Java get visitor IP and MAC address

Get the visitor's IP, code:

<%string sip= ""; try{sip = (String) request.getremoteaddr ();} catch (Exception e) {}%>

Gets the visitor MAC address, which is used by the UDP protocol to send the query Mac instruction and then return the value to resolve the Mac. Code

<%string SMAC = "";   String 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 (); } udpgetclientmacaddr Umac = new udpgetclientmacaddr (SIP); SMAC = Umac. %>...<input value=<%=smac%> name= "usermacaddr" size= "getremotemacaddr" style= "width:150px" readonly= "yes" > Udpgetclientmacaddr.javapackage cch;import java.io.*;import java.net.*;p ublic class    udpgetclientmacaddr {private String sremoteaddr;    private int iremoteport=137;    Private byte[] buffer = new byte[1024];        Private Datagramsocket Ds=null;     Public udpgetclientmacaddr (String straddr) throws exception{sremoteaddr = straddr;   ds = new Datagramsocket (); } Protected final Datagrampacket send (final byte[] bytes) throws IOException {Datagrampacket DP = new Datagram     Packet (Bytes,bytes.length,inetaddress.getbyname (SREMOTEADDR), iremoteport);        Ds.send (DP);    return DP; } protected final Datagrampacket receive () throws Exception {Datagrampacket dp = new Datagrampacket (buffer,buf     Fer.length);     Ds.receive (DP);    return DP;     } protected byte[] Getquerycmd () throws Exception {byte[] T_ns = new BYTE[50];        T_ns[0] = 0x00;        T_NS[1] = 0x00;        T_NS[2] = 0x00;        T_NS[3] = 0x10;        T_NS[4] = 0x00;        T_NS[5] = 0x01;        T_NS[6] = 0x00;        T_NS[7] = 0x00;        T_NS[8] = 0x00;        T_NS[9] = 0x00;        T_NS[10] = 0x00;        T_NS[11] = 0x00;        T_NS[12] = 0x20;        T_NS[13] = 0x43;                T_NS[14] = 0x4B;        for (int i = +; i <; i++) {t_ns[i] = 0x41; } t_ns[45] = 0x00;       T_NS[46] = 0x00;        T_NS[47] = 0x21;        T_NS[48] = 0x00;     T_NS[49] = 0x01;    return T_ns;        } Protected Final String getmacaddr (byte[] brevdata) throws Exception {int i = brevdata[56] * 18 + 56;        String saddr= "";                        StringBuffer sb = new StringBuffer (17);            for (int j = 1; J < 7;j++) {saddr = integer.tohexstring (0xFF & Brevdata[i+j]);            if (Saddr.length () < 2) {sb.append (0);            } sb.append (Saddr.touppercase ());        if (J < 6) sb.append (': ');    } return sb.tostring ();     Public final void Close () {try {ds.close ();     } catch (Exception ex) {ex.printstacktrace ();     }} public final String getremotemacaddr () throws Exception {byte[] bqcmd = Getquerycmd ();     Send (Bqcmd);        Datagrampacket DP = receive ();        String SMAC = getmacaddr (Dp.getdata ());     Close ();           return SMAC; }}

　　

Java get visitor IP and MAC address