public static String getIpAddr(HttpServletRequest request) {
		if (null == request) {
			return null;
		}

		String proxs[] = { "X-Forwarded-For", "Proxy-Client-IP",
				"WL-Proxy-Client-IP", "HTTP_CLIENT_IP", "HTTP_X_FORWARDED_FOR" };

		String ip = null;

		for (String prox : proxs) {
			ip = request.getHeader(prox);
			if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
				continue;
			} else {
				break;
			}
		}

		if (StringUtils.isBlank(ip)) {
			return request.getRemoteAddr();
		}

		return ip;
	}