外文翻譯---基于web服務(wù)的無線食品點(diǎn)菜系統(tǒng)-其他專業(yè)-wenkub
2023-01-30 09:28:29 本頁面
【正文】 us . Using electromagic waves, WLANs transmit and receive data over the air, minimizing the need for wired connections. Thus, WLANs bine data connectivity with user mobility, and, through simplified configuration, enable movable LANs. The IEEE group of standards specifies the technologies for wireless LANs. standards use the Ether protocol and CSMA/CA (carrier sense multiple access with collision avoidance) for path sharing and include an encryption method, the Wired Equivalent Privacy algorithm. The , b, and g standards are the most mon for home wireless access points and large business wireless systems. A remote user can use WLAN to access the Inter through public access points (“hotspots”) provided by service providers. When in the office, they may access WLAN through wireless access points. In enterprise environments, WLANs are usually plemented by security mechanisms, such as VPN (Virtual Private Network). Over the last several years, WLANs have gained strong popularity in some markets, including the healthcare, retail, manufacturing, and academic areas. These industries have profited from the productivity gains of using handheld terminals and notebook puters to transmit realtime information to centralized hosts for processing. Today WLANs are being more widely recognized as a generalpurpose connectivity alternative for a broad range of business customers. B. Web Services Quickly being a significant technology in the evolution of the Inter is web services, a set of standards that can interconnect systems over a verity of works. It is an open XMLbased technology providing a generic data exchange format and has been rapidly adopted by many vendors. Web services can easily be built upon existing applications, no matter what the underlying technology is. Because they are expected to have a growing familiarity and acceptance among many users and offer great technological promises, Web services are an interesting subject for the investigation of their possible application in many systems . Web services are a new generation of web application. It bines the advantages of the ponentoriented methods and web techniques, and they can describe its own service. It can also publish, locate and transfer modularized application in web. The provided functions of web services may be simple, but it also contains extraordinary plicated business logic. Web services represent a kind of implementation of SOA (ServiceOriented Architecture), and they are the most popular one. In addition, the three operations of SOA can only process when the ponents of SOA interact. Therefore some standardized techniques are used in web services, including UDDI, WSDL, HTTP, SOAP, and XML and so on. Web services bee the best choice for developing application of SOA . III. DESIGN AND I MPLEMENTATION OF THE SYSTEM A. System Architecture In the system, we adopt fourtiered webbased clientserver architecture. Figure 1 shows the overview of the system architecture. The system is conceptually posed of six main ponents: the web server, database server, cash register, mobile context server, mobile user and desktop user. The web server provided relevant information fo
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