外文文献及中文翻译.docx

外文文献及中文翻译.docx

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外文文献及中文翻译

毕业设计说明书

英文文献及中文翻译

软件学院

学生姓名：

学号：

软件工程

学院：

唐利忠李华玲

专业：

指导教师：

2014年6月

JSPTechnologyConspectusAndSpecialties

TheJSP（JavaServermix）technologyisusedbytheSunmicrosystemissuedbythecompanytodevelopdynamicWebapplicationtechnology.Withitseasy,cross-platform,inmanydynamicWebapplicationprogramminglanguages,inashortspanofafewyears,hasformedacompletesetofstandards,andwidelyusedinelectroniccommerce,etc.InChina,theJSPnowalsogotmoreextensiveattention,getagooddevelopment,moreandmoredynamicwebsitetoJSPtechnology.TherelatedtechnologiesofJSParebrieflyintroduced.

TheJSPasimpletechnologycanquicklyandwiththemethodofgeneratingWebpages.UsetheJSPtechnologyWebpagecanbeeasilydisplaydynamiccontent.TheJSPtechnologyaredesignedtomaketheconstructionbasedonWebapplicationseasierandefficient,andtheseapplicationsandvariousWebserver,applicationserver,thebrowseranddevelopmenttoolsworktogether.

TheJSPtechnologyisn'ttheonlydynamicwebtechnology,alsonotthefirstone,intheJSPtechnologyexistedbeforetheemergenceofseveralexcellentdynamicwebtechnology,suchasCGI,ASP,etc.Withtheintroductionofthesetechnologiesunderdynamicwebtechnology,thedevelopmentandtheJSP.Technical

1JSPthedevelopmentbackgroundanddevelopmenthistory

Inwebbriefhistory,fromaworldwidewebthatmostofthenetworkinformationstaticonstocktransactionsevolutiontoacquisitionofanoperationandinfrastructure.Inavarietyofapplications,maybeusedforbasedonWebclient,looknorestrictions.

Basedonthebrowserclientapplicationsthantraditionalbasedonclient/serverapplicationshasseveraladvantages.Thesebenefitsincludealmostnolimitclientaccessandextremelysimplifiedapplicationdeploymentandmanagement（toupdateanapplication,managementpersonnelonlyneedtochangetheprogramonaserver,notthousandsofinstallationinclientapplications）.So,thesoftwareindustryisrapidlytobuildontheclientbrowsermulti-layerapplication.

TherapidgrowthofexquisitebasedWebapplicationrequirementsdevelopmentoftechnicalimprovements.StaticHTMLtoshowrelativelystaticcontentisrightchoice,ThenewchallengeistocreatetheinteractionbasedonWebapplications,intheseprocedures,thecontentofaWebpageisbasedontheuser'srequestorthestateofthesystem,andarenotpredefinedcharacters.

FortheproblemofanearlysolutionistouseaCGI-BINinterface.DeveloperswritetointerfacewiththerelevantproceduresandseparatebasedonWebapplications,thelatterthroughtheWebservertoinvoketheformer.Thisplanhasseriousproblem--eachnewextensibleCGIrequirementsinanewprocessontheserver.Ifmultipleconcurrentusersaccesstothisprocedure,theseprocesseswillusetheWebserverofallavailableresources,andtheperformanceofthesystemwillbereducedtoextremelylow.

SomeWebserverprovidershavetoprovidefortheirserverbyplugins"and"theAPItosimplifytheWebapplicationdevelopment.ThesesolutionsareassociatedwithcertainWebserver,cannotsolvethespanmultiplesupplierssolutions.Forexample,Microsoft'sActiveServermix（ASP）technologyintheWebpagetocreatedynamiccontentmoreeasily,butalsocanworkinMicrosoftonPersonalWebServerandIIS.

Thereareothersolutions,butcannotmakeanordinarypagedesignerscaneasilymaster.Forexample,suchastheServletJavatechnologiescanuseJavalanguageinteractionapplicationservercodeeasier.DeveloperstowritesuchServlettoreceivesignalsfromtheWebbrowsertogenerateanHTTPrequest,adynamicresponse（maybeinquiresthedatabasetofinishtherequest）,thensendcontainHTMLorXMLdocumentstotheresponseofthebrowser.

note:

oneisbasedonaJavaServletJavatechnicaloperationintheserverprogram（withdifferent,thelatteroperatingintheAppletbrowserend）.InthisbooktheServletchapter4.

Usingthismethod,theentirepagemusthavemadeinJavaServlet.IfdevelopersorWebmanagerswanttoadjustpage,you'llhavetoeditandrecompiletheServletJava,eveninlogichasbeenabletorun.Usingthismethod,thedynamiccontentwiththeapplicationofthepagestillneedtodevelopskills.

Obviously,whatisneededisaindustrytocreatedynamiccontentwithinthescopeofthepagesofthesolution.Thisprogramwillsolvethecurrentschemearelimited.Asfollows:

canonanyWebserverorapplications.

willapplicationpagedisplaysandseparation.

canrapidlydevelopingandtesting.

simplifytheinteractivedevelopmentbasedonWebapplicationprocess.

TheJSPtechnologyisdesignedtomeetsuchrequirements.TheJSPspecificationisaWebserver,applicationserver,tradingsystemanddevelopextensivecooperationbetweenthetoolsuppliers.FromthisstandardtodeveloptheexistingintegrationandbalanceofJavaprogrammingenvironment（forexample,JavaServletandJavaBeans）supporttechniquesandtools.TheresultisakindofnewanddevelopingmethodbasedonWebapplications,usingcomponent-basedapplicationlogicpagedesignerswithpowerfulfunctions.

2OverallSemanticsofaJSPPage

AJSPpageimplementationclassdefinesa_jspService（）methodmappingfromtherequesttotheresponseobject.Somedetailsofthistransformationarespecifictothescriptinglanguageused（seeChapterJSP.9,“Scripting”）.Mostdetailsarenotlanguagespecificandaredescribedinthischapter.

ThecontentofaJSPpageisdevotedlargelytodescribingthedatathatiswrittenintotheoutputstreamoftheresponse.（TheJSPcontainerusuallysendsthisdatabacktotheclient.）ThedescriptionisbasedonaJspWriterobjectthatisexposedthroughtheimplicitobjectout（seeSectionJSP.1.8.3,“ImplicitObjects”）.Itsvaluevaries:

Initially,outisanewJspWriterobject.Thisobjectmaybedifferentfromthestreamobjectreturnedfromresponse.getWriter（）,andmaybeconsideredtobeinterposedonthelatterinordertoimplementbuffering（seeSectionJSP.1.10.1,“ThepageDirective”）.Thisistheinitialoutobject.JSPpageauthorsareprohibitedfromwritingdirectlytoeitherthePrintWriterorOutputStreamassociatedwiththeServletResponse.

TheJSPcontainershouldnotinvokeresponse.getWriter（）untilthetimewhenthefirstportionofthecontentistobesenttotheclient.ThisenablesanumberofusesofJSP,includingusingJSPasalanguageto“glue”actionsthatdeliverbinarycontent,orreliablyforwardingtoaservlet,orchangedynamicallythecontenttypeoftheresponsebeforegeneratingcontent.SeeChapterJSP.4,“InternationalizationIssues”.

Withinthebodyofsomeactions,outmaybetemporarilyre-assignedtoadifferent（nested）instanceofaJspWriterobject.Whetherthisisthecasedependsonthedetailsoftheaction’ssemantics.Typicallythecontentofthesetemporarystreamsisappendedtothestreampreviouslyreferredtobyout,andoutissubsequentlyre-assignedtorefertotheprevious（nesting）stream.Suchnestedstreamsarealwaysbuffered,andrequireexplicitflushingtoanestingstreamortheircontentswillbediscarded.

IftheinitialoutJspWriterobjectisbuffered,thendependinguponthevalueoftheautoFlushattributeofthepagedirective,thecontentofthatbufferwilleitherbeautomaticallyflushedouttotheServletResponseoutputstreamtoobviateoverflow,oranexceptionshallbethrowntosignalbufferoverflow.IftheinitialoutJspWriterisunbuffered,thencontentwrittentoitwillbepasseddirectlythroughtotheServletResponseoutputstream.

AJSPpagecanalsodescribewhatshouldhappenwhensomespecificeventsoccur.InJSP2.1,theonlyeventsthatcanbedescribedaretheinitializationandthedestructionofthepage.Theseeventsaredescribedusing“well-knownmethodnames”indeclarationelements..

JavaScriptisusedforthefirstkindisbrowser,thedynamicgeneralpurposeofclientscriptinglanguage.Netscapefirstproposedin1995,butitsJavaScriptLiveScriptcalled.ThenquicklyNetscapeLiveScriptrenamedJavaScript,Javadeveloperswiththemfromthesameissuedastatement.AstatementJavaandJavaScriptwillcomplementeachother,buttheyaredifferent,sothetechnologyofthemanydismissedthemisunderstandingofthetwotechnologies.

JavaScripttocreateuserinterfacecontrolprovidesascriptinglanguage.Infact,inthebrowserintotheJavaScriptcodelogic.Itcansupportsucheffect:

whenthecursorontheWebpageofamobileuserinputvalidationortransformimage.

MicrosoftalsowriteouttheirJavaScriptversionandtheJScriptcalled.MicrosoftandNetscapesupportJavaScriptandJScriptaroundacorecharacteristicsandEuropeanManufacturersis.mdby（ECMA）standardsorganization,thecontrolstandardofscriptinglanguage.ECMAitsscriptinglanguageECMAScriptnamed.

ServletsandJSPsoftenincludefragmentsofinformationthatarecommontoanorganization,suchaslogos,copyrights,trademarks,ornavigationbars.Thewebapplicationusestheincludemechanismstoimporttheinformationwhereveritisneeded,sinceitiseasiertochangecontentinoneplacethentomaintainitineverypieceofcodewhereitisused.Someofthisinformationisstaticandeitherneverorrarelychanges,suchasanorganization'slogo.Inothercases,theinformationismoredynamicandchangesoftenandunpredictably,suchasatextualgreetingthatmustbelocalizedforeachuser.Inbothcases,youwanttoensurethattheservletorJSPcanevolveindependentlyofitsincludedcontent,andthattheimplementationoftheservletorJSPproperlyupdatesitsincludedcontentasnecessary.

Youwanttoincludearesour