有关进销存管理系统中英文翻译

共17页第17-页Intraditionalsupplychaininventorymanagement,ordersaretheonlyinformationfirmsexchange,butinformationtechnologynowallowsfirmstosharedemandandinventorydataquicklyandinexpensively.Westudythevalueofsharingthesedatainamodelwithonesupplier,Nidenticalretailers,andstationarystochasticconsumerdemand.Thereareinventoryholdingcostsandback-orderpenaltycosts.Wecompareatraditionalinformationpolicythatdoesnotusesharedinformationwithafullinformationpolicythatdoesexploitsharedinformation.Inanumericalstudywefindthatsupplychaincostsare2.2%loweronaveragewiththefullinformationpolicythanwiththetraditionalinformationpolicy,andthemaximumdifferenceis12.1%.Wealsodevelopasimulation-basedlowerboundoverallfeasiblepolicies.Thecostdifferencebetweenthetraditionalinformationpolicyandthelowerboundisanupperboundonthevalueofinformationsharing:Inthesamestudy,thatdifferenceis3.4%onaverage,andnomorethan13.8%.Wecontrastthevalueofinformationsharingwithtwootherbenefitsofinformationtechnology,fasterandcheaperorderprocessing,whichleadtoshorterleadtimesandsmallerbatchsizes,respectively.Inoursample,cuttingleadtimesnearlyinhalfreducescostsby21%onaverage,andcuttingbatchesinhalfreducescostsby22%onaverage.Forthesettingswestudy,weconcludethatimplementinginformationtechnologytoaccelerateandsmooththephysicalflowofgoodsthroughasupplychainissignificantlymorevaluablethanusinginformationtechnologytoexpandtheflowofinformation.Inventorymanagementisacommercialenterprisemanagementofthecoreareas,Enterprisescanalsoachieveaneffectivekey,ifwecanachievefromthepurchaseofstock,Salesthentheentireflowofgoodsandcapitalflowsituationfortheunifiedmanagementandreasonableproduction,timelysalesandinventoryisthesmallest.reducethebacklogofmaterial,thenthebusinesswillachievethebestresults.1.sessionInmyexperience,sessionwordisprobablysecondonlytotheextentoftheabuseoftransaction,evenmoreinterestingisthetransactionandthesessioninthecontextofthemeaningofsomeofthesame.

session,theChineseoftentranslatedintothesession,itsoriginalmeaningreferstothebeginningsandendsofaseriesofaction/information,suchasaphonecallfromthedialtopickupthephonetohangupthemiddleoftheprocesscanbedescribedasaseriesofsession.Sometimeswecanseethatthecase"duringthesessioninabrowsersession,...",termusedhereisitsoriginalmeaning,isopenfromabrowserwindowtoclosetheperiodof①.Themostconfusingisthe"user(client)duringthefirstsession,"thewords,itmayrefertoaseriesofuseractions(generallywithaspecificpurposerelatedtoaseriesofactions,suchaslogontobuygoodsfromtosignoutsuchanonlineshoppingcheckoutprocess,sometimesalsocalledatransaction),butsometimesmaybejustthataconnectioncouldalsobethatthemeaningof①,thedifferencecanonlybeinferredbycontext②.

However,whenthetermsessionisassociatedwiththenetworkprotocolwhenitoftenimpliesa"connection-oriented"and/or"onhold"sothetwomeanings,"connection-oriented"referstoboththecommunicationinthecommunicationpriortofirstestablishacommunicationchannel,suchasphonecalls,untiltheotherpartyansweredthephonecommunicationcanbegin,andthisistheoppositeofwriting,beforeyousenttheletter,thetimeyouandcannotconfirmtheothersideoftheaddressiscorrect,communicationchannelsBuyiDingcanbeestablished,butthesender,thecommunicationhasalreadybegun."Keepstate"meansthecommunicationpartyisabletoassociateaseriesofmessages,makingmessagesbetweeneachotherdepends,forexample,awaitercanrecognizeoldcustomerscomebackandrememberthelasttimethecustomerstillowesastore,dollar.Examplesofthistype,"aTCPsession"or"aPOP3session"③.

Andtothewebserverflourishing,sessioninthecontextofsemanticwebdevelopmenthasanewexpansion,itsmeaningismeantotheclientandservertomaintainstatebetweenthesolution④.Sessionisalsosometimesusedtorefertosuchsolutions,storagestructures,such"storedinthesessiontoxxxwhere"⑤.Forvarious用于webdevelopmentlanguagesareavailabletosomeextentonthesupportofsuchasolution,sointhecontextofaparticularlanguage下,sessionalsousedtodenoteasolutiononbehalfofthelanguage,suchasregularJavaintheprovisionofjavax.servlet.http.HttpSessionreferredtoasthesession⑥.

Inviewofthisconfusionhasbeenchanged,inthisarticleusethetermsessionwillhavedifferentmeaningsdependingonthecontext,drewattentiontotheresolution.

Inthisarticle,theuseofChinese"duringthebrowsersession,"toconveythemeaningof①,use"sessionmechanism"toconveythemeaning④,usethe"session"expressionmeaning⑤,usespecific"HttpSession"toconveythemeaning⑥Second,HTTPprotocolandthestatetomaintain

HTTPprotocolitselfisstateless,HTTPprotocolwhichisconsistentwiththeoriginalpurposeoftheclientonlyneedsasimplerequesttodownloadsomefileserver,eithertheclientortheservernothavebeennecessaryrecordsofpastbehaviortoeachother,andeachtimebetweentherequestareindependent,likeacustomerandavendingmachineoranordinary(non-membership)astherelationshipbetweensupermarkets.

However,smart(orgreedy?)Peoplesoondiscoveredthatiftheycanprovideon-demandgenerationofdynamicwebinformationwillbecomemoreuseful,likeacableTVwithon-demandthesamefunction.ThisdemandontheonehandtoforcegraduallyaddHTMLform,script,DOMandotherclient-sidebehavior,ontheotherhandthereistheserver-sideCGIpracticestorespondtoclient-sidedynamicrequest,theHTTPprotocolasthetransportcarrieralsoaddedafileupload,cookiethesecharacteristics.TherolewhichcookieistosolvethestatelessHTTPprotocoleffortsdefects.Asforthesubsequentemergenceofthesessionmechanismisyetanotherinbetweentheclientandtheserverstatesolution.

Letususesomeexamplestodescribethesessioncookieandthedifferencesandsimilaritiesbetweenthemechanisms.Ioncefrequentedacoffeeshopwithfreegiftstodrinkfivecupsofcoffeeoffersacupofcoffee,butaone-timeconsumptionoffivecupsofcoffeeisremote,thenneedawaytorecordacustomer'sconsumption.Imaginethatinfactnothinglessthanthefollowingseveraloptions:

1,thestore'sstaffisverypowerful,abletoremembereachcustomer'sconsumption,aslongascustomersenteredthecafe,shopassistantsknowhowtodealwiththe.Thisapproachistheagreementitselftosupportthestate.

2,issuecustomersacardrecordingthenumberofconsumersingeneralhaveavalidityperiod.Eachconsumer,ifthiscardisproduced,thentheconsumerwillbewiththeconsumerbeforeorafterlinkingup.Thisapproachismaintainedintheclientstate.

3,amembershipcardissuedtocustomers,inadditiontoanyinformationoutsidethecardnumberisnotrecorded,eachconsumer,ifthecardisproduced,thentherecordsclerkinthestoretofindthecardnumbercorrespondstotherecordtoaddsomeconsumerinformation.Thisapproachismaintainedintheserver-sidestate.

AstheHTTPprotocolisstateless,butduetovariousconsiderationsdonotwanttobecomeastate,therefore,thelasttwoprogramshasbecomearealisticoption.Specificallycookiemechanismisusedtomaintainstateoftheclientprogram,whichusesasessionmechanismtomaintainstateintheserver-sideprogram.Wealsoseethat,thankstoserver-sidemaintainstateoftheprogramincustomerclientbutalsoXuyaobaocunalogo,somechanismsmayneedthehelpofsessioncookiemechanismtoidentifythepurposeofDaDaosaved,itactuallyalternativesareavailable.Third,thecookiemechanism

Thebasicprinciplecookiemechanismassimpleastheaboveexample,butthereareseveralissuestoresolve:"membershipcard"howtodistribute;"membershipcard"ofthecontent;andcustomershowtousethe"MemberCard."

OrthodoxcookiedistributionisbyextendingtheHTTPprotocoltoachieve,andtheserverthroughtheHTTPresponseheaderwithalineofspecialinstructionstopromptthebrowserinaccordancewiththeinstructionsgeneratesthecorrespondingcookie.Butpureclient-sidescriptingsuchasJavaScriptorVBScriptcanalsogeneratethecookie.

Thecookieusedbythebrowserinthebackgroundaccordingtocertainprinciplesautomaticallysenttotheserver.Checkallstoredbrowsercookie,ifacookieisgreaterthanorequalscopestatementwillbethelocationoftherequestedresources,puttheresourcesoftheHTTPrequestcookieattachedtotheheadsenttherequesttotheserver.MeansthatMcDonald'smembershipcardcanonlybeproducedintheMcDonald'sstore,ifastorehasalsoissueditsownmembershipcard,thenenterthestorewhentheadditiontoproduceMcDonald'smembershipcard,butalsotoproduceamemberofthestorecard.

cookie'scontentsinclude:name,values,expirationtime,pathanddomain.

Youcanspecifyadomaininwhichadomainsuchas.G,theequivalentofmainstoresigns,suchasProcter&Gamble,youcanalsospecifyaspecificdomainofamachineundersuchor,canfloatFlexibilitytodothan.

PathisthenamebehindtheURLwiththepath,suchas/or/foo,etc.,candomorethanacounterRejoice.

Pathtogetherwiththedomainconstitutesacookie'sscope.

Ifyoudonotsettheexpirationtime,thenthelifetimeofthiscookietothebrowserduringthesession,simplyclosethebrowserwindow,cookiedisappears.Thisperiodoflifeofthecookiebrowsersessioniscalledsessioncookie.Sessioncookieisgenerallynotstoredontheharddiskbutkeptinmemory,ofcourse,providedthatitisnotstandardized.Ifyousettheexpirationtime,thebrowserthecookiewillbesavedtotheharddisk,openagainafterclosingthebrowser,thecookieisstillvaliduntiltheexpirationtimeexceedsaset.

Storedinacookieonyourharddiskinadifferentbrowser,sharedbetweenprocesses,suchasthetwoIEwindows.Andstoredinmemoryforthecookie,differentbrowsershavedifferentapproaches.ForIE,openwindowsinapressCtrl-N(orfromtheFilemenu)toopenthewindowcanbesharedwiththeoriginalwindowwhileusingothermeanstoopentheIEprocesswillnothavetoopenthewindowssharedmemorycookie;forMozillaFirefox0.8,alloftheprocessandcansharethesametabthecookie.Ingeneralisthewindow.openjavascriptwindowwillopenwiththeoriginalwindowssharedmemorycookie.Browser,thiscookieforthesessioncookiedoesnotbelievethatpeopleonlyrecognizetheapproachtotheuseoftheregularsessionofwebapplicationdevelopmentmechanismcausinggreatdistress.

Hereisagoolgesetcookieresponseheaderexample

HTTP/1.1302Found

Location:/intl/zh-CN/

Set-Cookie:PREF=ID=0565f77e132de138:NW=1:TM=1098082649:LM=1098082649:S=KaeaCFPo49RiA_d8;expires=Sun,17-Jan-203819:14:07GMT;path=/;domain=.

Content-Type:text/html

ThisistheuseofHTTPLooktheHTTPSnifferHTTPcommunicationssoftwaretocapturethepartoftherecord

Goolgebrowsertoaccesstheresourcesagain,automaticallysendoutcookie

UseFirefoxcaneasilyobservethecurrentvalueofcookie

UseHTTPLookwithFirefoxcookiecaneasilyunderstandtheworkingprinciple.

IEcanbesettoaskbeforeacceptingcookie

Thisisadialogboxaskingtoacceptcookie.

Fourth,understandthesessionmechanism

mechanismisaserver-sidesessionmechanism,theserverusesahashtableissimilartothestructure(andprobablyistouseahashtable)tosavetheinformation.

Whentheprogramneedsforaclient'srequesttocreateasessionwhentheserverfirstcheckstheclient'srequestisincludedinasessionID-knownasthesessionid,ifthedescriptioncontainsasessionidforthisclientpreviouslyCreateoversession,theserverinaccordancewiththesessionidtoretrievethesessionoutoftheuse(ifnotretrieved,maybethenewone),iftheclientrequestdoesnotincludesessionid,thencreateasessionforthisclientandgenerateasessionwiththisassociatedwiththesessionid,sessionidvalueshouldbeanotonlywillnotrepeat,noteasytofindthelawtocopythestring,thesessionidtobereturnedinthisresponsetotheclientsaved.

Savethesessionidofthewaystousecookie,sotheinteractionofthebrowsercanautomaticallyidentifythisplaybytherulestotheserver.ThenameofthiscookiearegenerallysimilartoSEEESIONID,and.Forexample,webapplicationsweblogicgeneratedcookie,JSESSIONID=ByOK3vjFD75aPnrF7C2HmdnV6QZcEbzWoWiBYEnLerjQ99zWpBng!-145788764,ItsnameisJSESSIONID.

Asthecookiecanbeartificiallyprohibited,theremustbeothermechanismstobebannedinthecookiewhenthesessionidstillbeabletopassbacktotheserver.OftenuseatechniquecalledURLrewriting,thesessionidisattachedtotheURLpathdirectlybehind,therearetwoadditionalways,oneistheURLpathasadditionalinformation,showingtheformofhttp://...../xxx;jsessionid=ByOK3vjFD75aPnrF7C2HmdnV6QZcEbzWoWiBYEnLerjQ99zWpBng!-145788764

TheotherisasaURLquerystringappendedtotheback,showingtheformofhttp:///xxx?jsessionid=ByOK3vjFD75aPnrF7C2HmdnV6QZcEbzWoWiBYEnLerjQ99zWpBng!-145788764

Bothwaysisnodifferentforusers,andonlyaserverparsingthetimetodealwiththedifferentways,usingthefirstwaysareconducivetoturningonekindofsessionid'sinformationandtodistinguishnormalprogramparameters.

WeiLiaoZaitheinteractionalwaysmaintainstate,wemusteachclientmayrequestapathtotherearofcontainingthissessionid.

Anothertechniqueknownashiddenformfields.Isthattheserverwillautomaticallymodifytheform,addahiddenfield,sowhentheformissubmittedtothesessionidpassedbacktotheserver.Example,thefollowingform

<formname="testform"action="/xxx">

<inputtype="text">

</Form>

Beingpassedtoclientwillberewrittenbefore

<formname="testform"action="/xxx">

<inputtype="hidden"name="jsessionid"value="ByOK3vjFD75aPnrF7C2HmdnV6QZcEbzWoWiBYEnLerjQ99zWpBng!-145788764">

<inputtype="text">

</Form>

Applicationofthistechnologyisnowless,IcontactedtheveryoldiPlanet6(SunONEApplicationServer'spredecessor)ontheuseofthistechnology.

InfactthistechnologycansimplyapplytotheactionURLrewritinginstead.

Whentalkingaboutthesessionmechanism,oftenheardofsuchamisunderstanding,"aslongasthebrowserisclosed,sessiondisappears."Infact,imaginetheexamplecard,unlessthecustomertomakesalesonthestorecard,otherwisethestorewouldnoteasilyremovethecustomerinformation.Thisisalsotrueofthesession,unlesstheproceduretoinformtheservertodeleteasession,otherwisetheserverwillremainontheprogramaregenerallydoneintheuserlogoffwhenthesendacommandtodeletethesession.However,thebrowserwillnevertaketheinitiativetonotifytheserverwillbeshutoff,sotheserverwillnothavetheopportunitytoknowthebrowserhasbeenthereasonwhythereissuchamisconception,themajorityofsessionmechanismtouseasessioncookietostorethesessionidandcloseyourbrowserthesessionidisgone,onceagainconnecttotheserverwillnotbeabletofindwhentheoriginalsession.Iftheservercookiesettingsaresavedtotheharddisk,orusesomemeanstorewritethebrowser'sHTTPrequestheadersenttotheoriginalsessionidsenttotheserver,thenre-openthebrowsercanstillfindtheoriginalsession.

Itispreciselybecauseoftheclosuredoesnotcausethebrowsersessionisdeleted,forcingserverseesionsetupafailuretime,asthedistancebetweenthefirstuseoftheclientsessionformorethanthefailuretime,theserverthattheclienthasceaseditsactivities,thesessionwillbedeletedtosavestoragespace.

5,javax.servlet.http.HttpSession

HttpSessionsessionmechanismistheJavaplatformimplementationofnorms,becauseitisonlytheinterface,specifictoeachwebapplicationserverproviders,inadditiontostandardsupport,therewillstillbenorequirementofsomenormsinthenuances.HerewearewithBEA'sWeblogicServer8.1asanexampletodemonstrate.

Firstofall,WeblogicServerprovidesasetofparameterstocontrolitsHttpSessionimplementation,includingtheuseofcookieswitchoptiontouseURLrewritingswitches,sessionpersistencesettings,sessionfailuretimesetting,aswellasforthecookieavarietyofsettings,suchassetcookiename,path,domain,cookiesurvivaltime.

Ingeneral,sessionarestoredinmemory,whentheprocessisstopped,orrestarttheserverwhenthememoryofthesessionwillalsobeempty,ifyousetthesessionpersistencefeature,theserverwillsavethesessiontoyourharddriveWhentheserverprocessrestartortheinformationcanbeusedagain,WeblogicServersupportssustainablemannerincludingdocuments,databases,client-sidecookiepreservationandreproduction.

Strictlyspeakingnotapersistentcopysaved,becausethesessionisactuallystoredinmemory,butthesameinformationisreplicatedtoeachserverprocesswithinthecluster,soevenifaserverprocesstostopworkingandstillavailablefromotherprocessesobtainsession.

cookiesettingswillaffectthesurvivaltimeofthebrowsergeneratesasessioncookieisacookie.Thedefaultistouseasessioncookie.Interestedcanuseittotestusinthefourthquarter,asmentionedinthemisunderstanding.

cookiepathforthewebapplicationisaveryimportantoption,WeblogicServeronthedefaulthandlingofthisoptionmakesitsignificantlydifferentfromotherservers.Wewilldiscussthetopiclater.

Settingsonthesessionreference[5]/wls/docs70/webapp/weblogic_xml.html#1036869

6,HttpSessionFrequentlyAskedQuestions

(Inthissectiontheimplicationsforthesessionmixed⑤and⑥)

1,sessioniscreatedwhen

Acommonmisconceptionisthatthesessioninaclientvisit,wascreated,butthefactisthatuntilaserver-sideprogramcalledHttpServletRequest.getSession(true)whensuchastatementiscreated,notethatiftheJSPdoesnotappeartouse<%@pagesession="false"%>closedsession,theJSPfilewillbeautomaticallycompiledintoaServletwhentheinclusionofsuchastatementHttpSessionsession=HttpServletRequest.getSession(true);ThisisalsoimpliedinJSPsessionobjectorigin.

Asthesessionwillconsumememoryresources,soifyoudonotintendtousethesession,alltheJSPshouldbeturnedoffit.

2,sessionisdeletedwhen

Comprehensivediscussionsearlier,gramcallsHttpSession.invalidate();orb.fromthelasttimebeforetheclientsendsthesessionidthantheintervalsessiontimeoutsettings;orc.serverprocessisstopped(non-persistentsession)

3,howtododeletethebrowserclosedsession

Strictlyspeaking,cannotdothis.Approachcandoalittleeffortisallclientsusethejavascript代码window.oncolosepagetomonitorthebrowser'sclosingmovement,andthensendtotheservertodeleteaQingqiusession.Butthecollapseorforcedtokillthebrowserprocessisstillpowerlesstheseunconventionalmeans.

4,thereishowthematterHttpSessionListener

Youcancreatesuchalistenertomonitorthesessioncreationanddestructionevents,sointheeventofsuchaneventyoucandosomerelevantwork.Notethatsessioncreationanddestructionofactiontriggerlistener,notthereverse.SimilartothelistenerwiththeHttpSessionalsoHttpSessionBindingListener,HttpSessionActivationListenerandHttpSessionAttributeListener.

5,storedinasessionoftheobjectmustbeserializableforyou

Notrequired.Requestedobjectscanbeserializedonlytosessionintheclustercanbecopiedorsavedtoalastingortemporary,wherenecessary,thesessionservercanexchangethememory.ThesessioninWeblogicServercannotbeplacedinaserializedobjectintheconsolewillreceiveawarning.IusedaiPlanetversioniftherecannotbeserializedsessionobjectsinthesessiontherewillbeadestructionofException,verystrange.

6,howtocorrectlydealwiththepossibilityoftheclientagainstcookie

TheURLforallURLrewritingtouse,includinghyperlinks,formofaction,andtheredirectionofURL,thespecificapproach,see[6]

/wls/docs70/webapp/sessions.html#100770

7,opentwobrowserwindowstoaccesstheapplicationwillusethesamesessionoradifferentsession

Seethediscussionofthethirdsectionofthecookie,thesessionidisnotonlytherecognitionofidentification,sodifferentbrowsers,differentmethodsanddifferentwindowsopenthecookieisstoredwillaffecttheanswertothisquestion.

8,howtopreventtheusertoopentwobrowserwindowsoperatingsessionduetoconfusion

Thisissueistopreventmultiplesubmitsofsimilarform,youcansettosolvetheclient'stoken.Isgeneratedeachtimetheserverreturnsadifferentidtotheclient,whilepreservingthesession,theclientsubmitstheformmustalsoreturntheidserver,theprogramfirstcomparesthereturnofidandthevaluestoredinthesessionarethesamein,andifnotthenexplainthisoperationhasbeensubmittedbefore.Cansee"J2EECoreModel"onthepartofthelayermodel.Notethattheuseofjavascriptwindow.opentoopenthewindow,generallydonotsettheid,oruseaseparateid,topreventthemainwindowdoesnotoperate,itisrecommendednottoopenthewindowwindow.openmakechangestooperations,sothatyoucannotset.

9,whychangethesessioninWeblogicServertore-callafterthevalueofasession.setValue

InordertodothisactionismainlyintheclusterenvironmentpromptedWeblogicServersessioninthevaluehaschanged,needtocopytootherserverprocessesthevalueofthenewsession.

10Whyisgonesession

Ruleoutthefailurefactors,thenormalsession,theserveritselfwillbeverylittlepossibility,althoughtheauthorplusanumberofpatchesiniPlanet6SP1Solarisversionhasfaceddown;thepossibilityofbrowserplug-second,Ialsoencountered3721plug-incausedproblems;theoryfirewallorproxyserverincookiehandlingcouldalsobeaproblem.

Mostofthereasonsforthisproblemoccurs,theerrorsarethemostcommonisanapplicationtoaccessanotherapplication.Wediscussthisissueinthenextsection.

7,cross-applicationsharingsession

Oftensuchasituation,alargeprojectdividedintoanumberofsmallprojectdevelopment,inordertobeabletointerferencefromeachother,requiresthateachsmallitemasaseparatewebapplicationdevelopment,buttosuddenlyfindthatlastbetweenafewsmallprojectsneedtosharesomeinformation,orwanttousethesessiontoachieveSSO(singlesignon),storedinthesessionloginuserinformation,themostnaturalrequirementisthatbetweenapplicationscanaccesseachother'ssession.

However,inaccordancewiththeServletSpecification,sessionofthecurrentscopeshouldbelimitedtoapplicationprocedures,betweenthedifferentapplicationscannotaccesseachother'ssessionofeachother.Eachapplicationserver,bothfromthepracticaleffectofcompliancewiththisspecification,butimplementationdetailsmightvary,sotoaddresscross-applicationsessiontosharethemethodsaredifferent.

Firstofall,lookattheTomcatwebapplicationishowtoachieveisolationbetweenthesession,fromTomcattosetthecookiepathofview,itsapplicationindifferentsetcookiepathisdifferent,sodifferentapplicationsusedbythesessionidisdifferent,soeveninthesamebrowserwindowaccessdifferentapplications,senttotheserver'ssessionidcanbedifferent.

Accordingtothisfeature,wecanspeculateTomcatinthesessionmemorystructureasfollows.

I'veusedtheiPlanetalsousedthesameway,itisestimatedbetweenSunONEandiPlanetwillnotbemuchdifference.Fortheserverthisway,theideaisverysimpletosolve,theactualpracticeitisnotdifficult.Orallapplicationssharingasessionid,orlettheapplicationaccesstootherapplicationssessionid.

iPlanetthereisaverysimplewaytoachievesharingasessionid,thatisthepathofeachapplicationofthecookiearesetto/(infactshouldbe/NASApp,fortheapplicationintermsofitsfunctionsastheroot).

<session-info>

<path>/NASApp</path>

</Session-info>

Notethattheoperationofsomesharedsessionshouldfollowtheprogrammingconventions,suchassessionattributenameprecededbytheprefixoftheapplication,makingsetAttribute("name","neo")intosetAttribute("","neo"),toavoidnamespaceconflicts,leadingtooverwriteeachother.

InTomcatthechoiceisnotsoeasy.IntheTomcatversion3,wealsohavesomemeanstosharethesession.Forversion4andaboveTomcat,nowIhavenotyetfoundasimpleway.Withonlythepowerofthirdparties,suchuseoffiles,databases,JMS,orclient-sidecookie,URLparameterorhiddenfieldsandothermeans.

Let'slookathowtohandlesessionWeblogicServeristhe.

FromthescreenshotyoucanseetheWeblogicServerscreenallapplicationstosetthecookiepathis/,thismeanthatthedefaultintheWeblogicServercansharethesessionout?However,evenasmallexperimentcanprovethatdifferentapplicationsusethesamesession,eachapplicationisstillonlyhaveaccesstohisownsetofthoseattributes.ThisshowsthattheWeblogicServerinthefollowingsessionofthememorystructuremay

Forsuchastructure,themechanismitselfinthesessiontoresolvetheproblemsharingsessionshouldbeimpossible.Inadditiontothepowerbymeansofathirdparty,suchasusingfiles,databases,JMS,orclient-sidecookie,URLparameterorhiddenfieldsandothermeans,thereisamoreconvenientapproachistoputaServletContextapplicationsession,sothatAnotherapplicationcanbeobtainedfromtheServletContextreferencetothepreviousapplication.Samplecodeisasfollows,

ApplicationA

context.setAttribute("appA",session);

ApplicationB

contextA=context.getContext("/appA");

HttpSessio