Spring Web Flow.pdf

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1、#86CONTENTSINCLUDE:nAboutSpringWebFlownDistillingSpringWebFlownInstallingSpringWebFlowSpringWebFlownDefiningaFlownStatesnTransitionsandmore...ByCraigWallsVisitrefcardz.comRequestRequestscopeiscreatedatthebeginningofanHTTPrequestanddestroyedABOUTSPRINGWEBFLOWattheendoftherequest.Datainreques

2、tscopeisavailabletoallstatesforthedurationoftherequest(whichmayspanmultiplestatesandevenstretchbeyondviewboundaries).Manywebsitesemployfree-formnavigation,allowinguserstoFlashFlashscopeiscreatedwhenaflowbegins,wipedcleanwhenaviewisrendered,findtheirownwayaround.Butsometimesit’sbetterforaweb

3、anddestroyedattheendofaflow.Datainflashscopeisavailabletoallstateswithinaflowforthedurationofthecurrentrequest.Flashscopediffersfromapplicationtoguidetheuseraround,takingthemfromonerequestscopeinthatflashscopewillbeclearedwhenaviewisrendered,butarequestmayspanmultipleviews(ifaviewredirects,

4、forexample).steptothenext.Ashoppingcartonane-commercesiteisaViewViewscopeiscreatedwhentheflowentersaviewstateanddestroyedwhenfamiliarexampleofanapplicationleadingauserinsteadofthetheviewisrendered.Becauseofitsshortlifespan,datainviewscopeisonlyotherwayaround.availablewithintheviewstatethati

5、twascreated.Thefollowingdiagramillustratesthelifespanofeachscope:BasedonSpringMVC,SpringWebFlowisaframeworkforbuildingflow-basedapplications.InthisRefcard,you’llseehowtoaddSpringWebFlowtoaSpringapplicationanddefineflowsthatinitiateconversationsbetweentheapplicationanditsusers.DISTILLINGSPRI

6、NGWEBFLOWAllflowsaremadeupofthreeessentialelements:States,INSTALLINGSPRINGWEBFLOWTransitionsandFlowData.StatesAddingSpringWebFlowtotheclasspathWithinaflowstuffhappens.EithertheapplicationperformsAddingSpringWebFlowtoyourapplicationstartswithsomelogic,theuseranswersaquestionorfillsoutaform,o

7、rmakingtheSpringWebFlowlibrariesavailableinyouradecisionismadetodeterminethenextsteptotake.Theproject’sclasspath.Atveryleast,thismeansthefollowingJARpointsintheflowwherethesethingshappenareknownasfiles(namedastheyaredistributedintheSpringWebFlowstates.do