如何在Web应用程序中查找客户端系统mac地址

Question

I need to find client MAC address who is accessing my website. I have tried with java code.

try {

    Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
    while(networkInterfaces.hasMoreElements())
    {
        NetworkInterface network = networkInterfaces.nextElement();
        System.out.println("network : " + network);
        byte[] mac = network.getHardwareAddress();
        if(mac == null)
        {
            System.out.println("null mac");             
        }
        else
        {
            System.out.print("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) ? "-" : ""));        
            }
             val = sb.toString();
            System.out.println(sb.toString());  
            break;
        }
    }
} catch (SocketException e){

    e.printStackTrace();

}

But it display as "network : name:eth0 (eth0) MAC address : EC-A8-6B-77-A9-AD" for all client system.

how can i do this?

Answer 1

Server side Java code will never return the client's MAC address.

For that you would need a code running at the client. For example in IE you could get that with Javascript+ActiveX. In other browsers (including IE) you could do that with a Java Applet, but security restraints might prevent the applet to access system information including the MAC address.