基于AJAX和J2EE的WebGIS分布式系统设计与实现

Design and realization of distributed WebGIS platform based on AJAX and J2EE

由于传统WebGIS设计方法的局限性,网络应用的交互性能一直难以有所提升,同时各流行WebGIS平台价格也比较昂贵。利用最新流行的面向异步消息通讯机制的网络应用客户端AJAX技术结合J2EE设计和实现了一套四层体系结构的分布式WebGIS系统。并就该系统,分别探讨了与其相关的客户端技术、服务器端技术、系统构架、设计目标、所使用的关键技术等问题。目前该系统能够发布多种图形格式和自定义格式的图形,实现了WebGIS通用功能,能够应用于电子地图发布等相关领域。

As a result of the limitation of traditional WebGIS design, the interactivity of web application arc restricted by browser. Simultaneously, the cost of popular WebGIS platform is expensive. AJAX is the latest technology of construction of asynchronous mes- saging based on web application. By making use of AJAX and J2EE, one kind of four-tier distributed web-system is proposed and a- chieved In view of this system, these technologies, which include Client-Side technology, Server-Side technology, system skeleton, system objective, dtata model, core technology and so on, are discussed. Now the system can publish many kinds of graph file including the definition graph file, moreover the general function of WebGIS is achieved, which can apply in the related domain of electronic map.