基于UDP的组播聊天室,人们可以进行组播聊天-Multicast UDP-based chat room, chat with people can be multicast

组播聊天室的实现，按照三层体系结构（表示逻辑、应用逻辑、服务逻辑）来设计和实现。-Multicast chat room, according to the three-tier architecture (presentation logic, application logic, service logic) to design and implement.