JSP外文文献原稿和译文.docx
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JSP外文文献原稿和译文.docx
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外文文献原稿和译文
原 稿
JSP
JSP(JavaServerPages)isinitiatedbySunMicrosystems,Inc.,withmanycompaniestoparticipateintheestablishmentofadynamicwebpagetechnicalstandards.JSPtechnologysomewhatsimilartoASPtechnology,itisinthetraditionalHTMLwebpagedocument(*.htm,*.html)toinserttheJavaprogrammingparagraph(Scriptlet)andJSPtag(tag),thusJSPdocuments(*.jsp).
UsingJSPdevelopmentoftheWebapplicationiscross-platformthatcanrunonLinux,isalsoavailableforotheroperatingsystems.
JSPtechnologytousetheJavaprogramminglanguagepreparedbythecategoryofXMLtagsandscriptlets,toproducedynamicpagespackageprocessinglogic.Pagealsovisitby tagsandscriptletsexistintheservicessideoftheresourcesoflogic.JSPpagelogicandwebpagedesignanddisplayseparation,supportreusablecomponent-baseddesign,Web-basedapplicationdevelopmentisrapidandeasy.
WebserverinthefaceofvisitsJSPpagerequest,thefirstimplementationoftheproceduresof,andthentogetherwiththeresultsoftheimplementationofJSPdocumentsinHTMLcodewiththereturntothecustomer.InserttheJavaprogrammingoperationofthedatabasecanbere-orientedwebsites,inordertoachievetheestablishmentofdynamicpagesneededtofunction.
JSPandJavaServlet,isintheimplementationoftheserver,usually returnedtotheclientisanHTMLtext,aslongastheclientbrowserwillbeabletovisit.
JSPpagesfromHTMLcodeandJavacodeembeddedinoneofthecomponents.TheserverwasinthepagesofclientrequestsaftertheJavacodeandthenwillgeneratetheHTMLpagestoreturntotheclientbrowser.JavaServletJSPisthetechnicalfoundationandlarge-scaleWebapplicationdevelopmentneedsofJavaServletandJSPsupportto
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complete.JSPwiththeJavatechnologyeasytouse,fullyobject-oriented,andaplatform-independentandsecure,mainlyforallthecharacteristicsoftheInternet.
JavaScript,whichiscompletelydistinctfromtheJavaprogramminglanguage,isnormallyusedtodynamicallygenerateHTMLontheclient,buildingpartsoftheWebpageasthebrowserloadsthedocument.ThisisausefulcapabilityanddoesnotnormallyoverlapwiththecapabilitiesofJSP(whichrunsonlyontheserver).JSPpagesstillincludeSCRIPTtagsforJavaScript,justasnormalHTMLpagesdo.Infact,JSPcanevenbeusedtodynamicallygeneratetheJavaScriptthatwillbesenttotheclient.So,JavaScriptisnotacompetingtechnology;itisacomplementaryone.ItisalsopossibletouseJavaScriptontheserver,mostnotablyonSunONE(formerlyiPlanet),IIS,andBroadVisionservers.However,Javaismorepowerful,flexible,reliable,andportable.
JSP(arecursiveacronymfor"JSP:
HypertextPreprocessor")isafree,open-source,HTML-embeddedscriptinglanguagethatissomewhatsimilartobothASPandJSP.OneadvantageofJSPisthatthedynamicpartiswritteninJava,whichalreadyhasanextensiveAPIfornetworking,databaseaccess,distributedobjects,andthelike,whereasPHPrequireslearninganentirelynew,lesswidelyusedlanguage. AsecondadvantageisthatJSPismuchmorewidelysupportedbytoolandservervendorsthanisJSP.VersusPureServlets.
JSPdoesn'tprovideanycapabilitiesthatcouldn't,inprinciple,beaccomplishedwithservlets.Infact,JSPdocumentsareautomaticallytranslatedintoservletsbehindthescenes.Butitismoreconvenienttowrite(andtomodify!
)regularHTMLthantouseazillionprintlnstatementstogeneratetheHTML.Plus,byseparatingthepresentationfromthecontent,youcanputdifferentpeopleondifferenttasks:
yourWebpagedesignexpertscanbuildtheHTMLbyusingfamiliartoolsandeitherleaveplacesforyourservletprogrammerstoinsertthedynamiccontentorinvokethedynamiccontentindirectlybymeansofXMLtags.
JSPtechnologystrength
(1)timetoprepare,runeverywhere.AtthispointJavabetterthanPHP,inadditiontosystems,thecodenottomakeanychanges.
(2)themulti-platformsupport.Basicallyonallplatformsofanydevelopmentenvironment,inanyenvironmentfordeploymentinanyenvironmentintheexpansion.ComparedASP/PHPlimitationsareobvious.
(3)astrongscalability.FromonlyasmallJardocumentscanrunServletJSP,tothemultipleserversclusteringandloadbalancing,tomultipleApplicationfortransactionprocessing,informationprocessing,aservertonumerousservers,JavashowsatremendousVitality.
(4)diversificationandpowerfuldevelopmenttoolssupport.ThisissimilartotheASP,Javaalreadyhavemanyverygooddevelopmenttools,andmanycanbefree,andmanyofthemhavebeenabletorunonavarietyofplatformsunder.
JSPtechnologyvulnerable:
(1)andthesameASP,Javaistheadvantageofsomeofitsfatalproblem.Itispreciselybecauseinordertocross-platformfunctionality,
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