Based On J2ee For Webgis Applications

By digital implementation Geographical Information System (GIS) reflects the earth spatial data and property data on which people depend to survive. GIS supports spatial data and property data's input, output, storage, display, inquiry, general analysis and assistant decision-making. With the development of Internet technology and brought forword of concept of digital earth, traditional GIS is running to WebGIS that may share information. WebGIS is an organic combination of GIS technology and Internet technology; its application fields expand from expert system to all aspects of society and WebGIS has become a popular information tool.J2EE is an architecture that makes use of Java 2 platform to simplify enterprise resolvent's development, deployment, management and some relevant problems. J2EE architecture provides an n-tier framework to satisfy application requirements with low cost, high usability, high reliability and extensibility. Providing uniform development platform, J2EE reduces expenditure and complexity of developing an n-tier application, and at the same time J2EE supports integration with current application strongly. Developing WebGIS using J2EE may bring its advantage into play fully, and implements a WebGIS application with n-tier, modularization, extensibility, easy- migration and high independence of platform.The paper expounds WebGIS's architecture, computing models and realizing methods, at the same time deeply researches and discusses J2EE architecture and its pivotal technologies in implementing WebGIS application, and introduces MapXtreme for Java's relevant technology and realization method, finally designs and implements a WebGIS application based on J2EE according to users' requirements.