Research And Application On Web System Based On Distributed Object

Distributed object technology that occurred in 90's provides a strongly solution for the development of network software. Distributed computing technology is to develop, deploy, manage and maintain distributed application system whose main application goal is to implement resource share and cooperative work on the network computing platform. Now, distributed object technology has become the core technology of building service application framework and software component. It shows great life-force in developing large distributed application systems.With the development and popularity of Internet, Web based Browser/Server application system came into being and is swiftly developing. Although current Web technology is of some unique merits, it still can't complete large-scale enterprise computing. The main problem is that system requires HTTP and Web Server as agency to correspond the communication of application server and client. This must cause the flux bottleneck that will slower the response speed on Web Server. Meanwhile distributed object technology allows mutual information communications among objects on different machines. Hence the combination of Web technology and distributed object technology can solve above problem. It will make client call application object cross the Web Server and improve the performance of the system. The integration of Web technology and distributed object technology is the development trend of Web system.This paper focuses on Web Research and Application on Web system based on distributed object. The main contributions of this thesis is described as following:1. Introduces distributed object technology, deeply studies the 3 mainstream technologies: COM/DCOM technology, J2EE/EJB technology and COBRA technology, then analyzes and compares the 3 technologies.2. Analyzes the Web application system architecture, according to the disadvantage of current Web system architecture,.proposes and analyzes Web application system architecture based on distributed object technology integrating distributed object technology.3. Introduces the CSCW technology, analyzes the basic features, typical structure and some key technologies of CSCW. Constructs a Web applicationsystem------Web conference system which is a representative application ofCSCW technology based on distributed object technology------J2EE architecture.Analyzes the system architecture, the function and the principle of Web conference system, introduces the key technologies adopted in this system. This system uses IMS, JNDI, JDBC, EJB etc. technologies, implements real message asynchronism transfer of many conference members via Subscribe/Publish of IMS technology.