外文翻译----基于JavaServer Faces技术的酒店预订系统

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1、PDF外文：http:/  英文原文  Hotel Reservation System Based on the JavaServer Faces Technology     This paper describes implementation of web -based hotel reservation system whichenables users tobook hotel rooms by means of a web browser. The systemis based on JavaServer Faces technology

2、in thepresentation layer, Spring Framework in the service layerand iBatis library for the data access layer. I. INTRODUCTION The Hotel Reservation System is a specific type of softwarethat supports, often by means of a web browser, wholeinfrastructure of the hotel for which the system has beendeploy

3、ed. Its key features are listed below:To search and to book hotel rooms.Tonotify of every event related to a user by sending the email on a given address during the registration process. To support definition process of each component of the hotel. The components of the hotel are: rooms,promotions,

4、packages, discounts and se rvices.To complete the reservation process by notifying the system about the fact that the guest came to the hotel and received keys to the booked room. II. JAVASERVER FACES The user graphical interface is a crucial part of every computer programme with regard to its respo

5、nsibility for interaction with the users. This part of application should be flexible,which means susceptible to any needed changes and without any doubts, user friendly. Regrettably, process of developing such user interface in the main requires usually a profusion of developer's work and time,

6、 making the whole development process involved and onerous.The most apting technology to this field is JavaServer Faces (JSF). This holistic, component-based solution for longstanding problems facing software developers has a specific goal: to make web development faster and easier by masking a lot

7、of complexities hidden behind this kind of programming.JSF technology is a server-side user interface framework for Java technology-based web applications. The main components of JSF technology are as follows:     Two JavaServer Pages custom tags library for expressing UI components within

8、 a JSP page and for wiring components to server-side objects.The user interface created with JSF technology (represented by myUI on the Fig. 1) runs on the server and renders back to the client (in this case the browser).Because web-based applications, must often appease multiple clients (such as de

9、sktop browsers, cell phones, and PDAs),JSF has a powerful architecture for displaying components in different ways. As for the browsers, for which JSF is mostly used, the default rendering technology is HTML 4.0, though the others like WML or SVG are also possible.One of the greatest advantages of J

10、SF technology is that it offers a clean separation between behavior and presentation layers. III. SPRING FRAMEWORK Spring is a lightweight, inversion of control container, created to address the complexity of enterprise application development.Spring makes possible to use plain JavaBeans to achieve

11、things that were previously only possible with EJBs 10,11.Any Java application can benefit from Spring in terms of simplicity, test-ability, and loose coupling. The Spring Framework contains a lot of features, which are well-organized in seven modules. When taken as a whole, these modules give every

12、thing that is needed to develop enterprise applications, although there is no must to build the application fully on the Spring framework. One can pick and choose only those modules that suit best to the application and ignore the rest. This strategy was chosen for the Hotel Reservation System Since

13、 one of the core value propositions of the framework is that of enabling choice by not forcing one to apply any particular architecture, technology or methodology, Spring also provides convenient mechanisms for integration with number of third -party frameworks (also with JSF and iBatis). IV. APACHE

14、 IBATIS DATAMAPPER Apache iBatis JDBC based Data Mapper provides simple and flexible way to transport data between relational database and Java, .Net or Ruby application. Contrary to popular Hibernate library, iBatis does not directly tie classes to tables or fields to columns, but instead, it coupl

15、es objects with results of stored procedures or SQL statements using simple XML descriptor letting the developer to reach only for required data. The iBatis framework can map nearly any database to any object model and is very tolerant of legacy designs, or even bad designs.Simplicity is the main ad

16、vantage of the iBatis over other frameworks. The Hotel Reservation System was primarily built upon JSF technology for the user interface along with auxiliary libraries Spring and iBatis. The application architecture is presented in Fig. 3.The composition of the system is modular. Each layer is separ

17、ated with and appropriate interface layer. Such solution makes the architecture not only more error -resistant but also more flexible for changes. The presentation layer consists of the graphical user interface written in the JSF technology andunderlying backing beans objects. It communicates with t

18、he Service layer through the service interfaces.Service layer is the central business part of the system where, on the basis of the user input data, proper decisions are made. It also translates input data into explicit form understood for the Data access layer, with which communication takes place

19、by means of Data access interface layer.The Data access layer cooperates with Data Mapper layer and is responsible for data exchange with database.The Data Mapper layer talks via JDBC to database to ask required data. This is a layer where iBatis Data Mapper plays the main role. V. JSF - SPRING INTE

20、GRATION In a nutshell, JSF Spring integration makes Spring managed beans visible as variables to JSF, just as if the Spring beans are configured as JSF managed beans.Before diving into the integration specifics of JavaServer Faces,the general integration step for any web framework must be set forth.

21、All that need to be done, is to declare ContextLoaderListener in the standard JEE servlet web.xml deployment descriptor. This listener initializes the Spring's WebApplicationContext that contains all of the business beans in the application. (Fig. 4).The second step in the integration between Spring and JSF is specific just for JSF. The key class used in this process