Ex-12 (b) Creating and Managing Cookies using Servlet

Web Application using Cookies for Session Handling

The Client (Cookie.html):

<html>

<head>

<title>Session Handling using Session Objects</title>

</head>

<body>

<h2>User Login</h2>

User Name : <input type="text" name="user" /><br/>

Passowrd: <input type="password" name = "pass" /> <br/>

Click here to Send Request -->

</form>

</body>

</html>

Servlet-1 (Validate.java):

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class Validate extends HttpServlet

{

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

{

        response.setContentType("text/html; charset=UTF-8");

        PrintWriter out = response.getWriter();

        String uName = request.getParameter("user");

        String pWord = request.getParameter("pass");

        if(pass.equal("1234"))

{

            Cookie ck = new Cookie("userName", uName);

            response.addCookie(ck);

            response.sendRedirect("welcomUser");

}

        else

{

            out.println("The Password is not Correct...");

}

}

}

Servlet-2 (Welcome.java):

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class Welcome extends HttpServlet

{

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

{

        response.setContentType("text/html; charset=UTF-8");

        PrintWriter out = response.getWriter();

        Cookies cks[] = request.getCookies();

        String user = cks[0].getValue();

        out.println("Hello " + user);

}

}

Web Descriptor (web.xml):

<web-app>

<servlet-name>validateUser</servlet-name>

<servlet-class>Validate</servlet-class>

</servlet>

<servlet-name>welcomeUser</servlet-name>

<servlet-class>Welcome</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>validateUser</servlet-name>

<url-pattern>/validatUser</url-pattern>

</servlet-mapping>

<servlet-mapping>

<servlet-name>welcomeUser</servlet-name>

<url-pattern>/welcomUser</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>Cookie.html</welcome-file>

</welcome-file-list>

</web-app>

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