Java operation of Cookies

Write cookies:

Cookie cookie = new Cookie (constants.cookie4sessionname, Session.getsessionid ()); Cookie.setpath ("/");//Set Root path Cookie.setdomain (". baidu.com");//set access domain, primary domain and subdomain can share cookies or set cross-domain cookie Cookie.setmax        Age (Constants.defaultcookiesessionage * 24 * 3600); Response.addcookie (cookie);

Note: To delete a cookie, set MaxAge to 0, and specify path and domain (if not default, the path and sub-path of the default path is the Write cookie, the default domain is the full name), the modification is similar, there is no explicit modification and deletion, The essence is coverage and timeout invalidation.

Cookie.setpath ("/");        Cookie.setdomain (". baidu.com"); Cookie.setmaxage (0);

Read cookies:

public static String GetSessionID (HttpServletRequest request) {cookie[] cookies = request.getcookies ();        if (null = = Cookie | | cookies.length = = 0) return null; for (Cookie cookie:cookies) {if (Constants.cookie4SessionName.equals (Cookie.getname ())) {return            Cookie.getvalue ();    }} return null; }

Of course, the Cookie can be encapsulated into a cookiemap using more convenient, map<string, cookie> cookiemap ...

A bit of a headache is that when the cookie is obtained, if the root domain and the whole domain are set a key value pair, the domain information is not available, you can first delete the unwanted domain cookie.

Java operation of Cookies