Question

iam having a jsp page Index.jsp which accept a only unicode string as its parameter and submit the form to Result.jsp. I need to maintain the cookie for the string entered by the user each time user enter the new string cookie value would be changed i have wriiten following code

In Index.jsp i have crated the Cookie

<%
        Cookie ck= new Cookie("DNString",";");
        response.addCookie(ck);
%> 

and in the servlet i am trying to manage and set the cookie value each tim euser submits the form

private void fnSetCookieValues(HttpServletRequest request,HttpServletResponse response) 
    {

        Cookie[] cookies=request.getCookies();
        for (int i = 0; i < cookies.length; i++) {

            System.out.println(""+cookies.length+"Name"+cookies[i].getName());
            if(cookies[i].getName().equals("DNString"))
            {   
                System.out.println("Inside if:: "+cookies[i].getValue()+""+cookies.length);
                cookies[i].setValue(request.getParameter("txtIIDN"));
            }
        }

    }

but the problem is that while getCookie() it doesnt give the DNString as the cookie but only shows 1NameJSESSIONID as System.out.println(“”+cookies.length+”Name”+cookies[i].getName()); statement output

but while looking througn browser like

it shows DNString as a cookie stored

can anyone figure out the problem and possible solution for it.

Thanks

Answer 1

The problem might be because of ; being the delimiter of cookie parameters.

The value ";" added for the first time goes to the client with response header like this:

HTTP/1.1 200 OK
Server: tomcat
Set-Cookie: DNSString=;;JSESSIONID=some-id-value
...
...

The client sends back the cookie in the next request like this:

GET /someurl Http/1.1
Host: server.com
Cookie: DNSString=;;JSESSIONID=some-id-value

I think somewhere the parsing is failing because the value itself is delimiter.