TCP IP客户端

代码说明：

  输控制协议（TCP，Transmission Control Protocol）是一种面向连接的、可靠的、基于字节流的传输层通信协议，由IETF的RFC 793定义。TCP旨在适应支持多网络应用的分层协议层次结构。(Transmission Control Protocol (TCP) is a connection-oriented, reliable, byte-stream-based transport layer communication protocol defined by IETF RFC 793. TCP aims at adapting to the hierarchical protocol structure supporting multi-network applications.)