Java/JSP获得客户端网卡MAC地址的三种方法解析

1???Java?NetworkInterface?:????????,????NetworkInterface??getHardwareAddress()?????MAC????????????:

```java

import java.net.NetworkInterface;

import java.net.SocketException;

public class GetMacAddress {

public static void main(String[] args) {

try {

// ??????????

NetworkInterface networkInterface = NetworkInterface.getByName("eth0");

// ??MAC??

byte[] mac = networkInterface.getHardwareAddress();

// ?MAC????????????

StringBuilder macAddress = new StringBuilder();

for (int i = 0; i < mac.length; i++) {

macAddress.append(String.format("X%s", mac[i], (i < mac.length - 1) ? "-" : ""));

}

System.out.println("MAC??:" + macAddress.toString());

} catch (SocketException e) {

e.printStackTrace();

}

}

}

```

2???Java?InetAddress?:????InetAddress??getLocalHost()?????????InetAddress??,????getHostName()???????,???getByName()????InetAddress??,????getHardwareAddress()????MAC????????????:

```java

import java.net.InetAddress;

import java.net.NetworkInterface;

import java.net.SocketException;

public class GetMacAddress {

public static void main(String[] args) {

try {

// ??????InetAddress??

InetAddress localHost = InetAddress.getLocalHost();

// ?????

String hostname = localHost.getHostName();

// ??????????

NetworkInterface networkInterface = NetworkInterface.getByName(hostname);

// ??MAC??

byte[] mac = networkInterface.getHardwareAddress();

// ?MAC????????????

StringBuilder macAddress = new StringBuilder();

for (int i = 0; i < mac.length; i++) {

macAddress.append(String.format("X%s", mac[i], (i < mac.length - 1) ? "-" : ""));

}

System.out.println("MAC??:" + macAddress.toString());

} catch (Exception e) {

e.printStackTrace();

}

}

}

```

3???JavaScript?JSP:????JavaScript??????MAC??,??????Ajax???JSP????????????:

```html

```

?getMacAddress.jsp?,????request.getParameter("macAddress")???MAC?????