JAVA获取局域网内对应IP电脑的MAC地址（物理地址）

创建类UdpGetClientMacAddr.java 

package com.shuzhiqiang.common;

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() throws Exception {
        ds.close();
    }

    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("127.0.0.1");
        UdpGetClientMacAddr umac  = new UdpGetClientMacAddr("192.168.2.32");
        System.out.println(umac.GetRemoteMacAddr());
    }
}

用GetMacController.java实现restful接口调用获取MAC地址返回值

package com.shuzhiqiang.controller;

import com.shuzhiqiang.common.ReturnCodes;
import com.shuzhiqiang.common.UdpGetClientMacAddr;
import com.shuzhiqiang.util.Response;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

@RequestMapping("/getMac")
@Controller
public class GetMacController {

    /*获取本地mac地址*/
    @RequestMapping("/local")
    @ResponseBody
    public Object local(
            @RequestParam(name = "ip", defaultValue = "127.0.0.1") String ip
    ) throws Exception {
        UdpGetClientMacAddr mac = new UdpGetClientMacAddr(ip);
        String macAddress = mac.GetRemoteMacAddr();
        Response response = new Response(ReturnCodes.success, macAddress);
        return response;
    }

    //测试----------------------------------------
    public static void main(String[] args) throws Exception {
        UdpGetClientMacAddr mac = new UdpGetClientMacAddr("192.168.2.32");
      //UdpGetClientMacAddr mac = new UdpGetClientMacAddr("192.168.2.25");
        System.out.println(mac.GetRemoteMacAddr());
    }
}