外文翻譯---一種基于hibernate、struts和spring的j2ee應(yīng)用開(kāi)發(fā)框架-其他專業(yè)-資料下載頁(yè)
2025-01-19 09:17本頁(yè)面
【導(dǎo)讀】臺(tái)得到了長(zhǎng)足的發(fā)展。借助于J2EE規(guī)范中包含的多項(xiàng)技術(shù)：Enterprise. MessageService等，開(kāi)發(fā)出了許多應(yīng)用系統(tǒng)。數(shù)據(jù)模型和邏輯模型之間的矛盾。目前使用的數(shù)據(jù)庫(kù)基本上都是關(guān)系型。JDBC進(jìn)行數(shù)據(jù)庫(kù)操作，降低了編程的效率以及系統(tǒng)的可維護(hù)性；企業(yè)應(yīng)用，但是使用EJB容器進(jìn)行開(kāi)發(fā)和調(diào)試需要耗費(fèi)大量時(shí)間。它不僅提供了從Java類到數(shù)據(jù)表的映射，也提供了數(shù)據(jù)。查詢和恢復(fù)機(jī)制。提高實(shí)現(xiàn)的效率。承及包含等關(guān)系。通過(guò)使用HQL語(yǔ)句將復(fù)雜的關(guān)系算法用對(duì)象的方式描述，在很。而直觀的API，用于對(duì)數(shù)據(jù)庫(kù)所表示的對(duì)象執(zhí)行查詢。要?jiǎng)?chuàng)建或修改這些對(duì)象，只需在程序中與它們進(jìn)行交互，然后告訴Hibernate保存即可。及特定形式展示給用戶。同的顯示形式或視圖。其職責(zé)是控制提供模型中任何變化的傳播，確保用戶界面于模型間的對(duì)應(yīng)聯(lián)系；和視圖協(xié)調(diào)工作的部件。MVC的各項(xiàng)特性，并根據(jù)J2EE的特點(diǎn)，做了相應(yīng)的變化與擴(kuò)展。中控制器角色的是ActionServlet。在Struts框架中，視圖主要由JSP生成頁(yè)面完成，良好的構(gòu)架的web應(yīng)。這個(gè)框架的的設(shè)計(jì)
【正文】 ation and form population in the view. Thus, reference data needs to be modelled as bean properties of the Action too. Regarding views: Spring39。s view resolution is extremely flexible. A Controller implementation can even write a view directly to the response, returning null as ModelAndView. In the normal case, a ModelAndView instance consists of a view name and a model Map, containing bean names and corresponding objects (like a mand or form, reference data, etc). View name resolution is highly configurable, either via bean names, via a properties file, or via your own ViewResolver implementation. The abstract model Map allows for plete abstraction of the view technology, without any hassle: Be it JSP, Velocity, or anything else every renderer can be integrated directly. The model Map simply gets transformed into an appropriate format, like JSP request attributes or a Velocity template model. If you don39。t want to use Spring39。s web MVC but intend to leverage other solutions that Spring offers, you can integrate the web framework of your choice with Spring easily. Simply start up a Spring root application context via its ContextLoaderListener, and access it via its ServletContext attribute (or Spring39。s respective helper method) from within a Struts or WebWork action. Note that there aren39。t any plugins involved, therefore no dedicated integration: From the view of the web layer, you39。ll simply use Spring as a library, with the root application context instance as entry point. All your registered beans and all of Spring39。s services can be at your fingertips even without Spring39。s web MVC. Spring doesn39。t pete with Struts or WebWork in this usage, it just addresses the many areas that the pure web frameworks don39。t, from bean configuration to data access and transaction handling. So you are able to enrich your application with a Spring middle tier and/or data access tier, even if you just want to use . the transaction abstraction with JDBC or Hibernate. If just focussing on the web support, some of Spring39。s unique features are: .Clear separation of roles: controller vs validator vs mand object vs form object vs model object, DispatcherServlet vs handler mapping vs view resolver, etc. .Powerful and straightforward configuration of both framework and application classes as JavaBeans, including easy inbetween referencing via an application context, . from web controllers to business objects and validators. .Adaptability, nonintrusiveness: Use whatever Controller subclass you need (plain, mand, form, wizard, multi action, or a custom one) for a given scenario instead of deriving from Action/ActionForm for everything. .Reusable business code, no need for duplication: You can use existing business objects as mand or form objects instead of mirroring them in special ActionForm subclasses. .Customizable binding and validation: type mismatches as applicationlevel validation errors that keep the offending value, localized date and number binding, etc instead of Stringonly form objects with manual parsing and conversion to business objects. Customizable handler mapping, customizable view resolution: flexible model transfer via name/value Map, handler mapping and view resolution strategies from simple to sophisticated instead of one single way. With in the J2 the EE the application very widespread customer register process for example, elucidation abovementioned system structure is how concrete usage. The process of register is very clear: Customer from register page importation register information, system to register the information carry on verification, if exactitude success register, otherwise hint correspond mistake information. In the development process, the usage Eclipse be used as development environment and added to carry to provide to the Struts and the Hibernate in the meantime better control and support of three square plugin MyEclipse, Web server usage Tomcat, the database chose to use Mysql. Carry on an allocation to the Hibernate first, need to the system auto the born . xml carry on modification, allocation good database conjunction of various parameter and definition the data reflect to shoot a document. Because the Hibernate take of conjunction pond main used for test, the function isn39。t very good, can pass JNDI will it modification is usage Tomcat of conjunction pond.
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