使用Jpcap监听网卡，捕获数据包

使用Jpcap监听网卡，捕获数据包，得到mac地址，ip地址和端口号(只解析了tcp数据包)：

import jpcap.JpcapCaptor;  
import jpcap.NetworkInterface;  
import jpcap.PacketReceiver;  
import jpcap.packet.*;

public class Test {
    public static void main(String[] args)
    {
        try {
            final NetworkInterface[] devices = JpcapCaptor.getDeviceList();
            NetworkInterface network_interface = devices[0];
            JpcapCaptor captor = JpcapCaptor.openDevice(network_interface, 65535, false, 20);
            //captor.setFilter("host 122.141.231.18", true);//filter packets from ip
            captor.loopPacket(-1, new Receiver());
            //Receiver receiver = new Receiver(captor.getPacket());//just get one packet
        } catch (Exception exception) {
            exception.printStackTrace();
            System.out.println("fail to dispaly the data of network interface--" + exception);
        }
    }
}

class Receiver implements PacketReceiver {
    public Receiver() {}
    public Receiver(Packet packet) { receivePacket(packet); }
    public void receivePacket(Packet packet) 
    {
        if (packet instanceof TCPPacket) {// just analyse tcp packet
            //output mac addresses
            EthernetPacket ethernet_packet = (EthernetPacket)packet.datalink;
            System.out.print("Mac address----");
            System.out.print("source--" + ethernet_packet.getSourceAddress());
            System.out.print("   ");
            System.out.println("destination--" + ethernet_packet.getDestinationAddress());
            //output ip addresses
            TCPPacket tcp_packet = (TCPPacket)packet;
            System.out.print("ip address----");
            System.out.print("source--" +tcp_packet.src_ip);
            System.out.print("   ");
            System.out.println("destination--" + tcp_packet.dst_ip);
            //output ports
            System.out.print("port----");
            System.out.print("source--" +tcp_packet.src_port);
            System.out.print("   ");
            System.out.println("destination--" + tcp_packet.dst_port);
            //output data
            System.out.println("data----");
            for (int index = 0; index < tcp_packet.data.length; ++index) {
                System.out.print((char)tcp_packet.data[index]);
            }
        }
        System.out.println();
    }
}

 

以后再来完善吧...