通过TCP和UDP实现客户端及服务器的通信。消息类型是通过字符串来实现的；用该类似的字符串来标识消息的类型。对JAVA的SOCKET网络编程比较感兴趣的，该程序起到了不少帮助，可以加深对SOCKET编程的理解。-Implementation through the TCP and UDP client and server communication. The type of message is achieved through the string with the similar str