为什么用Jpcap抓Tcp包，抓到的特别少？只有一次等了好长时间抓到一个，其他时候都没有

Question

public static void main(String[] args) throws IOException {

NetworkInterface[] devices=JpcapCaptor.getDeviceList();   

for(NetworkInterface n : devices)

System.out.println(n.name + "    |      " + n.description );

System.out.println("------------------------------------");

JpcapCaptor jpcap=null;

int caplen = 65535;

boolean promiscCheck = true;

try {

jpcap=JpcapCaptor.openDevice(devices[1],caplen,promiscCheck,50);

} catch (IOException e) {

e.printStackTrace();

}

int j = 0;

while(j < 100)

{

Packet packet = jpcap.getPacket();

    if(packet instanceof TCPPacket )

    {

        TCPPacket tcpPacket = (TCPPacket)packet;

        if(tcpPacket.src_port==80||tcpPacket.dst_port==80) 

        {

        j++;

        System.out.print("数据:n"+j); 

        for (int i = 0; i < tcpPacket.data.length; i++) {

            System.out.print((char)tcpPacket.data[i]);

            }

        }

    }

}

}

Answer 1

你防火墙关了试试