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String sip="";
String smac="";
sip = request.getHeader("x-forwarded-for");
if(sip == null ||sip.length() == 0 || "unknown".equalsIgnoreCase(sip))
{
sip = request.getHeader("proxy-Client-IP");
}
if (sip == null || sip.length() == 0 || "unknown".equalsIgnoreCase(sip))
{
    sip = request.getHeader("WL-Proxy-Client-IP");
}  
if (sip == null ||sip.length() == 0 || "unknown".equalsIgnoreCase(sip))
{
    sip = request.getRemoteAddr();
}
    if(!"127.0.0.1".equals(sip)) //±¾»ú¹ýÂ˵ô
   {
       Process process = Runtime.getRuntime().exec("nbtstat -a " + sip);
       InputStreamReader ir = new InputStreamReader(process.getInputStream());
    LineNumberReader input = new LineNumberReader(ir);
    String line;
   while ((line = input.readLine()) != null)
      if (line.indexOf("MAC Address") > 0)
    {
          smac = line.substring(line.indexOf("-") - 2);
    }
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