獲取請求地址

/**
	 * 獲取客戶端IP
	 * @param request
	 * @return
	 */
	private String getRemoteAddr(HttpServletRequest request) {
		String ip = request.getHeader("X-Real-IP");
		if (!StringUtils.isBlank(ip) && !"unknown".equalsIgnoreCase(ip)) {
			return ip;
		}
		ip = request.getHeader("X-Forwarded-For");
		if (!StringUtils.isBlank(ip) && !"unknown".equalsIgnoreCase(ip)) {
			// 屢次反向代理後會有多個IP值，第一個爲真實IP。
			int index = ip.indexOf(',');
			if (index != -1) {
				return ip.substring(0, index);
			} else {
				return ip;
			}
		} else {
			return request.getRemoteAddr();
		}
	}