在Java中获取Linux系统的MAC地址

在Java中获取Linux系统的MAC地址有几种方法,以下是几种常用的实现方式：

方法1：使用NetworkInterface类（推荐）

import java.net.NetworkInterface;
import java.util.Collections;
import java.util.Enumeration;
public class GetMacAddress {
    public static void main(String[] args) {
        try {
            Enumeration<NetworkInterface> networks = NetworkInterface.getNetworkInterfaces();
            for (NetworkInterface network : Collections.list(networks)) {
                byte[] mac = network.getHardwareAddress();
                if (mac != null && mac.length > 0) {
                    StringBuilder sb = new StringBuilder();
                    for (byte b : mac) {
                        sb.append(String.format("%02X:", b));
                    }
                    if (sb.length() > 0) {
                        sb.deleteCharAt(sb.length() - 1); // 移除最后的冒号
                    }
                    System.out.println("Interface: " + network.getName() + 
                                     " Display Name: " + network.getDisplayName() + 
                                     " MAC: " + sb.toString());
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

方法2：执行Linux命令获取MAC地址

import java.io.BufferedReader;
import java.io.InputStreamReader;
public class GetMacAddressLinux {
    public static void main(String[] args) {
        try {
            Process process = Runtime.getRuntime().exec("ifconfig");
            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                if (line.contains("HWaddr") || line.contains("ether")) {
                    // 处理不同Linux发行版的输出格式
                    String[] parts = line.split("\\s+");
                    for (String part : parts) {
                        if (part.matches("([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})")) {
                            System.out.println("MAC Address: " + part);
                            break;
                        }
                    }
                }
            }
            process.waitFor();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

方法3：使用ip命令（现代Linux系统）

import java.io.BufferedReader;
import java.io.InputStreamReader;
public class GetMacAddressIpCommand {
    public static void main(String[] args) {
        try {
            Process process = Runtime.getRuntime().exec("ip link show");
            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                if (line.contains("link/ether")) {
                    String[] parts = line.split("\\s+");
                    for (String part : parts) {
                        if (part.matches("([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})")) {
                            System.out.println("MAC Address: " + part);
                            break;
                        }
                    }
                }
            }
            process.waitFor();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

注意事项

1. 权限问题：某些方法可能需要root权限才能获取所有网络接口的信息
2. 虚拟接口：上述方法可能会返回虚拟网络接口（如docker0、virbr0等）的MAC地址，你可能需要过滤掉这些
3. 多网卡系统：服务器可能有多个网卡，你需要确定获取的是哪个网卡的MAC地址
4. Java安全策略：如果运行在受限环境中，可能需要调整Java安全策略

过滤特定网卡的示例

如果你只想获取特定网卡（如eth0）的MAC地址：

import java.net.NetworkInterface;
public class GetSpecificMac {
    public static void main(String[] args) {
        try {
            NetworkInterface network = NetworkInterface.getByName("eth0");
            if (network != null) {
                byte[] mac = network.getHardwareAddress();
                if (mac != null) {
                    StringBuilder sb = new StringBuilder();
                    for (byte b : mac) {
                        sb.append(String.format("%02X:", b));
                    }
                    if (sb.length() > 0) {
                        sb.deleteCharAt(sb.length() - 1);
                    }
                    System.out.println("eth0 MAC: " + sb.toString());
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

选择哪种方法取决于你的具体需求和运行环境。NetworkInterface方法是最推荐的，因为它不依赖外部命令且跨平台性更好。