Java cookie usage (read, set, delete)

1. Set Cookie

Cookie cookie = new Cookie ("key", "value ");

Cookie. setMaxAge (60 );

Set the 60-second lifetime. If it is set to a negative value, it is the browser process Cookie (saved in memory). If it is disabled, the browser becomes invalid.

Cookie. setPath ("/test/test2 ");

Set the Cookie path. If not set, it is the current path (for Servlet, it is the url-pattern path part of the Servlet configured in request. getContextPath () + web. xml ).

Instance

The code is as follows:

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Response. addCookie (cookie ); Public static void setCookie (HttpServletResponse response, String name, String value, String path ){ If (logger. isDebugEnabled ()){ Logger. debug ("Setting cookie '" name "'on path'" path "'"); } Cookie cookie = new Cookie (name, value ); Cookie. setSecure (false ); Cookie. setPath (path ); Cookie. setMaxAge (Constants. COOKIE_INVALID_TIME ); Response. addCookie (cookie ); // Logger.info ("setCookie completed ...... "); }

2. Read Cookie

This method can read all Cookie objects in the current path and "direct parent path". If no Cookie exists, null is returned.

Cookie [] cookies = request. getCookies ();

3. Delete a Cookie

The code is as follows:	Copy code
Cookie cookie = new Cookie ("key", null ); Cookie. setMaxAge (0 );

    
Instance

The code is as follows:

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Public static void clearCookie (HttpServletRequest request, HttpServletResponse response, String path ){ Cookie [] cookies = request. getCookies (); Try { For (int I = 0; I <cookies. length; I ){ // System. out. println (cookies [I]. getName () ":" cookies [I]. getValue ()); Cookie cookie = new Cookie (cookies [I]. getName (), null ); Cookie. setMaxAge (0 ); Cookie. setPath (path); // enter the cookie name based on the path you created. Response. addCookie (cookie ); } } Catch (Exception ex ){ System. out. println ("An error occurred while deleting Cookies! "); } }

Set 0 to delete the Cookie immediately;

The code is as follows:	Copy code
Cookie. setPath ("/test/test2 ");

Delete the Cookie in the specified path. If this path is not set, the Cookie in the current path is deleted by default;

The code is as follows:	Copy code
Response. addCookie (cookie );

Cookie call operation?

// Call

The code is as follows:	Copy code
String cookiename = "vbo "; String cookievalue = "cb "; String path = "/"; SetCookie (response, cookiename, cookievalue, path ); ClearCookie (request, response, path );//