SpringBoot获取真实的客户端IP地址

SpringBoot获取真实的客户端IP地址的代码如下：

private static final String IP_UTILS_FLAG = ",";
private static final String UNKNOWN = "unknown";
private static final String LOCALHOST_IP = "0:0:0:0:0:0:0:1";
private static final String LOCALHOST_IP1 = "127.0.0.1";


/**
 * 获取IP地址
 * 
 * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
 * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
 */
public static String getIpAddr(HttpServletRequest request) {
	String ip = null;
	try {
		//以下两个获取在k8s中，将真实的客户端IP，放到了x-Original-Forwarded-For。而将WAF的回源地址放到了 x-Forwarded-For了。
		ip = request.getHeader("X-Original-Forwarded-For");
		if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
			ip = request.getHeader("X-Forwarded-For");
		}
		//获取nginx等代理的ip
		if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
			ip = request.getHeader("x-forwarded-for");
		}
		if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		}
		if (StringUtils.isEmpty(ip) || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
		}
		if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
			ip = request.getHeader("HTTP_CLIENT_IP");
		}
		if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
			ip = request.getHeader("HTTP_X_FORWARDED_FOR");
		}
		//兼容k8s集群获取ip
		if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
			if (LOCALHOST_IP1.equalsIgnoreCase(ip) || LOCALHOST_IP.equalsIgnoreCase(ip)) {
				//根据网卡取本机配置的IP
				InetAddress iNet = null;
				try {
					iNet = InetAddress.getLocalHost();
				} catch (UnknownHostException e) {
//                        logger.error("getClientIp error: {}", e);
				}
				ip = iNet.getHostAddress();
			}
		}
	} catch (Exception e) {
		e.printStackTrace();
	}
	//使用代理，则获取第一个IP地址
	if (!StringUtils.isEmpty(ip) && ip.indexOf(IP_UTILS_FLAG) > 0) {
		ip = ip.substring(0, ip.indexOf(IP_UTILS_FLAG));
	}

	return ip;
}