JAVA--nginx代理后獲取ip地址以及本地獲取mac地址

nginx代理后獲取IP地址，確保nginx里的設置允許頭信息傳遞
　參數 x-forward-for

public static String getIp2(HttpServletRequest request) {
    String ip = request.getHeader("x-forwarded-for");
    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();
    }
    return ip;
}

public static List<String> getMacList() throws Exception {
    java.util.Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();
    StringBuilder sb = new StringBuilder();
    ArrayList<String> tmpMacList=new ArrayList<>();
    while(en.hasMoreElements()){
        NetworkInterface iface = en.nextElement();
        List<InterfaceAddress> addrs = iface.getInterfaceAddresses();
        for(InterfaceAddress addr : addrs) {
            InetAddress ip = addr.getAddress();
            NetworkInterface network = NetworkInterface.getByInetAddress(ip);
            if(network==null){continue;}
            byte[] mac = network.getHardwareAddress();
            if(mac==null){continue;}
            sb.delete( 0, sb.length() );
            for (int i = 0; i < mac.length; i++) {sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));}
            tmpMacList.add(sb.toString());
        }        }
    if(tmpMacList.size()<=0){return tmpMacList;}
    /***去重，別忘了同一個網卡的ipv4,ipv6得到的mac都是一樣的，肯定有重復，下面這段代碼是。。流式處理***/
    List<String> unique = tmpMacList.stream().distinct().collect(Collectors.toList());
    return unique;
}