0.使用Java开发，需要JRE1.2以上的版本；
1.运行程序前请确保已正常安装Winpcap4.x;
2.运行前请把Jpap.dll复制到系统的path如%SystemRoot%\system32目录下；
3.双击JSniffer.exe或JSniffer.jar即可运行程序
a simple sniffer programme written in Java 1.2+ with Jpap. Double clicck JSniffer.exe or JSniffer.jar, and the Jpap.dll should put into the path env or %SystemRoot%\system32 , besides the Winpcap4.x should be installed.