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Design and Implementation of Versatile Data Gateway in Web Based Service System

Author: HuangXiaoKe
Tutor: ChenXiuQuan
School: Dalian Maritime University
Course: Management Science and Engineering
Keywords: Data Gateway GPS terminal XML application GPS communication software
CLC: TP393.05
Type: Master's thesis
Year: 2011
Downloads: 41
Quote: 0
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Abstract


Web location service system is to collect the mobile terminal location and status information, and displayed to the user on the electronic map, and position monitoring in this feature based on the trajectory of history, mileage, area alarm, camera and a series of services. Mobile terminal as an important part of the Web services play a collection of field data, send data and receive instructions. Data through a wireless network to the Internet, eventually after the data gateway formatted storage in the database. Data gateways translate different protocol format data, format stored in the database, on the other hand for the send to different terminal or terminal communication protocol initiative Reply to meet the directive. Gateway protocol processing process is essentially similar, but for parsing implementation of the protocol, different protocols require different procedures. When the new terminal requires access to the system need to be designed the corresponding data gateway to be integrated into the system. However, analysis of the protocol of each terminal, substantially similar to the protocol represented by the data and communication processes. So the development of a common data gateway to communication and GPS terminal. This article is in the first place according to the Web location services needs to successfully design and implement a single data gateway. Commonalities and differences in the analysis of the communication protocol of the respective GPS terminal, the similar parts extracted, to design a description protocol XML file design be able to resolve a variety of terminal common data gateway, and then according to the XML file. XML file using the same template, so as long as the application can adapt to the XML template, that is, to achieve the universal. Different GPS terminals using the same XML template. By creating a new XML file for a new terminal, and increase the value of nodes and node attributes to represent its GPS communication protocol, then the XML file is added to the system. When receiving an instruction, program intelligence to find XML nodes to describe this directive. Parse out the corresponding data items in the data stream based on the node information. If this directive with replies instruction, the program automatically match a Reply directive to the terminal. In order to achieve universal access to a variety of terminal data gateway. The communication protocol of the terminal using the XML file describes also a relatively complicated process, so in the XML file discarded relatively large differences between the instruction, and describes only the most basic instruction to be able to meet the terminals log into the system and parse the terminal location information. Common Gateway parsed only for a certain type of terminal. Reason why the Common Gateway demand is non-standard communication protocols because the GPS terminal manufacturers, communication protocols using standard protocols, then it does not need a universal data gateway, it is recommended that as soon as possible to develop GPS terminal communication protocol .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Computer network > General issues > Network equipment
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