SessionToCookieFilter.java 文件源码

/**
 * returns the cookie corresponding to {@link #getSessionDataCookieName()},
 * if it exists. Null otherwise.
 * 
 * @param httpServletRequest
 * @return
 */
protected Cookie retrieveSessionDataCookie(HttpServletRequest httpServletRequest) {
    Cookie[] cookies = httpServletRequest.getCookies();
    if (cookies != null) {
        for (Cookie cookie : cookies) {
            if (getSessionDataCookieName().equals(cookie.getName())) {
                return cookie;
            }
        }
    }
    return null;
}