code: public final static Map<String, Cookie> readCookieMap(HttpServletRequest httpServletRequest) {
  		Map<String, Cookie> cookieMap = new HashMap<String, Cookie>();
  		Cookie[] cookies = httpServletRequest.getCookies();
  		if (null == cookies) {
  			return null;
  		}
  		for (Cookie cookie : cookies) {
  			cookieMap.put(cookie.getName().toLowerCase(), cookie);
  		}
  		return cookieMap;
  	}
docs: 将cookie封装到Map里面
  
  @param httpServletRequest {@link HttpServletRequest}
  @return Cookie map