In GWT you can work easily with cookies. GWT has a class that name is Cookies , with this class you can set your values into browser cookie mechanism or get values from browser cookie this class has several static method for this purposes.
Cookies.setCookie(cookieName, cookieValue, expires);
With the above method you can set your value into browser cookie with a cookie name. you can also set a timeout for your cookie in milliseconds (expire time).
You can remove your set cookie with the removeCookie method.
With the following method you can get the list of all set cookie.
and finally you can get a spesific cookie with the following method.
have a nice time.