private String GetMacAddr(byte[] b) throws Exception
{
// 获取计算机名
//System.out.println(new String(b, 57, 18));
//System.out.println(new String(b, 75, 18));
//System.out.println(new String(b, 93, 18));
int i = b[56] * 18 + 56;
String sAddr = "";
StringBuffer sb = new StringBuffer(17);
// 先从第56字节位置，读出Number Of Names（NetBIOS名字的个数，其中每个NetBIOS Names
// Info部分占18个字节）
// 然后可计算出“Unit ID”字段的位置＝56＋Number Of
// Names×18，最后从该位置起连续读取6个字节，就是目的主机的MAC地址。
for (int j = 1; j < 7; j++)
{
sAddr = Integer.toHexString(0xFF & b[i + j]);
if (sAddr.length() < 2)
{
sb.append(0);
}
sb.append(sAddr.toUpperCase());
if (j < 6)
sb.append('-');
}
return sb.toString();
}
{
try
{
ds.close();
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
public String GetRemoteMacAddr() throws Exception
{
byte[] bqcmd = GetQueryCmd();
this.send(bqcmd);
DatagramPacket dp = this.receive();
String smac = GetMacAddr(dp.getData());
this.close();
return smac;
}
public static void main(String[] args) throws Exception
{
RemoteMacAddr addr = new RemoteMacAddr("192.168.1.119");
System.out.println(addr.GetRemoteMacAddr());
}
}