方法一:

调用Windows的DOS命令,从输出结果中读取MAC地址:

public static String getMACAddress() {

String address = "";
String os = System.getProperty("os.name");
if ( os != null && os.startsWith("Windows")) {
try {
String command = "cmd.exe /c ipconfig /all";
Process p = Runtime.getRuntime().exec(command);
BufferedReader br =
new BufferedReader(
new InputStreamReader(p.getInputStream()));
String line;
while ((line = br.readLine()) != null) {
if (line.indexOf("Physical Address") > 0) {
int index = line.indexOf(":");
index += 2;
address = line.substring(index);
break;
}
}
br.close();
return address.trim();
}
catch (IOException e) { }
}
return address;
}

We can replace the "ipconfig" to "ping x.x.x.x" and "arp -a"...We can get the mac list...haha!!

缺点:只能取得服务器端MAC地址.如果要取得客户端的MAC地址,需用Applet.只针对MS-WIN系统.

方法二:

可以用JS或vbscript来调用WMI接口来获取Client端的MAC地址.

 
 
 
 
 
 
 
  
  

忘了附上原文的出处了：
How to get IP address of the browser when its operating behind a proxy/firewall? (applets...activex....??)
http://www.faqts.com/knowledge_base/view.phtml/aid/9005/fid/125

关于WMI的详细信息可以参看MSDN:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/wmi_tasks_for_scripts_and_applications.asp

平心而论，WMI的很强大的。原先需要动用重量级编程工具才能做到的事，现在用js/vbscript就可以做了。

获取多块网卡的MAC地址:

if(objObject.MACAddress != null && objObject.MACAddress != "undefined"){
                         MACAddr = objObject.MACAddress;
                         alert( MACAddr );
                   }

缺点:需要ActiveX支持.对MS-WIN系统有效.

方法三:

想137口发送UDP查询:

WINDOWS平台的客户端(当获取时它转换为服务端角色),NETBIOS协议在137口上,我们只要向它的137口发送UDP查询,获取它的返回值就可以获取到它所有的网卡地址.

以上内容来自dev2dev的讨论帖:

http://dev2dev.bea.com.cn/bbs/thread.jspa?forumID=121&threadID=12941&tstart=0