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java設(shè)計模式與j2ee設(shè)計模式-全文預(yù)覽

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【正文】 決定處理此請求。. Command—命令模式俺有一個MM家里管得特別嚴(yán),沒法見面,只好借助于她弟弟在我們倆之間傳送信息,她對我有什么指示,就寫一張紙條讓她弟弟帶給我。命令模式允許請求的一方和發(fā)送的一方獨(dú)立開來,使得請求的一方不必知道接收請求的一方的接口,更不必知道請求是怎么被接收,以及操作是否執(zhí)行,何時被執(zhí)行以及是怎么被執(zhí)行的。客戶端可以使用這個解釋器來解釋這個語言中的句子。每一個命令對象都有一個解釋方法,代表對命令對象的解釋。多個對象聚在一起形成的總體稱之為聚集,聚集對象是能夠包容一組對象的容器對象。迭代算法可以獨(dú)立于聚集角色變化。當(dāng)某些對象之間的作用發(fā)生改變時,不會立即影響其他的一些對象之間的作用。. Memento—備忘錄模式同時跟幾個MM聊天時,一定要記清楚剛才跟MM說了些什么話,不然MM發(fā)現(xiàn)了會不高興的哦,幸虧我有個備忘錄,剛才與哪個MM說了什么話我都拷貝一份放到備忘錄里面保存,這樣可以隨時察看以前的記錄啦。這個主題對象在狀態(tài)上發(fā)生變化時,會通知所有觀察者對象,使他們能夠自動更新自己。狀態(tài)模式把所研究的對象的行為包裝在不同的狀態(tài)對象里,每一個狀態(tài)對象都屬于一個抽象狀態(tài)類的一個子類。. Strategy—策略模式跟不同類型的MM約會,要用不同的策略,有的請電影比較好,有的則去吃小吃效果不錯,有的去海邊浪漫最合適,單目的都是為了得到MM的芳心,我的追MM錦囊中有好多Strategy哦。環(huán)境類負(fù)責(zé)維持和查詢行為類,各種算法在具體的策略類中提供。先制定一個頂級邏輯框架,而將邏輯的細(xì)節(jié)留給具體的子類去實(shí)現(xiàn)。訪問者模式使得增加新的操作變的很容易,就是增加一個新的訪問者類。2. J2EE設(shè)計模式. 表示層模式. Intercepting Filter—攔截過濾器模式ContextThe presentationtier request handling mechanism receives many different types of requests, which require varied types of processing. Some requests are simply forwarded to the appropriate handler ponent, while other requests must be modified, audited, or unpressed before being further processed.ProblemPreprocessing and postprocessing of a client Web request and response are required.When a request enters a Web application, it often must pass several entrance tests prior to the main processing stage. For example,Has the client been authenticated? Does the client have a valid session? Is the client39。 it provides an abstraction for, and thus hides, the implementation of the business services. Using a Business Delegate reduces the coupling between presentationtier clients and the system39。s progress through the site. System services and view management logic are relatively sophisticated. SolutionUse a controller as the initial point of contact for handling a request. The controller manages the handling of the request, including invoking security services such as authentication and authorization, delegating business processing, managing the choice of an appropriate view, handling errors, and managing the selection of content creation strategies.The controller provides a centralized entry point that controls and manages Web request handling. By centralizing decision points and controls, the controller also helps reduce the amount of Java code, called scriptlets, embedded in the JavaServer Pages (JSP) page.Centralizing control in the controller and reducing business logic in the view promotes code reuse across requests. It is a preferable approach to the alternativeembedding code in multiple viewsbecause that approach may lead to a more errorprone, reusebycopy andpaste environment.Typically, a controller coordinates with a dispatcher ponent. Dispatchers are responsible for view management and navigation. Thus, a dispatcher chooses the next view for the user and vectors control to the resource. Dispatchers may be encapsulated within the controller directly or can be extracted into a separate ponent.While the Front Controller pattern suggests centralizing the handling of all requests, it does not limit the number of handlers in the system, as does a Singleton. An application may use multiple controllers in a system, each mapping to a set of distinct services.. View Helper—視圖助手模式ContextThe system creates presentation content, which requires processing of dynamic business data.ProblemPresentation tier changes occur often and are difficult to develop and maintain when business data access logic and presentation formatting logic are interwoven. This makes the system less flexible, less reusable, and generally less resilient to change.Intermingling the business and systems logic with the view processing reduces modularity and also provides a poor separation of roles among Web production and software development teams.ForcesBusiness data assimilation requirements are nontrivial. Embedding business logic in the view promotes a copyandpaste type of reuse. This causes maintenance problems and bugs because a piece of logic is reused in the same or different view by simply duplicating it in the new location. It is desirable to promote a clean separation of labor by having different individuals fulfill the roles of software developer and Web production team member. One view is monly used to respond to a particular business request. SolutionA view contains formatting code, delegating its processing responsibilities to its helper classes, implemented as JavaBeans or custom tags. Helpers also store the view39。當(dāng)使用訪問者模式時,要將盡可能多的對象瀏覽邏輯放在訪問者類中,而不是放到它的子類中。一旦這些操作需要修改的話,接受這個操作的數(shù)據(jù)結(jié)構(gòu)可以保持不變。. Template Method—模板方法模式看過《如何說服女生上床》這部經(jīng)典文章嗎?女生從認(rèn)識到上床的不變的步驟分為巧遇、打破僵局、展開追求、接吻、前戲、動手、愛撫、進(jìn)去八大步驟(Template method),但每個步驟針對不同的情況,都有不一樣的做法,這就要看你隨機(jī)應(yīng)變啦(具體實(shí)現(xiàn));模板方法模式準(zhǔn)備一個抽象類,將部分邏輯以具體方法以及具體構(gòu)造子的形式實(shí)現(xiàn),然后聲明一些抽象方法來迫使子類實(shí)現(xiàn)剩余的邏輯。策略模式使得算法可以在不影響到客戶端的情況下發(fā)生變化。狀態(tài)模式需要對每一個系統(tǒng)可能取得的狀態(tài)創(chuàng)立一個狀態(tài)類的子類。狀態(tài)模式允許一個對象在其內(nèi)部狀態(tài)改變的時候改變行為。備忘錄模式的用意是在不破壞封裝的條件下,將一個對象的狀態(tài)捉住,并外部化,存儲起來,從而可以在將來合適的時候把這個對象還原到存儲起來的狀態(tài)。調(diào)停者模式將多對多的相互作用轉(zhuǎn)化為一對多的相互作用。調(diào)停者模式包裝了一系列對象相互作用的方式,使得這些對象不必相互明顯作用。迭代子模式簡化了聚集的界面。. Iterator—迭代子模式我愛上了Mary,不顧一切的向她求婚。在解釋器模式里面提到的語言是指任何解釋器對象能夠解釋的任何組合。. Interpreter—解釋器模式俺有一個《泡MM真經(jīng)》,上面有各種泡MM的攻略,比如說去吃西餐的步驟、去看電影的方法等等,跟MM約會時,只要做一個Interpreter,照著上面的腳本執(zhí)行就可以了。”,命令模式把一個請求或者操作封裝到一個對象中。處理者有兩個選擇:承擔(dān)責(zé)任或者把責(zé)任推給下家。代理模式可以并不知道真正的被代理對象,而僅僅持有一個被代理對象的接口,這時候代理對象不能夠創(chuàng)建被代理對象,被代理對象必須有系統(tǒng)的其他角色代為創(chuàng)建并傳入。代理模式給某一個對象提供一個代理對象,并由代理對象控制對源對象的引用。將可以共享的狀態(tài)和不可以共享的狀態(tài)從常規(guī)類中區(qū)分開來,將不可以共享的狀態(tài)從類里剔除出去。享元模式能做到共享的關(guān)鍵是區(qū)分內(nèi)蘊(yùn)狀態(tài)和外蘊(yùn)狀態(tài)。. Flyweight—享元模式每天跟MM發(fā)短信,手指都累死了,最近買了個新手機(jī),可以把一些常用的句子存在手機(jī)里,要用的時候,直接拿出來,在前面加上MM的名字就可以發(fā)送了,再不用一個字一個字敲了。外部與一個子系統(tǒng)的通信必須通過一個統(tǒng)一的門面對象進(jìn)行。動態(tài)給一個對象增加功能,這些功能可以再動態(tài)的撤消。合成模式就是一個處理對象的樹結(jié)構(gòu)的模式?!薄斑@件T恤挺漂亮,買,這條裙子好看,買,這個包也不錯,買。不要問我“早上碰到MM新做了個發(fā)型怎么說”這種問題,自己用BRIDGE組合一下不就行了將抽象化與實(shí)現(xiàn)化脫耦,使得二者可以獨(dú)立的變化,也就是說將他們之間的強(qiáng)關(guān)聯(lián)變成弱關(guān)聯(lián),也就是指在一個軟件系統(tǒng)的抽象化和實(shí)現(xiàn)化之間使用組合/聚合關(guān)系而不是繼承關(guān)系,從而使兩者可以獨(dú)立的變化。. Singleton—單例模式俺有6個漂亮的老婆,她們的老公都是我,我就是我們家里的老公Sigleton,她們只要說道“老公”,都是指的同一個人,那就是我(剛才做了個夢啦,哪有這么好的事)單例模式確保某一個類只有一個實(shí)例,而且自行實(shí)例化并向整個系統(tǒng)提供這個實(shí)例單例模式。. Prototype—原始模型模式跟MM用聊天,一定要說些深情的話語了,我搜集了好多肉麻的情話,需要時只要copy出來放到里面就行
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