javaweb项目 UDP发送请求获取客户端MAC地址

 
 
java代码

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

/**
 * 主机A向主机B发送“UDP-NetBIOS-NS”询问包,即向主机B的137端口,发Query包来询问主机B的NetBIOS Names信息。
 * 其次,主机B接收到“UDP-NetBIOS-NS”询问包,假设主机B正确安装了NetBIOS服务........... 而且137端口开放,则主机B会向主机A发送一个“UDP-NetBIOS-NS”应答包,即发Answer包给主机A。
 * 并利用UDP(NetBIOS Name Service)来快速获取远程主机MAC地址的方法
 * 
 */
public 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();
	}

	public final DatagramPacket send(final byte[] bytes) throws IOException {
		DatagramPacket dp = new DatagramPacket(bytes,bytes.length,InetAddress.getByName(sRemoteAddr),iRemotePort);
		ds.send(dp);
		return dp;
	}

	public final DatagramPacket receive() throws Exception {
		DatagramPacket dp = new DatagramPacket(buffer,buffer.length);
		ds.receive(dp);
		return dp;
	}
	public 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 = 15; i < 45; 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;
	}
	public final String GetMacAddr(byte[] brevdata) throws Exception {
		// 获取计算机名
		int i = brevdata[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 & 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;
	}
	
	public static void main(String args[]) throws Exception{
		UdpGetClientMacAddr umac=new UdpGetClientMacAddr("172.19.1.198");
		System.out.println(umac.GetRemoteMacAddr());
	}
}

JSP代码

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

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();   
}
	System.out.println(sip);
	UdpGetClientMacAddr umac= new UdpGetClientMacAddr(sip);
	System.out.println(umac.GetRemoteMacAddr());
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
    This is my JSP page. <br>
   <!--   <input value=<%=smac %> name="userMacAddr" size="20" style="width:150px" readonly="yes">-->
  </body>
</html>


你可能感兴趣的:(javaweb项目 UDP发送请求获取客户端MAC地址)