The Design And Implementation Of Distributed Charging System

With the development of computer, it is gradually applied to build information systems to solve the traditional industry' businesses. In the period of the development of information systems, their designs changed from the beginning C/S architecture to three-tier architecture (clients, application server, background database), this two architectures mostly applied in the LAN. Now distributed system becomes the most popular, it can also be applied in the LAN, also can be applied in the WAN, the connection among the nodes of distributed systems is transparent, the system can execute the task that the exterior submits at every node, the execution is transparent to the exterior. Every time the system architecture has changed, it can bring the high efficiency, so this paper bases on an existing three-tier charging system which is applied in the LAN, designs and implements a distributed system that can be applied in the WAN. The new distributed charging system can implement all the up to date businesses, it had added multi-node in the system to implement business, so it forms a distributed system from the three-tier system by making the nodes relate between each other in the WAN.This paper analyses many most popular distributed object technologies, after compares them, selects the technology of Java RMI to implement the system. Using Java RMI to implement system, the realization process is simple, and in the Java language it provides many methods of serialization, it makes the nodes communicate each other easily in the process of the realization. The difficulties to implement this system are that: making the existing three-tier system a single node and making the nodes communicate with each other. The system emphasizes on designing the interfaces between each nodes, makes the nodes communicate with each other, and can submit and finish a task in every node.This distributed charging system realizes all the functions of the former system, primely substitutes the former system, and improves the expansibility and the efficiency of execution, adapts the development of the business well, the realization of this system also accumulates practical experience for our lab to build an universal distributed model.