伺服器獲得客戶端IP地址

	public static final String getIpAddress(HttpServletRequest request) {
		// 獲取請求主機IP地址,如果通過代理進來，則透過防火牆獲取真實IP地址
		String ip = request.getHeader("X-Forwarded-For");
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			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.getHeader("HTTP_CLIENT_IP");
			}
			if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getHeader("HTTP_X_FORWARDED_FOR");
			}
			if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getRemoteAddr();
			}
			
			if ("0:0:0:0:0:0:0:1".equals(ip)) {
				ip = "127.0.0.1";
			}
		} else {
			if (ip.length() > 15) {
				String[] ips = ip.split(",");
				for (int index = 0; index < ips.length; index++) {
					String strIp = ips[index];
					if (!"unknown".equalsIgnoreCase(strIp)) {
						ip = strIp;
						break;
					}
				}
			}
		}
		return ip;
	}