pwd=request.getParameter("pwd");
  HttpSession  session=request.getSession();
  session.setMaxInactiveInterval(10);
  if(name.equals("atharva")&&(pwd.equals("agrawal")))
  {
   
   out.println("<h1> Login Success ");
   out.println("Session id is :"+session.getId());
   out.println("Session CT is :"+session.getCreationTime());
   out.println("Session Interval time is :"+session.getMaxInactiveInterval());
   
   
   session.setAttribute("userattr",name);
   out.println("<a href='Second'> Go for Next servlet...</a>");
   
  }
  else
  {
   
   out.println("<h1> Login Fails ");
   RequestDispatcher rd=request.getRequestDispatcher("/MyHtml.html");
   rd.include(request, response);
  }
  
  out.println("  </BODY>");
  out.println("</HTML>");
  out.flush();
  out.close();
 }

}

SecondApp.java:

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

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


public class SecondApp extends HttpServlet {

 
 public void service(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

  response.setContentType("text/html");
  PrintWriter out = response.getWriter();
  out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
  out.println("<HTML>");
  out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
  out.println("  <BODY>");
  
  HttpSession  session=request.getSession();
  
  out.println("<h3> Session ID is "+session.getId());
  
  String fetchname=(String) session.getAttribute("userattr");
  
  
  if(fetchname!=null)
  {
  out.println(" <h1><b>  Name is :"+fetchname);
  }
  else
  {
   out.println(" <h2> Session Expires , please login again");
   out.println("<a href='/MyHtml.html'> Go for Home page...</a>");
  }
  out.println("  </BODY>");
  out.println("</HTML>");
  out.flush();
  out.close();
 }


}

Web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
 xmlns="http://java.sun.com/xml/ns/javaee" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>First</servlet-name>
    <servlet-class>First</servlet-class>
  </servlet>
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>SecondApp</servlet-name>
    <servlet-class>SecondApp</servlet-class>
  </servlet>


  <servlet-mapping>
    <servlet-name>First</servlet-name>
    <url-pattern>/First</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>SecondApp</servlet-name>
    <url-pattern>/Second</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>MyHtml.html</welcome-file>
  </welcome-file-list>
</web-app>

MyHtml.html:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>MyHtml.html</title>
 
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
    
    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

  </head>
  
  <body>
   <form action="./First"  method="post">
   <center><h1><u>Session Programming example</u><br/></h1>
   <h2>
   
  Username: <input type="text"  name="uname"/><br/>
  password : <input type="password" name="pwd"><br/>
   <input type="submit" name="Click" value="click here">
   </h2>
   </center>
   </form>
  </body>
</html>

Practical 23: Write a program to create Session using HttpSession class

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