Cookie的一些细节

       The browser isexpected to support 20 cookies for each Web server, 300 cookies total, and maylimit cookie size to 4 KB each.Several cookies might have the same name butdifferent path attributes.

About the method ofCookie:

      (1.setPath(String)

      The cookie isvisible to all the pages in the directory you specify, and all the pages inthat directory's subdirectories. A cookie's path must include the servlet thatset the cookie, for example, /catalog, which makes the cookie visible to alldirectories on the server under /catalog.

      (2.setMaxAge(int)

     A negative valuemeans that the cookie is not stored persistently and will be deleted when theWeb browser exits. A zero value causes the cookie to be deleted.

      For instance:Demo3/servlet/Timecookie  AND  Demo3/servlet/DeletCookie.