CookieServlet

import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import java.util.*; public class CookieServlet extends HttpServlet { //Initialize global variables public void init(ServletConfig config) throws ServletException { super.init(config); } private String getCurrentUser(String value) { String userName = new String(""); // This would normaly be a Select from a database or // other storage area. if ( value.equals("564XX892") ) { userName = new String("Bob"); } return userName; } //Process the HTTP Get request public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Get the list of Cookies stored in the request Cookie[] cookieList = request.getCookies(); String user = null; String responseString = null; if ( cookieList != null ) { // Cookies found, lets get the session id for ( int x = 0; x < cookieList.length; x++ ) { String name = cookieList[x].getName(); if ( name.equals("session_id") ) { // Get the user based on the session id user = getCurrentUser(cookieList[x].getValue()); break; } } } if ( user == null ) { // Lets create a cookie that represents a unique // session id. response.addCookie(new Cookie("session_id", "564XX892")); responseString = new String("Welcome to our site, " + "we have created a session for you."); } else { responseString = new String("Hello : " + user); } response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println(""); out.println("CookieServlet"); out.println(""); out.println(responseString); out.println(""); out.close(); } //Get Servlet information public String getServletInfo() { return "CookieServlet Information"; } }