抓包前，首先要编写实现了PacketReceiver接口的类，即数据包处理器，由与抓包时，对应某个网络接口的JpcapCaptor对象会阻塞，所以我们将每个网卡上得到的对应的用用于网络抓包，输入数据包类型。JpcapCaptor对象放到一个独立线程中运行；TestPacketReceiver是个数据包解析器，本例中我们只是简单打印出收到的数据包类型及关键参数。-Ethereal, we should first write a class implements the PacketReceiver interfaces, or data packet processor, and get caught by the time corresponding to a network interface JpcapCaptor object will block, so we will get each card to use with the corresponding the network packet capture, the input data packet type. JpcapCaptor objects in a separate thread to run　TestPacketReceiver a packet parser, in this case, we simply print out the received data packet types and key parameters.