修改 Linux 环境下获取 Mac 地址的bug

Signed-off-by: 流放深圳 <291987541@qq.com>

licence/core/src/main/java/com/study/util/MachineAddrUtil.java

@@ -1,7 +1,8 @@
 package com.study.util;
 
-import java.net.InetAddress;
 import java.net.NetworkInterface;
+import java.util.Collections;
+import java.util.List;
 import java.util.Scanner;
 
 /**
@@ -20,13 +21,24 @@ public class MachineAddrUtil {
     public static String getMac() {
         String result = null;
         try {
-            NetworkInterface networkInterface = NetworkInterface.getByInetAddress(InetAddress.getLocalHost());
-            byte[] macByte = networkInterface.getHardwareAddress();
-            StringBuilder sb = new StringBuilder();
-            for (int i = 0; i < macByte.length; i++) {
-                sb.append(String.format("%02X%s", macByte[i], (i < macByte.length - 1) ? "-" : ""));
+            // 获取所有网络接口
+            List<NetworkInterface> networkInterfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
+            for (NetworkInterface networkInterface : networkInterfaces) {
+                // 忽略回环接口
+                if (networkInterface.isLoopback() || !networkInterface.isUp()) {
+                    continue;
+                }
+
+                byte[] macByte = networkInterface.getHardwareAddress();
+                if (macByte != null) {
+                    StringBuilder sb = new StringBuilder();
+                    for (int i = 0; i < macByte.length; i++) {
+                        sb.append(String.format("%02X%s", macByte[i], (i < macByte.length - 1) ? "-" : ""));
+                    }
+                    result = sb.toString();
+                    break; // 找到有效的MAC地址后退出循环
+                }
             }
-            result = sb.toString();
         } catch (Exception e) {
             e.printStackTrace();
         }