使用ICMP协议实现ping命令，用raw socket实现，简洁清晰，学习网络编程必看。,The use of ICMP protocol ping command, using raw socket to achieve, simple clear, see Learning Network Programming.

一個簡單的udp傳輸封包範例，讓你了解udp封包傳輸的基本概念,A simple example of udp packet transmission, so that you understand the basic concepts of udp packet transmission

有效简单的TCP和UDP连接服务器的JAR包，文件名后缀.zip直接改成.jar就行-ffective simple TCP and UDP to connect to the server JAR bag, the filename suffix. Zip directly into. JAR will do