新增获取网卡IP地址方法

hutool-system/src/main/java/cn/hutool/system/HostInfo.java

@@ -1,8 +1,11 @@
 package cn.hutool.system;
 
 import java.io.Serializable;
+import java.net.Inet4Address;
 import java.net.InetAddress;
+import java.net.NetworkInterface;
 import java.net.UnknownHostException;
+import java.util.Enumeration;
 
 /**
  * 代表当前主机的信息。
@@ -12,23 +15,28 @@ public class HostInfo implements Serializable{
 
     private final String HOST_NAME;
     private final String HOST_ADDRESS;
+    private final String HOST_NETWORK_CARD_ADDRESS;
 
     public HostInfo() {
         String hostName;
         String hostAddress;
+        String hostNetworkCardAddress;
 
         try {
             InetAddress localhost = InetAddress.getLocalHost();
 
             hostName = localhost.getHostName();
             hostAddress = localhost.getHostAddress();
+            hostNetworkCardAddress = getInternetIp();
         } catch (UnknownHostException e) {
             hostName = "localhost";
             hostAddress = "127.0.0.1";
+            hostNetworkCardAddress = "127.0.0.1";
         }
 
         HOST_NAME = hostName;
         HOST_ADDRESS = hostAddress;
+        HOST_NETWORK_CARD_ADDRESS = hostNetworkCardAddress;
     }
 
     /**
@@ -57,6 +65,45 @@ public class HostInfo implements Serializable{
         return HOST_ADDRESS;
     }
 
+    /**
+     * 取得当前主机的网卡IP地址。
+     * <p>
+     * 例如：<code>"192.168.0.1"</code>
+     * </p>
+     *
+     * @return 网卡IP地址
+     */
+    public final String getNetworkCardAddress() {
+        return HOST_NETWORK_CARD_ADDRESS;
+    }
+
+    /**
+     * 获得网卡IP
+     *
+     * @return 网卡IP
+     */
+    public static String getInternetIp() {
+        String INTRANET_IP = null;
+        try {
+            Enumeration<NetworkInterface> networks = NetworkInterface.getNetworkInterfaces();
+            InetAddress ip = null;
+            Enumeration<InetAddress> addrs;
+            while (networks.hasMoreElements()) {
+                addrs = networks.nextElement().getInetAddresses();
+                while (addrs.hasMoreElements()) {
+                    ip = addrs.nextElement();
+                    if (ip != null && ip instanceof Inet4Address && ip.isSiteLocalAddress() && !ip.getHostAddress().equals(INTRANET_IP)) {
+                        return ip.getHostAddress();
+                    }
+                }
+            }
+            // 如果没有网卡IP，就返回/etc/hosts IP
+            return INTRANET_IP;
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
     /**
      * 将当前主机的信息转换成字符串。
      *
@@ -68,6 +115,7 @@ public class HostInfo implements Serializable{
 
         SystemUtil.append(builder, "Host Name:    ", getName());
         SystemUtil.append(builder, "Host Address: ", getAddress());
+        SystemUtil.append(builder, "Host NETWORK CARD ADDRESS: ", getNetworkCardAddress());
 
         return builder.toString();
     }