Data Transmission Key Technology Research And Implementation Of Mobile Campus System

With the rapid development of computer technology and communicationtechnology, the world has entered a period of vigorous development of the mobileInternet. In recent years, the type and the number of mobile intelligent terminals areincreased dramatically, mobile portals, information sharing, instant messaging, audioand video entertainment, information sharing, customization features such as growing,greatly promoted the development of mobile Internet, it became an important assistantin people’s daily work and life. Mobile terminal is now becoming more and morepowerful,80percent of college students have a system based on Android and IOSsmartphones. Administrators, teachers, students and other school personnel can learnthe news, announcements and query operations such as personal related informationservices anytime and anywhere through mobile campus system platform, mobilecampus system came into being in such an atmosphere.Based on these requirements, the realization of having a "unified portal, resourcerepository, online communication, assist office" function system. The module includesfour parts: basic public service module, the service module management, teaching andresearch module, student services module. Integration of all resources of mobilecampus system, administrators, students and teachers can access the campus networkinformation search and management through the mobile terminal, and allows schooladministrators publish information anytime, anywhere on campus, online work,improving school administrators, teachers students work efficiency. And fixed at thetime of the campus network performance is poor or fails, move the campus networksecurity system has been able to recover in time. The main application is the keytechnologies: Mobile middleware technology, Web Services technology, singlesign-on technology.1.By phone middleware technology to achieve the separation of the networkinformation gathered together the role of information users to grab the focus ofattention from the network formed XML documents, mobile client uses SAX parsingtechnology, the XML document parsing adapted to the mobile terminal, simplify theuser’s query time information to make better utilization of the user’s time.2.Through the application Web Services technology to isolated resourceinformation system interface, unification, application Web Services service interface,the resource sharing of information can not be extracted form the interface by callingthe service interface, operation of the database information, the purpose of sharingresources.3.By using a single sign-on technology applications in different subsystems onlyneed one login, you can access information about other subsystems, each subsystemdoes not require a separate login. At the bottom there is a unified server-sideauthentication module in Android mobile terminal controls implemented by SharePreferences store login information sharing.Considering the universal data transmission formats, this thesis XML format fortransmission of data, but the disadvantage of this format is the label redundancy forshortcoming, this thesis proposes a new idea XML data transmission, mainly LZ77algorithm and self-combined with the definition of the data transfer protocol toimprove the response speed of the client program. The main innovation of this article:1.For redundancy tag defines a MAP object stores all labels and integer mappingtable, the data portion of the structure of XML documents and partial separation wereprocessed and re-grouping of the data content, the associated data classified with alabel item, for these are under the same label data entry alone LZ77compressionalgorithm. XML tags for the custom mapping table based on its integer encodingcompression.2.Consume excessive traffic and transport problems of slow communications formobile applications, this thesis presents data transfer LZ77compression algorithmbased on a custom data transfer protocol that XML-based redundant labelcompression, reducing the volume flow rate and thus achieve a lower transmissiontime consuming problem.3.In order to avoid unnecessary data transfer, faster response speed of the mobileterminal, the thesis presents a simple method for simultaneous transmission of data.On the server side and the mobile terminal are maintaining a list of MD5hash,provided by the server when the user requests data, MD5list traversal server, serverand mobile side comparison of the two lists MD5hash, MD5hash if both ends of theagreement on the record jump However, otherwise, to obtain the latest data from theserver is stored in a local database, thus avoiding the transmission of unnecessarydata.This thesis describes the construction and implementation of mobile applicationsfrom the campus construction ideas, implementation and deployment of innovativepractices and other aspects. Network communication bandwidth issues campus systemfor mobile data transmission process a large amount of redundant data transmissionstructure brought thesis campus system for mobile data transmission protocols andcompression algorithms made a detailed analysis and research.