Solved

Cookie in JSP

Posted on 2002-04-25
4
399 Views
Last Modified: 2010-04-01
How do I set and read cookie in JSP ?
0
Comment
Question by:tanc02
  • 3
4 Comments
 
LVL 6

Expert Comment

by:kotan
ID: 6970256
To set cookie,

<%@ page import="javax.servlet.http.Cookie" %>
<%
  Cookie ck1 = new Cookie("key1", "value1");
  Cookie ck2 = new Cookie("key2", "value2");
  response.addCookie(ck1);
  response.addCookie(ck2
%>

To get back cookie,
<%@ page import="javax.servlet.http.Cookie" %>
<%
  Cookie[] ck = request.getCookies();

  for (int i = 0; i < ck.length; i++)
  {
    out.println( ck[i].getName() + ": " + ck[i].getValue() );
  }
%>
0
 
LVL 19

Accepted Solution

by:
cheekycj earned 100 total points
ID: 6971058
Kotan is right.. but IMHO to retrieve a value of a cookie it is usually better to create a method:

public static String getCookieValue(String cookieName) {
     Cookie[] theCookies = request.getCookies();
     if (theCookies != null) {
        for (int i =0; i< cookies.length; i++) {
           Cookie currentCookie = theCookies[i];
           if (currentCookie.getName().equalsIgnoreCase(cookieName)
            return currentCookie.getValue();
           }
        }
   return null;
}

so using this method you can do:
getCookieValue("testcookie");

This will check if a cookie called testcookie exists and
retrieve its value and return it.

Null is returned if the cookie does not exist.

so to use it:

String myCookieValue = getCookieValue("mycookiename");
if (myCookieValue == null) {
   // cookie does not exist
}
else {
  // cookie value exists and use it as you need.
}


I usually put the method in a utility class or something but you can put it in the JSP itself too.

CJ
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6971067
you should put the method code in <%! ... %> so it is available as a method to the entire JSP.

CJ
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6972770
Glad I could help, Thanx for the "A"
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
spring AOP 6 88
session bean client machine 9 63
parse example 13 95
iterator example remove 8 75
The advancement in technology has been a great source of betterment and empowerment for the human race, Nevertheless, this is not to say that technology doesn’t have any problems. We are bombarded with constant distractions, whether as an overload o…
In threads here at EE, each comment has a unique Identifier (ID). It is easy to get the full path for an ID via the right-click context menu. However, we often want to post a short link within a thread rather than the full link. This article shows a…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

820 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question