JAVA侦听IP包，JAVA本身不支持IP层的解析，需要通过JNI调用C代码完成功能-JAVA listening IP packet, JAVA own IP layer does not support the resolution, the need for JNI call through the completion of C code function

jPCAP在JAVA中，并非一个真正去实现对数据链路层的控制，而是一个中间件，JPCAP调用winpcap/libpcap，给 JAVA语言提供一个公共的接口，从而实现了平台无关性。(jPCAP in JAVA, not really a realization of the data link layer control, but a middleware, JPCAP call winpcap / libpcap, to the JAVA language to provide a comm