http://wenku.baidu.com/view/f39604e59b89680203d82514.html
/** * 获取客户端真实IP * 如果通过了多级反向代理的话,X-Forwarded-For的值并不止一个,而是一串IP值, * 那么真正的用户端的真实IP则是取X-Forwarded-For中第一个非unknown的有效IP字符串。 * @method: getClientIpAddr * @param request * @return String * @createDate: 2017年1月20日 * @2017, by Kelvin. */ public static String getClientIpAddr(HttpServletRequest request) { String ip = request.getHeader("x-forwarded-for"); if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("Proxy-Client-IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("WL-Proxy-Client-IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getRemoteAddr(); } return ip; }