code: public static Cookie getCookie (HttpServletRequest req, String name)
      {
          Cookie[] cookies = req.getCookies();
          if (cookies != null) {
              for (int ii=0, nn=cookies.length; ii < nn; ii++) {
                  if (cookies[ii].getName().equals(name)) {
                      return cookies[ii];
                  }
              }
          }
  
          return null; // not found
      }
docs: Get the cookie of the specified name, or null if not found.