Ottieni l'indirizzo MAC del sistema in Java

Question

Ho bisogno di ottenere l'indirizzo mac del sistema che esegue il programma. Ma non sono in grado di farlo.

Sto scrivendo seguente codice:

public class App{ 

     public static void main(String[] args){ 

     InetAddress ip; 
     try { 

      ip = InetAddress.getLocalHost(); 
      System.out.println("Current IP address : " + ip.getHostAddress()); 

      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(); 

     } 

     } 

    } 

E sto ottenendo i seguenti risultati:

Current IP address : 14.96.192.202 
Current MAC address : 

Non ricevo il MAC Address è vuota.

ho visto questo esempio da here

Answer 1

Se si rappresentano interfacce multiple, e alcuni indirizzi MAC nulli (Sono in esecuzione di Java 7 su Windows 7 con installato VMWare (quindi ho alcune schede di rete virtuali)) allora questo codice sembra funzionare:

public static void main(String[] args) { 
    try { 
    InetAddress ip = InetAddress.getLocalHost(); 
    System.out.println("Current IP address : " + ip.getHostAddress()); 

    Enumeration<NetworkInterface> networks = NetworkInterface.getNetworkInterfaces(); 
    while(networks.hasMoreElements()) { 
     NetworkInterface network = networks.nextElement(); 
     byte[] mac = network.getHardwareAddress(); 

     if(mac != null) { 
     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(); 
    } 
} 

Ecco (una versione sterilizzata di) quello che vedo sul mio computer quando l'eseguo:

Current IP address : {I'm not telling :)} 
Current MAC address : 
Current MAC address : {actual hardware interface} 
Current MAC address : 00-00-00-00-00-00-00-E0 
Current MAC address : 00-00-00-00-00-00-00-E0 
Current MAC address : 00-00-00-00-00-00-00-E0 
Current MAC address : 00-00-00-00-00-00-00-E0 
Current MAC address : 00-00-00-00-00-00-00-E0 
Current MAC address : 00-50-56-C0-00-01 
Current MAC address : 00-50-56-C0-00-08 

Ed ecco l'output di correre ipconfig /all

C:\>ipconfig /all 

Windows IP Configuration (minus any actual interface because I don't like sharing that kind of information :) 

Ethernet adapter Local Area Connection 2: 

    Media State . . . . . . . . . . . : Media disconnected 
    Connection-specific DNS Suffix . : 
    Description . . . . . . . . . . . : Gbridge Virtual Private Network Adapter 
    Physical Address. . . . . . . . . : 02-50-F2-CE-82-01 
    DHCP Enabled. . . . . . . . . . . : Yes 
    Autoconfiguration Enabled . . . . : Yes 

Ethernet adapter VMware Network Adapter VMnet1: 

    Connection-specific DNS Suffix . : 
    Description . . . . . . . . . . . : VMware Virtual Ethernet Adapter for VMnet1 
    Physical Address. . . . . . . . . : 00-50-56-C0-00-01 
    DHCP Enabled. . . . . . . . . . . : No 
    Autoconfiguration Enabled . . . . : Yes 
    Link-local IPv6 Address . . . . . : fe80::9c27:3d03:da2c:f14d%19(Preferred) 
    Autoconfiguration IPv4 Address. . : {Hidden}(Preferred) 
    Subnet Mask . . . . . . . . . . . : 255.255.0.0 
    Default Gateway . . . . . . . . . : 
    DHCPv6 IAID . . . . . . . . . . . : 268456022 
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-DB-D9-CB-B8-AC-6F-AF-9D-F2 
    DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1 
             fec0:0:0:ffff::2%1 
             fec0:0:0:ffff::3%1 
    NetBIOS over Tcpip. . . . . . . . : Enabled 

Ethernet adapter VMware Network Adapter VMnet8: 

    Connection-specific DNS Suffix . : 
    Description . . . . . . . . . . . : VMware Virtual Ethernet Adapter for VMnet8 
    Physical Address. . . . . . . . . : 00-50-56-C0-00-08 
    DHCP Enabled. . . . . . . . . . . : No 
    Autoconfiguration Enabled . . . . : Yes 
    Link-local IPv6 Address . . . . . : fe80::cdbb:434:7fd9:2574%20(Preferred) 
    IPv4 Address. . . . . . . . . . . : 192.168.42.1(Preferred) 
    Subnet Mask . . . . . . . . . . . : 255.255.255.0 
    Default Gateway . . . . . . . . . : 
    DHCPv6 IAID . . . . . . . . . . . : 285233238 
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-DB-D9-CB-B8-AC-6F-AF-9D-F2 
    DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1 
             fec0:0:0:ffff::2%1 
             fec0:0:0:ffff::3%1 
    NetBIOS over Tcpip. . . . . . . . : Enabled 

Tunnel adapter 6TO4 Adapter: 

    Description . . . . . . . . . . . : Microsoft 6to4 Adapter 
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0 
    DHCP Enabled. . . . . . . . . . . : No 
    Autoconfiguration Enabled . . . . : Yes 
    IPv6 Address. . . . . . . . . . . : 2002:204c:1bc6::204c:1bc6(Preferred) 
    Default Gateway . . . . . . . . . : 
    NetBIOS over Tcpip. . . . . . . . : Disabled 

Tunnel adapter isatap.{3E45CB42-BC1E-4F89-9C16-25166C0EABA1}: 

    Media State . . . . . . . . . . . : Media disconnected 
    Connection-specific DNS Suffix . : 
    Description . . . . . . . . . . . : Microsoft ISATAP Adapter 
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0 
    DHCP Enabled. . . . . . . . . . . : No 
    Autoconfiguration Enabled . . . . : Yes 

Tunnel adapter isatap.{77F1FADC-02BA-44AF-9FDF-97E23F8B5FE7}: 

    Media State . . . . . . . . . . . : Media disconnected 
    Connection-specific DNS Suffix . : 
    Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3 
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0 
    DHCP Enabled. . . . . . . . . . . : No 
    Autoconfiguration Enabled . . . . : Yes 

Tunnel adapter isatap.{608257AC-C0F3-43A5-8595-898533C95D90}: 

    Media State . . . . . . . . . . . : Media disconnected 
    Connection-specific DNS Suffix . : 
    Description . . . . . . . . . . . : Microsoft ISATAP Adapter #5 
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0 
    DHCP Enabled. . . . . . . . . . . : No 
    Autoconfiguration Enabled . . . . : Yes 

La sfida a ottenere "un solo valore" da questo pasticcio nasce dal rapporto tra InetAddress.getLocalHost().getHostAddress() e le interfacce di rete stessi. Considerate questa leggera versione ampliata del programma iniziale (usando questo davvero cool classe IterableEnumeration di utilità):

public static void main(String[] args) throws UnknownHostException, SocketException { 
    System.out.println("Current IP address : " + InetAddress.getLocalHost().getHostAddress()); 

    for(NetworkInterface network : IterableEnumeration.make(NetworkInterface.getNetworkInterfaces())) { 
    byte[] mac = network.getHardwareAddress(); 
    if(mac != null) { 
     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()); 
     //Bound InetAddress for interface 
     for(InetAddress address : IterableEnumeration.make(network.getInetAddresses())) { 
     System.out.println("\tBound to:"+address.getHostAddress()); 
     } 
    } 
    } 
} 

Se si esegue questo sul vostro computer vedrete il vostro indirizzo IP attuale è correlato ad un adattatore, ma l'indirizzo MAC del l'interfaccia hardware vede se stessa come un diverso indirizzo IP. Forse puoi filtrare gli indirizzi virtuali o semplicemente trovare un modo per utilizzare tutti gli indirizzi disponibili.