基于发布订阅机制的即时通讯系统的设计与实现

s instant messaging plays a more and more important role in mobile phone applications, it has become an integral part of mobile phone applications. The design of the traditional instant messaging system is too complex to be used by companies with small - scale users. This paper provides a suitable scheme for the design of instant messaging system. First of all, this paper introduces the publish and subscribe mechanism briefly, then introduces the design of the system in detail, including the module design and the realization of each module, and gives an in-depth explanation of the active subscription and passive subscription mechanism in the system operation. Finally, the usability of this scheme is verified by system test.