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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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Java Console provides information about the Java Runtime Environment
(JRE) version, user home directory, and any error message that occurs
while running an applet or application. You can enable the Java Console
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