Design And Implementation Of Tier Model Of Digital File MS For South-to-North Water Diversion Project

As the size and complexity increasingly in software systems, the design of software tier model is as important as data structure and algorithm. Now the three-layer and multi-layer architecture of browser/server pattern provides a good framework to develop the Management Information System (MIS), and Java/J2EE technologies are in the leading position for the development of multi-layer structure system. The method of analysis and design for MIS based on J2EE is elaborated based on the design and implementation of Management System of Digital File for Management Organization of South-to-North Water Diversion Project in this thesis.The background, purposes and significance of this thesis is expatiated firstly. The development of the management of integration of files and archives and the relative theories are generalized, and then the development process and current application state of information system are introduced. Then the thesis analyzes the systems of file management which are widely used at present, and then presents the character and advantage of file management system designed in this thesis. And the structure of the thesis is introduced.Then the overall structure of the Digital File Management System is designed based on the user's requirement and the requirement of putting on file in the phase of analysis and design. And the tier model of the system is presented based on J2EE structure and the design mode of MVC. By taking the module of file registering as an actual example, the method of how to design and implement of the presentation layer, persistence layer and business layer are elaborated. Then the development and runtime environment are introduced briefly.In order to keep the security and manage the privilege dynamically, the technology of privilege control based on"user-object-operation"is designed in this thesis considering the feature of J2EE Tier Model and the feature of file management of the Construction and Administration Bureau of South-to-North Water Diversion Middle Route Project, and then implemented. Finally the thesis makes a summary and research prospect.