【转载】Java 获取 k8s 系统获取真实客户端 IP

转自：https://www.likecs.com/show-123200.html

总的概括来说获取IP的时候需要考虑的一下几点：

1、nginx等代理的IP

2、K8s中的IP

3、使用代理的情况

具体代码如下：

{
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) {
log.error("getClientIp error: {}", e);
}
ip = iNet.getHostAddress();
}
}
} catch (Exception e) {
log.error("IPUtils ERROR ", e);
}
//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;
}