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public static String getIpAddress(ServerHttpRequest request) {
    HttpHeaders headers = request.getHeaders();
    String ip = headers.getFirst("x-forwarded-for");
    if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
        // 多次反向代理后会有多个ip值，第一个ip才是真实ip
        if (ip.indexOf(",") != -1) {
            ip = ip.split(",")[0];
        }
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = headers.getFirst("Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = headers.getFirst("WL-Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = headers.getFirst("HTTP_CLIENT_IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = headers.getFirst("HTTP_X_FORWARDED_FOR");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = headers.getFirst("X-Real-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getRemoteAddress().getAddress().getHostAddress();
    }
    return ip;
}
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原文链接：https://blog.csdn.net/qq_16511223/article/details/95592633