Java 获取本地ip网卡信息

工具类

  public static Optional<Inet4Address> getLocalIp4Address() throws SocketException {
        final List<Inet4Address> inet4Addresses = getLocalIp4AddressFromNetworkInterface();
        if (inet4Addresses.size() != 1) {
            final Optional<Inet4Address> ipBySocketOpt = getIpBySocket();
            if (ipBySocketOpt.isPresent()) {
                return ipBySocketOpt;
            } else {
                return inet4Addresses.isEmpty() ? Optional.empty() : Optional.of(inet4Addresses.get(0));
            }
        }
        return Optional.of(inet4Addresses.get(0));
    }

    private static Optional<Inet4Address> getIpBySocket() throws SocketException {
        try (final DatagramSocket socket = new DatagramSocket()) {
            socket.connect(InetAddress.getByName("8.8.8.8"), 10002);
            if (socket.getLocalAddress() instanceof Inet4Address) {
                return Optional.of((Inet4Address) socket.getLocalAddress());
            }
        } catch (UnknownHostException networkInterfaces) {
            throw new RuntimeException(networkInterfaces);
        }
        return Optional.empty();
    }


    public static List<Inet4Address> getLocalIp4AddressFromNetworkInterface() throws SocketException {
        List<Inet4Address> addresses = new ArrayList<>(1);

        // 所有网络接口信息
        Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
        if (Objects.isNull(networkInterfaces)) {
            return addresses;
        }
        while (networkInterfaces.hasMoreElements()) {
            NetworkInterface networkInterface = networkInterfaces.nextElement();
            //滤回环网卡、点对点网卡、非活动网卡、虚拟网卡并要求网卡名字是eth或ens开头
            if (!isValidInterface(networkInterface)) {
                continue;
            }

            // 所有网络接口的IP地址信息
            Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses();
            while (inetAddresses.hasMoreElements()) {
                InetAddress inetAddress = inetAddresses.nextElement();
                // 判断是否是IPv4，并且内网地址并过滤回环地址.
                if (isValidAddress(inetAddress)) {
                    addresses.add((Inet4Address) inetAddress);
                }
            }
        }
        return addresses;
    }

    private static boolean isValidAddress(InetAddress address) {
        return address instanceof Inet4Address && address.isSiteLocalAddress() && !address.isLoopbackAddress();
    }

    /**
     * 过滤回环网卡、点对点网卡、非活动网卡、虚拟网卡并要求网卡名字是eth或ens开头
     *
     * @param ni 网卡
     * @return 如果满足要求则true，否则false
     */
    private static boolean isValidInterface(NetworkInterface ni) throws SocketException {
        return !ni.isLoopback() && !ni.isPointToPoint() && ni.isUp() && !ni.isVirtual() && (ni.getName().startsWith("eth") || ni.getName().startsWith("ens"));
    }
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获取本机ip

getLocalIp4Address().get().getHostAddress()
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