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 common interface to achieve a platform-independent.)