How can I handle cookies?

Hi all,

I want to save the member login information in Cookies. After user login, the information will be auto-add to client side PC, and show it in FORM next time. Once I put the GETCOOKIES statement, it generated error when enter the site said that: java.lang.NullPointerException.

But, when the user logined before, this error will not be show. I know that it is the error about the Cookie, but, how can I know the cookies has data or not before get it?

here is my code:

String cookiemail="";
Cookie cookies[]=request.getCookies();

for (int i=0;i<cookies.length;i++){
if(cookies[i].getName().equals("cookiemail")){
cookiemail=cookies[i].getValue();
break;
}
}

please help. Thanks!