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外文翻译---什么是ASP文件.doc

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外文翻译---什么是ASP文件.doc

WhatisanASPFileWithASPfiles,youcanactivateyourWebsiteusinganycombinationofHTML,scriptingsuchasJavaScriptorVisualBasic®ScriptingEditionVBScriptandcomponentswritteninanylanguage.ThismeansyourASPfileissimplyafilethatcancontainanycombinationofHTML,scripting,andcallstocomponents.WhenyoumakeachangeontheASPfileontheserver,youneedonlysavethechangestothefilethenexttimetheWebpageisloaded,thescriptwillautomaticallybecompiled.HowdoesthishappenItworksbecauseASPtechnologyisbuiltdirectlyintoMicrosoftWebservers,andisthussupportedonallMicrosoftWebserversWindowsNTInternetInformationServerIIS3.0,WindowsNTWorkstation,andWindows95PersonalWebServer.TheobjectmodelofASP,MicrosoftstyleHereshowitworks.WhenabrowserrequestsanASPfilefromyourWebserver,yourWebservercallsActiveServerPagestoreadthroughtheASPfile,executinganyofthecommandscontainedwithinandsendingtheresultingHTMLpagetothebrowser.AnASPfilecancontainanycombinationofHTML,script,orcommands.Thescriptcanassignvaluestovariables,requestinformationfromtheserver,orcombineanysetofcommandsintoprocedures.ASPusesthedelimitersbetterknowntoyouandmeasthingamabobsthatspecifythebeginningandendtoenclosescriptcommands.Forexample,thecodebelowsetsthevalueofthevariableMyFavTVShowintheusercookiestoIDreamofJeannie.ThescriptinglanguagessupportedbyASPinturnsupportuseoftheIfThenElseconstructsomethingthatwillundoubtedlywarmtheheartsofallcodersoutthere.Finally,youcanembedsomereallogicintoyourHTML.Forexample,thefollowingcodefromtheIISdocumentationshowshowyoucansetthegreetingshownbaseduponthetimeofday.120000AMAndTimeGoodMorningHelloImsurethatyoucanthinkofsomethingmoreinterestingforyourWebsiteIdhatetohavetocomeupwithallofthecleverideas.BuiltinObjectsASPincludesfivestandardobjectsforglobaluseRequesttogetinformationfromtheuserResponsetosendinformationtotheuserServertocontroltheInternetInformationServerSessiontostoreinformationaboutandchangesettingsfortheuserscurrentWebserversessionApplicationtoshareapplicationlevelinformationandcontrolsettingsforthelifetimeoftheapplicationTheRequestandResponseobjectscontaincollectionsbitsofinformationthatareaccessedinthesameway.Objectsusemethodstodosometypeofprocedureifyouknowanyobjectorientedprogramminglanguage,youknowalreadywhatamethodisandpropertiestostoreanyoftheobjectsattributessuchascolor,font,orsize.TheRequestobjectTheRequestobjectisusedtogetinformationfromtheuserthatispassedalonginanHTTPrequest.AsImentionedearlier,theRequestandResponseobjectssupportcollectionsClientCertificatetogetthecertificationfieldsfromtherequestissuedbytheWebbrowser.ThefieldsthatyoucanrequestarespecifiedintheX.509standardQueryStringtogettextsuchasaname,suchasmyfavoriteTVsitcomaboveFormtogetdatafromanHTMLformCookiestogetthevalueofapplicationdefinedcookieServerVariablestogetHTTPinformationsuchastheservernameTheResponseobjectTheResponseobjectisusedtosendinformationtotheuser.TheResponseobjectsupportsonlyCookiesasacollectiontosetcookievalues.TheResponseobjectalsosupportsanumberofpropertiesandmethods.PropertiescurrentlysupportedareBuffersettobufferpageoutputattheserver.Whenthisissettotrue,theserverwillnotsendaresponseuntilalloftheserverscriptsonthecurrentpagehavebeenprocessed,oruntiltheFlushorEndmethodhasbeencalled.ContentTypetosetthetypeofcontenti.etext/HTML,Excel,etc.ExpiressetstheexpirationwhenthedataintheuserscacheforthisWebpageisconsideredinvalidbasedonminutesi.e.expiresin10minutes.ExpiresAbsoluteallowsyoutosettheexpirationdatetoanabsolutedateandtime.StatusreturnsthestatuslinedefinedintheHTTPspecificationfortheserver.ThefollowingmethodsaresupportedbytheResponseobjectAddHeaderAddsanHTMLheaderwithaspecifiedvalueAppendToLogAppendsastringtotheendoftheWebserverlogfileBinaryWritewritesbinarydatai.e,ExcelspreadsheetdataClearclearsanybufferedHTMLoutput.Endstopsprocessingofthescript.Flushsendsalloftheinformationinthebuffer.RedirecttoredirecttheusertoadifferentURLWritetowriteintotheHTMLstream.ThiscanbedonebyusingtheconstructResponse.writehelloortheshortcutcommandTheServerobjectTheServerobjectsupportsoneproperty,ScriptTimeout,whichallowsyoutosetthevalueforwhenthescriptprocessingwilltimeout,andthefollowingmethodsCreateObjecttocreateaninstanceofaservercomponent.ThiscomponentcanbeanycomponentthatyouhaveinstalledonyourserversuchasanActiveX.HTMLEncodetoencodethespecifiedstringinHTML.MapPathtomapthecurrentvirtualpathtoaphysicaldirectorystructure.Youcanthenpassthatpathtoacomponentthatcreatesthespecifieddirectoryorfileontheserver.URLEncodeappliesURLencodingtoaspecifiedstring.TheSessionobjectTheSessionobjectisusedtostoreinformationaboutthecurrentusersWebserversession.Variablesstoredwiththisobjectexistaslongastheuserssessionisactive,evenifmorethanoneapplicationisused.Thisobjectsupportsonemethod,Abandon,whichbelieveitornotabandonsthecurrentWebserversession,destroyinganyobjects,andsupportstwoproperties,SessionID,containingtheidentifierforthecurrentsession,andTimeout,specifyingatimeoutvalueforthesession.OnethingtobearinmindaboutthesessionidentifierItsnotaGUID.ItsonlygoodaslongasthecurrentWebserversessionisrunning.IfyoushutdowntheWebserverservice,theidentifierswillstartalloveragain.SodontuseittocreatelogonIDs,oryoullhaveabunchofduplicatesandoneheckofaheadache.TheApplicationobjectTheApplicationobjectcanstoreinformationthatpersistsfortheentirelifetimeofanapplicationagroupofpageswithacommonroot.Generally,thisisthewholetimethattheIISserverisrunning.Thismakesitagreatplacetostoreinformationthathastoexistformorethanoneusersuchasapagecounter.Thedownsideofthisisthatsincethisobjectisntcreatedanewforeachuser,errorsthatmaynotshowupwhenthecodeiscalledoncemayshowupwhenitiscalled10,000timesinarow.Inaddition,becausetheApplicationobjectissharedbyalltheusers,threadingcanbeanightmaretoimplement.

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