How can i delete or set max duration for which Cookie exists?

You can set the maximum age of a cookie with the cookie.setMaxAge(int seconds) method: Here are different options to this method,

Zero means to delete the cookie
A positive value is the maximum number of seconds the cookie will live, before it expires
A negative value means the cookie will not be stored beyond this browser session (deleted on browser close)
Here is a sample code to delete cookie.

private void deleteCookie(String cookieName)
{
Cookie[] cookies =request.getCookies();

if (cookies != null)
{
for (int i=0; i {
if (cookies[i].getName().equals(cookieName));
cookies[i].setMaxAge(0);
}
}
}