1、pcap4j框架使用的驱动Npcap需要进行安装

2、获取自己window电脑的mac地址设备

在cmd中使用的命令是getmac

使用程序获取服务器本身的mac地址

java">import org.pcap4j.core.PcapNativeException;
import org.pcap4j.core.PcapNetworkInterface;
import org.pcap4j.core.Pcaps;public class ListDevices {public static void main(String[] args) throws PcapNativeException {for (PcapNetworkInterface nif : Pcaps.findAllDevs()) {System.out.println(nif.getName() + " (" + nif.getDescription() + ")");}}}

获取的类似于这种，但是实际代码使用需要加双斜杠

\Device\NPF_{YOUR_INTERFACE_ID}

例如（\\Device\\NPF_{YOUR_INTERFACE_ID}）

3、编写发送报文的程序

发送端

import org.pcap4j.core.*;
import org.pcap4j.packet.Packet;
import org.pcap4j.packet.UnknownPacket;public class Sender {private static final String INTERFACE_NAME = "\\Device\\NPF_{网卡地址}"; // 替换为实际的网卡名称private static final byte[] INSTRUCTION = "Hello from Sender".getBytes();public static void main(String[] args) throws PcapNativeException, NotOpenException, InterruptedException {PcapNetworkInterface nif = Pcaps.getDevByName(INTERFACE_NAME);if (nif == null) {System.err.println("No such device found: " + INTERFACE_NAME);return;}PcapHandle handle = nif.openLive(65536, PcapNetworkInterface.PromiscuousMode.PROMISCUOUS, 10);Packet packet = UnknownPacket.newPacket(INSTRUCTION, 0, INSTRUCTION.length);handle.sendPacket(packet);System.out.println("Instruction sent.");handle.loop(10, new PacketListener() {@Overridepublic void gotPacket(Packet packet) {System.out.println("Received response: " + new String(packet.getRawData()));}});handle.close();}}