java打印以太网mac地址

Question

您好，我正在尝试打印计算机的以太网 MAC 地址，但我不确定如何更改我的代码以打印无线局域网地址，我在 google 上找不到任何信息。

public void getMacAddress(){
    InetAddress ip;
    try {
        ip = InetAddress.getLocalHost();
        NetworkInterface network = NetworkInterface.getByInetAddress(ip);
        byte[] mac = network.getHardwareAddress();
        System.out.print("Current MAC address : ");
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < mac.length; i++) {
            sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));        
        }
        System.out.println(sb.toString());
    } catch (UnknownHostException e) {
        e.printStackTrace();
    } catch (SocketException e){
        e.printStackTrace();
    }
}

我正在寻找打印以太网适配器本地连接：而不是 无线 LAN 适配器 无线网络连接 3：

Answer 1

您可以尝试打印所有接口：

public static void printInterfaces() {
    Enumeration<NetworkInterface> networkInterfaces;
    try {
        networkInterfaces = NetworkInterface.getNetworkInterfaces();
        Collections.list(networkInterfaces).forEach(networkInterface -> {

            try {
                StringBuilder sb = new StringBuilder();
                if (networkInterface.getHardwareAddress() != null) {
                    byte[] mac = networkInterface.getHardwareAddress();
                    for (int i = 0; i < mac.length; i++) {
                        sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
                    }
                } else {
                    sb.append("Interface has no MAC");
                }
                System.out.println(
                        String.format("Interface: %s  MAC: %s", networkInterface.getDisplayName(), sb.toString()));
            } catch (SocketException e) {
                e.printStackTrace();
            }
        });
    } catch (SocketException e1) {
        e1.printStackTrace();
    }
}

在我的 OSX 盒子上打印：

Interface: awdl0  MAC: 16-D0-14-AA-AA-AA
Interface: vboxnet0  MAC: 0A-00-27-00-00-00
Interface: en1  MAC: A8-86-DD-AA-AA-AA
Interface: en0  MAC: 68-5B-35-AA-AA-AA
Interface: lo0  MAC: Interface has no MAC

Answer 2

您可以获取所有网络接口并循环访问它们。如果您只是在寻找物理网络适配器，您可以根据它们是否具有 MAC 地址来过滤它们。

public static void main(String[] args) throws SocketException {
    Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
    while (networkInterfaces.hasMoreElements()) {
        NetworkInterface networkInterface = networkInterfaces.nextElement();
        System.out.printf("%s with %s%n", networkInterface.getDisplayName(),
                macString(networkInterface).orElse("no hardware address"));
    }
}

/**
 * Gets the hardware address of a {@link NetworkInterface} in the format
 * {@code AA-BB-CC-DD-EE-FF}.
 *
 * @param iface The interface to get the MAC address string of.
 * @return A optional containing the string representation. This optional will
 * be empty if the network interface does not have a hardware address (virtual adapters like
 * loopback devices).
 * @throws SocketException If an I/O error occurs when getting the hardware address from the interface.
 */
private static Optional<String> macString(NetworkInterface iface) throws SocketException {
    byte[] mac = iface.getHardwareAddress();
    if (mac == null) {
        return Optional.empty();
    }
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < mac.length; i++) {
        sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
    }
    return Optional.of(sb.toString());
}

为我打印：

tun0 with no hardware address
eth0 with AE-50-74-CC-73-ED
lo with no hardware address