Java Servlet Programing Laungage

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
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_3_0.xsd">
 <servlet>
  <servlet-name>CookieServlet</servlet-name>
  <servlet-class>r4r.servlet.CookieServlet</servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>CookieServlet</servlet-name>
  <url-pattern>/CookieServlet</url-pattern>
 </servlet-mapping>
 <session-config>
  <session-timeout>
   30
  </session-timeout>
 </session-config>
</web-app>

Index.jsp

<%-- 
 Document   : index.jsp
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
 <head>
  <meta http-equiv="Content-Type" 
         content="text/html; charset=UTF-8">
  <title>r4r.co.in-servlet</title>
 </head> 
 <body>
  <form>
  <h1>Access Servlet by servlet's Name!</h1>
  <a href="CookieServlet">CookieServlet</a>
  </form>
</body>
</html>

Servlet Program

/*
 * Save as a CookieServlet.java
 */
package r4r.servlet;
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;
/**
 *
 * @author R4R
 */
public class CookieServlet extends HttpServlet {
private Cookie cookie;

protected void processRequest(HttpServletRequest request,
	  HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
/* TODO output your page here */
out.println("<html>");
out.println("<head>");
out.println("<title>" + getServletInfo() + "</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet CookieServlet at " 
	       + request.getContextPath() + "</h1>");
out.println("<form name=\"form\"action=\
            "CookieServlet\" method=\"POST\">");
out.println("<BR>Username:");
out.println("<input type=\"text\" name=\
                   "user\" value=\"\" size=\"20\" />");
out.println("<BR>Password :");
out.println("<input type=\"password\" name=\
            "pass\" value=\"\" size=\"20\" />");
out.println("<BR> <input type=\"submit\" value=\
            "Submit Form\" name=\"submit\" />");
out.println("<input type=\"reset\" value=\"Reset \" />");
out.println("</form>");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}

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

@Override
protected void doPost(HttpServletRequest request,
 HttpServletResponse response)
throws ServletException, IOException {
// processRequest(request, response);
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
// get value form TextField
String username = request.getParameter("user");
String password = request.getParameter("pass");
// User don't allow to leave any textfield empty
if ((!username.equals("") && (!password.equals("")))) {
String cookieValue = username + " " + password;
cookie = new Cookie("cookiee", cookieValue); // initialize cookie
cookie.setMaxAge(100);                                             
// set cookie max age
cookie.setVersion(1);                                               
// set cookie version
response.addCookie(cookie);
out.println("<html>");
out.println("<head>");
out.println("<title>" + getServletInfo() + "</title>");
out.println("</head>");
out.println("<body>");
// retrive cookiee value and display cookiee information
out.println("<b>Data successfully add into cookiee</b>");
out.println("<br>Cookiee Name: " + cookie.getName());
out.println("<br>Cookiee Value : " + cookie.getValue());
out.println("<br>Cookiee Version : " + cookie.getVersion());
out.println("</body>");
out.println("</html>");
} else {
out.println("Please don't leave any textfield empty!");
out.println("<BR><a href=\"CookieServlet\">Return to home Page</a>");
}
out.close(); //close text-output stream
}

@Override
public String getServletInfo() {
return "r4r.co.in-CookieServlet";
}
}