根据套接字建立TCP连接的过程，创建服务端程序，并在接收到客户端连接请求后，产生一个新的线程来处理这个客户端的通讯工作-Process to establish a TCP connection according to the socket to create a server program, and receives the client connection requests, resulting in a new thread to handle client communicatio

建立基于TCP套接字的服务器与客户端的连接，客户端向服务器发送字符串，服务器将接受到的字符串打印出来-Establish a connection based on the TCP socket server and client, the client sends the server a string, the server will receive the string print out

Linux环境下自己构建包packet，包括MAC头部，UDP、TCP头部，以及数据及校验和计算，构建完包之后用原始套接字来进行发送-After the Linux environment to build their own package packet, including the MAC header, UDP, TCP header, and data and checksum calculation, build complete package with a raw socket t