How to use cookies in jsp

Hi all,
I'm new to jsp, please let me know how to use cookies with jsp.
I have three web applications, in run time I have to switch from one application to another application based on single login page. I have taught cookies are one of the solution. But while I'm googling I unable to get such a good material.
please give some examples,
Thanks in advance.
achchayya

Read a cookie in jsp
HttpSession session = request.getSession();
Cookie cookie_session = getCookie(request, "COOKIENAME");
          if (cookie_session == null) {
               sesID = session.getId();
          } else {
               sesID = cookie_session.getValue();
          }or
get all cookie in the browser
This gets all the cookies and according to the cookie name given u can get the cookie value
Cookie[] cookies = request.getCookies();
          if (cookies != null) {
               for (int i = 0; i < cookies.length; i++) {
                    if (cookies.getName().equals(cookieName))
                         return cookies[i];
               }but i am not sure if this works for ur requirement try and see

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