餐饮管理系统外文翻译文献.docx

1、餐饮管理系统外文翻译文献餐饮管理系统外文翻译文献(文档含中英文对照即英文原文和中文翻译)外文:A Comparative Study of Web Application Design ModelsUsing the Java TechnologiesAbstract. The Servlet technology has been the most widely used technology for building scalable Web applications. In the events, there are four design models for developing W

2、eb applications using the Java technologies: Model 1, Model2, Struts, and JavaServer Faces (JSF). Model 1 employs a series of JSP pages; Model 2 adopts the Model-View-Controller pattern; Struts is a framework employing the Model 2 design model; and JSF is a new technology that supports ready-to-use

3、components for rapid Web application development. Model 1 is not recommended for medium-sized and large applications as it introduces maintenance nightmare. This paper compares and evaluates the ease of application development and the performance of the three design models (Model 2, Struts, and JSF)

4、 by building three versions of an online store application using each of the three design models, respectively.1 IntroductionToday, Web applications are the most common applications for presenting dynamic contents. There are a number of technologies for building Web applications, the most popular of

5、 which is the Servlet technology . This technology gains its popularity from its superiority over other technologies such as CGI and PHP .Servlets are cumbersome to develop, however, because sending HTML tags requires the programmer to compose them into a String object and send this object to the br

6、owser. Also, a minor change to the output requires the servlet to be recompiled. To address this issue, Sun Microsystems invented JavaServer Pages (JSP) . JSP allows HTML tags to be intertwined with Java code and each page is translated into a servlet. A JSP page is a servlet. However, compilation o

7、ccurs automatically when the page is first requested. As a result, changing the output does not need recompilation. In addition, JSP enables the separation of presentation from the business logic through the use of JavaBeans and custom tag libraries. The norm now in developing Javabased Web applicat

8、ions is to use servlets along with JavaServer Pages.In the later development, there are a number of design models for building servlet/JSP applications: Model 1, Model 2, Struts , and JSF . Model 1 and Model 2 were first mentioned in the early specifications of JSP. Model 1 strictly uses JSP pages,

9、with no servlets, and Model 2 uses the combination of both servlets and JSP pages. The terms of Model 1 and Model 2 have been used ever since. Model 1 is suitable for prototypes and very small applications, and Model 2 is the recommended design model for medium sized and large applications.As Model

10、2 gained more acceptances in the industry, an open source initiative to build the Struts Framework was initiated. Struts perfects Model 2 by providing the controller part of the Model-View-Controller of Model 2. In addition, Struts provides better page navigation management and several custom tag li

11、braries for more rapid development. Despite its steep learning curve and the fact that it was never defined in any specification, Struts has been gaining popularity as the alternative to Model 2.JavaServer Faces is built under the Java Community Process under JSR-127.Sun Microsystems proposed this t

12、echnology in the hope that JSF will be the ultimate model for building Java Web applications. The most important feature of JSF is the availability of ready-to-use components such as extensible UI components, easy page navigation, input validators, data converters and JavaBeans management.The proble

13、m facing servlet/JSP programmers are to choose the most appropriate design model. Clearly, JSF provides a better solution in regard to development time. However, some people are not sanguine to adopt this technology for fear of performance penalty due to the overhead of the JSF implementation.We bui

14、ld three versions of an online store application named BuyDirect using Model 2, Struts and JSF. The parameters compared are the number of lines of code, the number of classes, and the performance measurement results. We investigate which of the design models allows the most rapid development process

15、. We evaluate the performances of the applications built upon these models. We provide some suggestions to perfect the existing design models to make development more rapid. The rest of the paper is organised as follows. Section 2 discusses the issues in Web development. Section 3 explains how the t

16、hree design models address these development issues. Section 4 provides the details of the hardware and software used in these experiments. Section 5 presents the experiment results and analysis. Section 6 reviews the related work. Section 7 concludes by offering some suggestions to improve the existing design models.2 Java Web Development Issues All Java Web development uses the Servlet technology as the underlying technology. As such, all Java Web applicat