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外文翻譯-----一種新的網(wǎng)絡(luò)應(yīng)用程序開發(fā)框架——mvc-其他專業(yè)-在線瀏覽

2025-03-24 09:05本頁面
  

【正文】 so costs more system resources. The SAX interface is famous for its high efficiency and less system resources requirements. The only disadvantage is that it obtains some information less conveniently than the DOM does. Secondly, we consider the Model Center and Model layer pletes the defined transaction logic by calling the given module. Model Database contains a mass of objects and modules. These objects and modules encapsulate the responding methods relative to specific transaction logic. When Model Center receives the transaction messages from Messenger, it selects suitable objects or modules according to the different transaction logic encapsulated in the message. Then it encapsulated the handled data in given format and delivers them to the LPM Center. Furthermore, each object or module only needs to concern how to implement the given transaction logic and how to obtain the necessary data without concerning the presentation of these data. Lastly, we concern the LPM Center and LPM Database. LPM is a set of programs to implement the presentation for a certain data type. It can correspond to a disk file or a set of disk files. On the other hand, a certain Web page can contain one logical page or multiple logical pages. To a LPM, its function is very simple: it only need to present the given data type without being notified any transaction logic and without concerning the source and content of the data. Thus, in the practical development, the LPM is developed by such technologies as label library (JSP) or data binding (.Net). Furthermore, this type of server scripts can be easily understood by the client developers during the UI (user interface) design period and can be developed by some whatyouseeiswhatyouget (WYSIWYG) tools. In this portion, LPM Center receives the data from the Model Center. It selects the suitable logical page module according to the given data type and transaction logic, then it encapsulates the output of logical page module into HTTP response and sends the response to the client. Note that among these three control objects, except SYSController,the other two do not directly access the their own kernel databases. For example, Model Center does not directly call the objects or modules in the Model Database. It implements the access through the ModelFactory class instead. (Showed in figure 2) According to the analysis of this system frame, we can see that the whole system perfectly conforms to the MVC design pattern. During the system development period, there is no distinct interactive relationship among the developers in each part. As long as the system frame is established, the development of each part can be preceded in parallel. It is impossible for the Web application developers to use this approach in the past. Because we have divided the Controller into three parts, the couplings of MVC three layers (Model/View/Controller) bee looser than ever. So it can improve the scalability of the whole system significantly. In the following section, we will show you a simple example to explain how to expand the system frame by adding intermediate transaction processes among the threelayer MVC pattern. 4. Relative problems Examining the present Web application design patterns (such as CGI, JSP MODEL 2, etc.), we can gain an elementary result: Web application system developed by MVC pattern excels the one developed by other patterns at the system logical frame, parallel cooperating development, system scalability and maintainability. It is mainly due to the deficiencies of the old design patterns on system logical frame partition. For example, in Web systems developed by CGI, the CGI programs not only need to process the transaction logic, but also are responsible for the system presentation format. Therefore, it requires the developers to have very powerful programming ability (they have to be very familiar both with the transaction programming and the interface designing). In addition, it even makes the system logic and hierarchy chaotic. At last the chaotic codes will lead into a series of problems. Using the server script languages (such as ASP, PHP, etc.) to implement Web application systems is also not satisfactory. The reason is that the script languages have innate deficiencies (for example, they do not have good object supporting and event response mechanism)。 MSMQ. . Wrox Press. [4] Sun Microsystems Inc. JavaTM Servlet and JavaServer PagesTM Spec fications. [5] Sun Microsystems Inc. JavaServer PagesTM Standard Tag Library Specification 譯文二: 網(wǎng)站建設(shè)技術(shù) * 網(wǎng)絡(luò)技術(shù)的發(fā)展 ,為今天全球性的信息交流與資在建立源共享和交往提供了更多的途徑和可能。 Inter 時代 , 造就了人們新的工作和生活方式 ,其互聯(lián)性、開放性和共享信息的模式 ,打破了傳統(tǒng)信息傳播方式的重重壁壘 ,為人們帶來了新的機遇。近幾年網(wǎng)頁設(shè)計發(fā)展 ,快得 人目不暇接。要想設(shè)計美觀實用的網(wǎng)頁就應(yīng)該深入掌握網(wǎng)站建設(shè)技術(shù)。 網(wǎng)站的定義 如何定義網(wǎng)站 確定網(wǎng)站的任務(wù)和目標(biāo) ,是建設(shè)網(wǎng)站所面臨的最重要的問題。要定義網(wǎng)站 ,首先 ,必須對整個網(wǎng)站有一個清晰認(rèn)識 ,弄清到底要設(shè) 計什么、主要的目的與任務(wù)、如何對任務(wù)進行組織與規(guī)劃。在眾多網(wǎng)站的激烈競爭中 ,高品質(zhì)的產(chǎn)品是長期競爭的最大優(yōu)勢。及時更新網(wǎng)站內(nèi)容、及時反饋用戶的要求; ( 3)首頁設(shè)計要合理。 網(wǎng)站的內(nèi)容和功能 在網(wǎng)站的內(nèi)容方面 ,就是要做到新、快、全三面。確定網(wǎng)站的內(nèi)容是根據(jù)網(wǎng)站的性質(zhì) 決定的 ,在設(shè)計政府網(wǎng)站、商業(yè)網(wǎng)站、科普性網(wǎng)站、公司介紹網(wǎng)站、教學(xué)交流網(wǎng)站等的內(nèi)容和風(fēng)格時各有不同。 * Feng Liu ,Lingling Zhang, Jifa Gu, INTERNATIONAL JOURNAL OF KNOWLEDGE AND SYSTEMS SCIENCES, Volume 4 .December 2021 網(wǎng)站的結(jié)構(gòu) ( 1)網(wǎng)站的結(jié)構(gòu); ( 2)定義導(dǎo)航; ( 3)可視化設(shè)計; ( 4)設(shè)計框架和頁面。這也就給設(shè)計者們提出了更高的要求 ,從這個角度說 ,板式設(shè)計正是滿足了人們的要求應(yīng)需而生。優(yōu)秀的網(wǎng)頁設(shè)計 ,必須有好的創(chuàng)意 ,才能使觀者視線久久難移 ,產(chǎn)生震撼力。如果想進一步認(rèn)識網(wǎng)頁設(shè)計 ,做出有別于一般網(wǎng)站的網(wǎng)頁 ,就需要掌握更多的象 CSS 、 javascript 、 CGI 等網(wǎng)頁設(shè)計技術(shù)。 應(yīng)用 CSS 設(shè)計網(wǎng)頁 (1) 什么是 CSS ? CSS 是一種樣式表 (stylesheet)技術(shù)。 (2) CSS 與 HTML 的結(jié)合方式。方式二:將 CSS 內(nèi)容單獨保存為一個文本文件 ,再由標(biāo)簽來調(diào)用。在網(wǎng)站中的頁面 ,增加了以下的定義 , 使頁面有特殊的顯示效果。從而基于 CGI 靜態(tài)的 HTML 頁面將被可 提供動態(tài)實時信息 ,并對客戶操作進行反應(yīng)的 Web 頁面的取代。它深受廣泛用戶的喜愛。與 WWW 的結(jié)合有效地實現(xiàn)了網(wǎng)絡(luò)計算和網(wǎng)絡(luò)計算機的藍圖。下面就設(shè)計和制作網(wǎng)站談?wù)勛约旱囊恍w會。網(wǎng)頁的設(shè)計類似于軟件開發(fā)的設(shè)計,有自頂向下、自底向上和不斷增 補等設(shè)計方法。系統(tǒng)設(shè)計是網(wǎng)站具體實現(xiàn)前的準(zhǔn)備
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