/*
* Understanding the
basic creation of cookie in Servlet
* setting the max age
of the cookie
* Insreting the cookie
into the response header
*/
/*
* this program lets a
user to login when he visits the site for the first time
* on his subsequent
visits the site displays the visit number of the user untill the user clears
the cookie.
* Note that for login
this program dont use any validation or authentication,
* For the first visit
of the user it creates a cookie and retrieves the information from that cookie.
*/
package CookieLoginPkg;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet
implementation class CookieLoginCls
*/
@WebServlet("/CookieLoginCls")
public class CookieLoginCls extends HttpServlet
{
Cookie c=null;
private static
final long serialVersionUID = 1L;
/**
* @see
HttpServlet#HttpServlet()
*/
public
CookieLoginCls() {
super();
// TODO
Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest
request, HttpServletResponse response)
*/
protected void
doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException
{
PrintWriter
pw=response.getWriter();
Cookie
arr[]=request.getCookies();
//pw.println(arr);
if(arr==null
&& request.getParameter("username")==null)
{
/*
* here we need to give the user the login page
*/
String
str= "<html>"+
"<body>"+
"<h1><marquee>Login
Form</marquee></h1>"+
"<form
action=\"CookieLoginCls\">"+
"<table
align=\"center\">"+
"<tr>"+
"<td>Login</td>"+
"<td><input
type=\"text\" name=\"username\"></td>"+
"</tr>"+
"<tr>"+
"<td>Passoword</td>"+
"<td><input
type=\"password\" name=\"password\"></td>"+
"</tr>"+
"<tr>"+
"<td
><input type=\"submit\"></td>"+
"</tr>"+
"</table>"+
"</form>"+
"</body>"+
"</html>";
pw.println(str);
}
else
if(request.getParameter("username")!=null)
{
c=new
Cookie("login",request.getParameter("username")+"-"+request.getParameter("password"));
c.setMaxAge(60*60*24*7);
response.addCookie(c);
c=new
Cookie("cnt","1");
c.setMaxAge(60*60*24*7);
response.addCookie(c);
pw.println("cookie
created successfully");
}
else
{
String
val="";
for(Cookie
co:arr)
if(co.getName().equals("cnt"))
val=c.getValue();
String
str= "<html>"+
"<body>"+
"<h1>"+
"Cookie
is created and the user has logged in automatically"+
"<br>"+
"<br>"+
"Visit
Number = "+val+
"</h1>"+
"</body>"+
"</html>";
pw.println(str);
c=new
Cookie("cnt",""+(Integer.parseInt(val)+1));
c.setMaxAge(60*60*24*7);
response.addCookie(c);
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest
request, HttpServletResponse response)
*/
protected void
doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
// TODO
Auto-generated method stub
}
}
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