一、前言
通过定义NetworkUtils网络工具类,实现外网或内网环境下获取客户端mac网卡地址信息(可以参考 java.net.NetworkInterface方式实现 ),详情参见代码示例。
二、代码示例
1. UdpGetClientMacAddr解析类 - 从DatagramPacket网络包中解析获取mac地址信息
package com.xwood.fs.util;@b@@b@import java.io.IOException;@b@import java.net.DatagramPacket;@b@import java.net.DatagramSocket;@b@import java.net.InetAddress;@b@ @b@/** @b@ * 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。 @b@ * 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。 @b@ * 并利用UDP(NetBIOS Name Service)来快速获取远程主机MAC地址的方法 @b@ * @b@ */ @b@public class UdpGetClientMacAddr { @b@ @b@ private String sRemoteAddr; @b@ private int iRemotePort=137; @b@ private byte[] buffer = new byte[1024]; @b@ private DatagramSocket ds=null; @b@ @b@ public UdpGetClientMacAddr(String strAddr) throws Exception{ @b@ sRemoteAddr = strAddr; @b@ ds = new DatagramSocket(); @b@ } @b@ @b@ public final DatagramPacket send(final byte[] bytes) throws IOException { @b@ DatagramPacket dp = new DatagramPacket(bytes,bytes.length,InetAddress.getByName(sRemoteAddr),iRemotePort); @b@ ds.send(dp); @b@ return dp; @b@ } @b@ @b@ public final DatagramPacket receive() throws Exception { @b@ DatagramPacket dp = new DatagramPacket(buffer,buffer.length); @b@ ds.receive(dp); @b@ return dp; @b@ } @b@ public byte[] GetQueryCmd() throws Exception { @b@ byte[] t_ns = new byte[50]; @b@ t_ns[0] = 0x00; @b@ t_ns[1] = 0x00; @b@ t_ns[2] = 0x00; @b@ t_ns[3] = 0x10; @b@ t_ns[4] = 0x00; @b@ t_ns[5] = 0x01; @b@ t_ns[6] = 0x00; @b@ t_ns[7] = 0x00; @b@ t_ns[8] = 0x00; @b@ t_ns[9] = 0x00; @b@ t_ns[10] = 0x00; @b@ t_ns[11] = 0x00; @b@ t_ns[12] = 0x20; @b@ t_ns[13] = 0x43; @b@ t_ns[14] = 0x4B; @b@ @b@ for(int i = 15; i < 45; i++){ @b@ t_ns[i] = 0x41; @b@ } @b@ t_ns[45] = 0x00; @b@ t_ns[46] = 0x00; @b@ t_ns[47] = 0x21; @b@ t_ns[48] = 0x00; @b@ t_ns[49] = 0x01; @b@ return t_ns; @b@ } @b@ public final String GetMacAddr(byte[] brevdata) throws Exception { @b@ // 获取计算机名 @b@ int i = brevdata[56] * 18 + 56; @b@ String sAddr=""; @b@ StringBuffer sb = new StringBuffer(17); @b@ // 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) @b@ // 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。 @b@ for(int j = 1; j < 7;j++) @b@ { @b@ sAddr = Integer.toHexString(0xFF & brevdata[i+j]); @b@ if(sAddr.length() < 2) @b@ { @b@ sb.append(0); @b@ } @b@ sb.append(sAddr.toUpperCase()); @b@ if(j < 6) sb.append(':'); @b@ } @b@ return sb.toString(); @b@ } @b@ @b@ public final void close() throws Exception { @b@ ds.close(); @b@ } @b@ @b@ public final String GetRemoteMacAddr() throws Exception { @b@ byte[] bqcmd = GetQueryCmd(); @b@ send(bqcmd); @b@ DatagramPacket dp = receive(); @b@ String smac = GetMacAddr(dp.getData()); @b@ close(); @b@ @b@ return smac; @b@ } @b@ @b@ public static void main(String args[]) throws Exception{ @b@ UdpGetClientMacAddr umac=new UdpGetClientMacAddr("142.10.12.181"); @b@ umac=new UdpGetClientMacAddr("192.168.1.12"); @b@ System.out.println(umac.GetRemoteMacAddr()); @b@ } @b@}
2. NetworkUtils 调用工具类(getMac方法)
package com.xwood.fs.util;@b@@b@import javax.servlet.http.HttpServletRequest;@b@@b@import org.apache.commons.lang3.StringUtils;@b@@b@public class NetworkUtils {@b@@b@ public static String getIp(HttpServletRequest request) {@b@ try {@b@ @b@ String ip = request.getHeader("x-forwarded-for");// 配置代理情况,配置代理后header信息通过x-forwarded-for标记真实ip地址@b@@b@ if ((ip == null) || (ip.length() == 0)@b@ || ("unknown".equalsIgnoreCase(ip))) {@b@ ip = request.getHeader("Proxy-Client-IP");// 整合apache+Weblogic 代理情况@b@ }@b@@b@ if ((ip == null) || (ip.length() == 0)@b@ || ("unknown".equalsIgnoreCase(ip))) {@b@ ip = request.getHeader("WL-Proxy-Client-IP");// 整合apache+Weblogic@b@ // 代理情况@b@ }@b@@b@ if ((ip == null) || (ip.length() == 0)@b@ || ("unknown".equalsIgnoreCase(ip))) {@b@ ip = request.getRemoteAddr();// 获取未配置代理的情况@b@ }@b@@b@ ip = getIp(ip);@b@ return ip;@b@ } catch (Exception e) {@b@ e.printStackTrace();@b@ }@b@ return "";@b@ }@b@@b@ private static String getIp(String ip) {@b@ @b@ if ((ip != null) && (ip.indexOf(44) > 0)) {@b@ String[] ipArray = ip.split(",");@b@@b@ ip = ipArray[(ipArray.length - 1)].trim();@b@ }@b@ return ip;@b@ @b@ }@b@ @b@ @b@ public static String getMac(HttpServletRequest request){@b@ try {@b@ String clientIp=getIp(request);@b@ if(StringUtils.isEmpty(clientIp)){@b@ return null;@b@ }@b@ UdpGetClientMacAddr umac = new UdpGetClientMacAddr(clientIp);@b@ return umac.GetRemoteMacAddr();@b@ } catch (Exception e) {@b@ e.printStackTrace();@b@ }@b@ return null;@b@ }@b@@b@}