Design And Implementation Of Text Information Filtering Based Firewall For SMS

The 21st century is a new epoch of information technology,and it is also a new epoch of internet. Along with the mobile communication technology rapid development and the handset popular rate rapid enhancement, the handset short message more and more receives the multitudinous public figure's favor. The short message industry takes up honest work by its short, rapid, simple, inexpensive and so on many merits to become people's one kind of important communication and exchange way day by day. In the rapid development process of mobile short message services, on the one hand which bring each kind of convenience to users, on the other hand as a result of each kind of trash short messages massive appearances, which also bring in the information security questions that have affected people's normal life. Thus it is extremely necessary to filter out trash short messages.Through the analysis of the short message service structure, the short message transmission way has two kinds, one kind is the SP-handset, and another kind is the handset-handset, regardless of which kind all are carried on the short message service center to restore and retransmit, then arrive the user handset.Therefore there may be two aspects to filter trash short messages, one kind is that those are filtered by the short message service center, another kind is the way of filtered by handset terminal. Regardless of the filter way of the short message service center or the handset terminal, all have some insufficiencies. In order to better realize trash short message filters, this system used the filter way of the short message service center, unified the method of the blacklisting, double buffering, multi-threading technology, reverse finite automata technology, thus realized the trash short message filtering.Finally, the thesis proposes a design scheme of content-based text filtering prototype system and describes the details of its implementation. The system is designed based on the software principles. The development follows the object-oriented principles. The system has hierachical levels, It uses JAVA to develop in Service provider to make probability good, the executing efficiency of the code is high and the connection to database is convenient. The system uses Multi-thread and Double-buffering technologies to have high performance. The business processing and the business website is implemented by the four layers of architecture which combined with C/S and B/S. the Representation Layer implements the organization of the visual elements in the Web forms and the design of user interfaces; the Application Logical layer focus on how to establish and organize each function module and the method of calling the Web Services; Accesses and manages the data source is implemented by Web Service in the Data Access Layer. In the end, the dissertation introduces the disposition and maintenance of the whole solution and puts forward the defection of the system and then discusses some ameliorative solutions.