簡介:譯文譯文一種新的網(wǎng)絡(luò)應(yīng)用程序開發(fā)框架一種新的網(wǎng)絡(luò)應(yīng)用程序開發(fā)框架MVCMVC摘要摘要MVCMODEL/VIEW/CONTROLLER的設(shè)計模式出現(xiàn)在在SMALLTALK80,并在軟件的設(shè)計中廣泛應(yīng)用。本文介紹一種基于MVC框架的的新網(wǎng)絡(luò)應(yīng)用程序。這種框架把實施邏輯與表現(xiàn)形式獨立開來。它也提高了系統(tǒng)的可維護性,可擴展性以及使用模塊數(shù)據(jù)庫備案、模板數(shù)據(jù)庫,通訊對象和緩沖隊列的性能。關(guān)鍵詞MVC、設(shè)計模式、網(wǎng)絡(luò)應(yīng)用程序11簡介簡介網(wǎng)絡(luò)應(yīng)用系統(tǒng)是一個基于BROWSER/SERVER模型應(yīng)用系統(tǒng)。它利用多種動態(tài)網(wǎng)頁開發(fā)技術(shù)。目前,軟件設(shè)計的主題之一是網(wǎng)絡(luò)應(yīng)用開發(fā)模式和工具的。它們直接影響系統(tǒng)的幾個關(guān)鍵因素,比如可維護性、可擴展性、穩(wěn)定性和安全性。本文中,基于MVC1的網(wǎng)絡(luò)應(yīng)用程序的設(shè)計模式是為解決這兩類因素擴展性和可維護性這些不易處理的問題。把MVC設(shè)計模式引入網(wǎng)絡(luò)應(yīng)用程序開發(fā),執(zhí)行邏輯可以獨立于系統(tǒng)的表現(xiàn)形式。MVC由三種對象組成。1模型是應(yīng)用對象,2視圖是它的屏幕的顯示,3控制器定義用戶界面并對輸入的信息做出響應(yīng)。在出現(xiàn)MVC之前,用戶界面的設(shè)計傾向于把這些東西做在一起。然而,MVC獨立了它們,增加系統(tǒng)的靈活性和可重用性。MVC把視圖和模型獨立開來,在它們之間建立了“SUBSCRIBE/NOTIFY”協(xié)議。一個視圖必須確保其正確反映模型的狀態(tài)。每當(dāng)模型的數(shù)據(jù)發(fā)生改變,視圖會得到相應(yīng)的通知。作為回應(yīng),每個視圖都會有更新自身的機會。這個方法可以讓你附上一個模型的多個視圖以便提供不同的報告。你也可以不改變原模型同時創(chuàng)建新的視圖。22背景和存在的問題背景和存在的問題雖然MVC的設(shè)計模式已經(jīng)在SMALLTALK80中提出了,并廣泛應(yīng)用于軟件設(shè)計,介紹它到網(wǎng)頁應(yīng)用程序開發(fā)卻仍很困難的。主要由于以下兩個因素1首先,很難獨立來自HTML的編程語言。早期的CGI程序使用字符串輸出創(chuàng)造了HTML內(nèi)容。默認(rèn)的,將HTML文本分成幾份,然后把他們嵌入到CGI程序中。腳本語言出現(xiàn)后,變成了腳本語言編寫的程序嵌入到HTML文本中。然而,這兩種方法有一個共同的不足,使他們不能完全獨立于HTML文本。因此,這兩種方法使采用MVC分離三層模式十分難以實現(xiàn)。2第二,腳本語言的功能太弱。他們?nèi)狈σ恍┍匾募夹g(shù)支持來采用MVC的設(shè)計模式,如消息機制和事件回應(yīng)機制。直到JSPMODEL2版,這種情況2需要DOM解析器分析整個數(shù)據(jù)庫備案后載入內(nèi)存。數(shù)據(jù)庫將保留在內(nèi)存中的DOM樹結(jié)構(gòu)。另一種是使用SAXSIMPLEAPIFORXML接口。兩者有各自的優(yōu)缺點。使用DOM可以實現(xiàn)結(jié)構(gòu)搜索。它可以在大型數(shù)據(jù)庫上使用,但是會暫用更多的系統(tǒng)資源。而SAX接口以高效率和更少的系統(tǒng)資源占用率著稱。唯一的缺點是它獲得信息比DOM難。其次,我們考慮模型中心和模型數(shù)據(jù)庫。該層通過調(diào)用給定模塊完成定義執(zhí)行邏輯。模型數(shù)據(jù)庫包括大量的對象和模塊。這些對象和模塊根據(jù)特定的執(zhí)行邏輯封裝響應(yīng)方法。當(dāng)模式中心接收到的執(zhí)行消息,它根據(jù)封裝在信息里的執(zhí)行邏輯選擇合適的對象或模塊。然后按照給定的數(shù)據(jù)格式封裝模塊,冰傳輸給LPM中心。此外,每個對象或模塊只需要關(guān)心如何實現(xiàn)給定的事務(wù)的邏輯以及如何獲得必要的數(shù)據(jù)而不提交這些數(shù)據(jù)。最后,我們研究一下LPM中心和LPM數(shù)據(jù)庫。LPM是實施描述的某一種數(shù)據(jù)類型的項目集合,它可以當(dāng)成是一個或一組磁盤文件。在另一方面,有一個網(wǎng)頁可有一個邏輯頁或多條邏輯頁。一個LPM的功能是很簡單的它只需要在沒有被得到執(zhí)行邏輯和原數(shù)據(jù)內(nèi)容的情況下給定數(shù)據(jù)類型。因此事實上,LPM是作為標(biāo)簽庫JSP或數(shù)據(jù)捆綁NET而開發(fā)的。此外,這種類型的服務(wù)器腳本可以很容易由客戶開發(fā)人員在UIUSERINTERFACE設(shè)計階段理解,WHATYOUSEEISWHATYOUGET所見即所得工具也很容易開發(fā)。在這部分,LPM中心從模型中心收到數(shù)據(jù)。它根據(jù)給定數(shù)據(jù)類型和執(zhí)行邏輯選擇適當(dāng)?shù)倪壿嬳撃K,然后封裝邏輯頁的輸出模塊到HTTP響應(yīng)并將發(fā)布到客戶端。注意到這3個控制對象,除了SYSCONTROLLER,另外兩個不是直接進入自己的核心數(shù)據(jù)庫。例如,模式中心不直接從模型數(shù)據(jù)庫調(diào)用對象或模塊。它實現(xiàn)了通過MODELFACTORY的存取。(過程見圖2)通過分析系統(tǒng)框架,可以看出整個系統(tǒng)完全符合MVC設(shè)計模式。在在系統(tǒng)的開發(fā)時期各部分的開發(fā)者三者冰不具有相互的干涉。當(dāng)系統(tǒng)框架已確定,各部分驚人的發(fā)現(xiàn)開發(fā)的相似。在過去這對網(wǎng)絡(luò)應(yīng)用程序的開發(fā)來說是不可能的。因為我們已經(jīng)把控制器分為3個部分,MVC三層模型/
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上傳時間:2024-03-16
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簡介:FIRSTCOMPLIANCEREVIEWOFTHEAPPLICATIONOFTHEAPPRAISALCOMMITTEE,ONLYTHROUGHTHECOMPLIANCEREVIEWOFTHEAPPLICATIONTOTAKEPARTINADETAILEDREVIEW81APPLICATIONCOMPLIANCEREVIEWDOESNOTMEETONEOFTHEFOLLOWINGCONDITIONS,PROCURATORIALAGENCYTOSUBMITAPPLICATIONTHROUGHCOMPLIANCEREVIEWS,BEINVALIDATED1APPLICATIONOFTHEFORMATS,CONTENTS,MEETTHEREQUIREMENTSOFSELECTEDFILES,POWERSOFATTORNEY,DECLARATIONSBYTHELEGALREPRESENTATIVEANDTHETENDERAGENTAPPLICATIONTOMEETTHEREQUIREMENTS2LICENCEANDABIDDINGAGENTQUALIFICATIONSMEETTHEREQUIREMENTS3THESIMILARPROJECTTENDERINGAGENCYAGENTNUMBERANDPROVIDEPROOFOFMATERIALCOMPLIANCE4THETENDERINGAGENCYINTENDSTOPUTINTOTHISPROJECTTHENUMBEROFPROFESSIONALSTOMEETTHEREQUIREMENTS5AREINTENDEDTOTHEAGENTOFTHEPROJECTASAPROJECTMANAGERHASSIMILARPROJECTSTHENUMBEROFANDREFERENCESTOMEETTHEREQUIREMENTS6NOFRAUDCASE82APPLICATIONREVIEWINDETAILTHEEVALUATIONCOMMITTEETHROUGHCOMPLIANCEREVIEWSWILLBESELECTEDFORDETAILEDREVIEWOFTHEAPPLICATION821TENDERAGENTINSTITUTIONSSIMILARPROJECTTENDERPERFORMANCEREQUIREMENTS16POINTSTENDERAGENTINSTITUTIONSSIMILARPROJECTTENDERPERFORMANCE16POINTS,BYTWOPARTCOMPOSITION1AGENTSIMILARPROJECTOFCUMULATIVEBIDAMOUNTSCOREDCALCULATIONRULESFORAGENTWATERPROJECTBIDAMOUNTONJANUARY1,2007HASHASBIDNOTICEFORASSOCIATECUMULATIVEEACHREACHED100MILLIONYUANHAVE2POINTS,WATERPROJECTCUMULATIVEBIDAMOUNTSCOREDUPNOTOVER6POINTSINADDITION,COMPLETESABIDWORTHMORETHAN500MILLIONYUANINTOTAL1MINUTE,BUTOTHERITEMSSCOREACCUMULATEDWINNINGAMOUNTUPTOAMAXIMUMOF6POINTS2CALCULATIONRULEFORTHENUMBEROFAGENTSSIMILARPROJECTSPROXYBIDAMOUNTSINCEJANUARY1,2007WINNINGNOTICESHALLPREVAILBIDDINGPROJECTSINMORETHAN50MILLIONYUANBY2POINTS,BUTTHEAGENCYPROJECTSTHENUMBEROFSCORESUPTO3MINUTES822TOBEAGENTSOFTHECONSTRUCTIONPROJECTASAPROJECTMANAGERINTHESAMEPROJECTPERFORMANCE10POINTSPROJECTMANAGERAGENTPERFORMANCESCORESINCLUDINGAGENTSOFTHEBIDDINGAGENCIESOFSIMILARPROJECTS,ASWELLASINOTHERSIMILARPROJECTTENDERINGAGENCYSERVICEAGENTDURINGPERFORMANCETOTAL10PROJECTMANAGERAGENTPERFORMANCE,MADEUPOFTWOPARTS1ACTINGLIKETHEACCUMULATEDWINNINGAMOUNTCALCULATIONRULEAGENTSFORWATERCONSERVANCYPROJECTBIDAMOUNTSINCEJANUARY1,2007WINNINGNOTICEFOREXAMPLECUMULATIVEAVERAGEREACHED100MILLIONYUAN3BUTSCOREDNOMORETHAN5MINUTES2CALCULATIONRULEFORTHENUMBEROFAGENTSSIMILARPROJECTSPROXYBIDAMOUNTSINCEJANUARY1,2007WINNINGNOTICEFOREXAMPLEINTHEMORETHAN50MILLIONYUANWATERCONSERVANCYPROJECTPERIODOF3MINUTES,BUTSCORESTHENUMBEROFAGENTSSIMILARPROJECTSUPTOAMAXIMUMOF5POINTSPROJECTMANAGERDEMONSTRATEDTOPROVINCIALLEVELANDHIGHERPEOPLESGOVERNMENTORTHEDEVELOPMENTANDREFORMCOMMISSIONPUBLISHEDTHEWINNINGBIDDERONTHEDESIGNATEDMEDIAPUBLICITYSHALLPREVAIL823STAFFREQUIREMENT25POINTS1,TOTHECONSTRUCTIONPROJECTSERVINGPERSONNEL,4YEARSEXPERIENCEINTENDERINGAGENT,2POINTSPERPERSON,2YEARSEXPERIENCEINTENDERINGAGENTPIGISNOTAPIGWITHDOMESTICINTERNATIONALMARKETANDTECHNOLOGYBIGENVIRONMENTOFCHANGES,ASCHINATRADITIONALINDUSTRYOFPIGPRODUCTIONOFJOBWAYANDPROFITWAYAREREQUIREMENTSRELATEDINDUSTRYFORRESOURCESINTEGRATION,TOQUALITYSECURITYFORPREMISE,REGULATIONBASEDFARMING,ANDMANAGEMENTCOSTANDTHEPRODUCTION,ANDSALESCOST,GOSTANDARDIZATION,ANDSCALE,ANDINTENSIVE,ANDMARKETROAD,FASTUPGRADEWHOLEINDUSTRYCHAINOFREGULATIONCAPACITY,MARKETCOMPETITIONCAPACITYANDANTIRISKCAPACITYFIRST,INDUSTRYANALYSISATHEBASICSITUATIONINCHINAISATRADITIONALHOGPRODUCTIONANDCONSUMPTIONCOUNTRY,20084615MILLIONTONSOFPORK,PIGSTOCK46264MILLIONHEADBYTHEENDPIGSLAUGHTER6096MILLIONNATIONALPIGINDUSTRYSANNUALPRODUCTIONVALUEATAROUND650BILLIONYUAN,NEARLY50PERCENTOFANNUALOUTPUTVALUEOFANIMALHUSBANDRYSICHUANPROVINCEIN2008PRODUCED652MILLIONTONSOFPORK,WITH694,000TONSOFCHENGDUCITY,LIVEPIGSELL1046MILLION,FIRST15VICEPROVINCIALCITIESINTHECOUNTRYTHEWHOLENATIONADVANTAGEREGIONALPLANNING20082015THEREARE437COUNTIESCITIES,55,SICHUAN,CHENGDUHAS7INCLUDINGINPENGZHOUINTERNATIONALPIGINDUSTRYMAINLYINCLUDETHEEUROPEANUNION,THEUNITEDSTATES,ANDCANADA,ANDBRAZILANDOTHERABSOLUTESCALEOFANIMALHUSBANDRYINDUSTRYANDTECHNOLOGYDEVELOPEDCOUNTRIESMARKET1,THEDOMESTICMARKETFROMCHINASMEATCONSUMPTIONHABITSANDECONOMICANALYSISOFTHEDEVELOPMENTSITUATION,THEEMERGENCEOFNEWTRENDSINTHEMARKETOFDOMESTICPORKANDITSPRODUCTSDOCKINGISAPIGPRODUCTIONANDSALESMORECLOSELYTHEYANGTZERIVERDELTA,PEARLRIVERDELTAANDTHEBOHAIRIMECONOMICDEVELOPEDAREAINDUSTRIALSTRUCTUREADJUSTMENTGATHEREDPACE,TWOORTHREEINDUSTRIESTOTHECENTRALANDWESTERNBIASSECOND,THERIGIDDOMESTICCONSUMPTIONGROWTHFORALONGPERIOD,PORKISSTILLTHELARGESTVARIETYOFMEATCONSUMPTIONINCHINA,THEABSOLUTECONSUMPTIONCONTINUESTOGROWESPECIALLYINTHEVASTRURALMARKETGROWTHPOTENTIALTHIRD,MARKETFORPORKANDHIGHERPRODUCTQUALITYREQUIREMENTSPOLLUTIONFREEPORKSAFETYANDHEALTHHASSHOWNAVERYGOODMARKETPROSPECTSFOURISTHEMARKETCHANGINGCURRENTLY,COLDMEAT,MOREANDMOREVARIETIESOFMEATANDPORKMEATPRODUCTS,WHICHACCOUNTEDFORALARGEPROPORTIONOFPORKCONSUMPTION,STORES,CHAINSTORES,SUPERMARKETSANDOTHERMARKETINGMETHODSISONTHERISE,ANDTRANSPORTHASBEENEXTENDEDTOMORETHAN2000KMINRADIUSCHENGDUISANIMPORTANT“RIVERPIG“RESOURCEMARKET,THECITYSCOMMERCIALRATEREACHESABOVE60OFLIVEPIGS,PORKANDRAWMATERIALSPRIMARYPROCESSINGPRODUCTSINTHEDOMESTICANDINTERNATIONALREPUTATIONISHIGHWESTERNHOGTRADINGCENT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下載積分: 6 賞幣
上傳時間:2024-03-12
頁數(shù): 20
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