Dealing with JSP Cookies

Cookies

Cookies are text files stored on the client computer and they are kept for various information tracking purpose.

Cookies can be set , read and deleted by a programer by following below simple steps:

Setting Cookies 

           Setting cookies with JSP involves three steps:

• Creating a Cookie object 

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

•  Setting the maximum age 

                     cookie.setMaxAge(60*60*24);

•  Sending the Cookie into the HTTP response headers

                      response.addCookie(cookie); 

Reading Cookies

• To read cookies, you need to create an array of javax.servlet.http.Cookie objects by calling the getCookies( ) method of HttpServletRequest. 

Deleting Cookies

• deleting cookies is very simple. If you want to delete a cookie then you simply need to follow up following three steps:
• Read an already existing cookie and store it in Cookie object.
• Set cookie age as zero using setMaxAge() method to delete an existing cookie.
• Add this cookie back into response