Design of instant communication system based on B/S and C/S

To solve the problem of traditional C/S model which can't perform Cross-Platform perfectly, a design of instant communication system on the basis of B/S and C/S is proposed in this thesis. This system takes full advantage of Web2.0, exerts the advantages of B/S model and adopts popular Web technique: CSS combined with DIV, and Ajax asynchronous transmission; It uses excellent layered structure model: the data access layer, the business logic layer, the user interface layer; It applies input validation and character filtration for security so that SQL injection attack and other attacks can be avoided, thus the stability of the system can be ensured.