TCP协议模拟，用JAVA图形界面实现，模拟了在复杂信道下的丢包等问题。,TCP protocol simulation, implementation using JAVA graphical interface, analog channel in the complex under the packet loss and so on.

文件传输的并发服务器，包含基于tcp协议和udp协议的 ,Concurrent file transfer server that contains the tcp-based protocols and udp protocol