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1、英文原文Springcontainsalotoffunctionalityandfeatures,whicharewell-organizedinsevenmodulesshowninthediagrambelow.Thissectiondiscusseseachtheofmodulesinturn.TheCorepackageisthemostfundamentalpartoftheframeworkandprovidestheDependencyInjectionfeaturesallowingyo
2、utomanagebeancontainerfunctionality.ThebasicconcepthereistheBeanFactory,whichprovidesafactorypatternremovingtheneedforprogrammaticsingletonsandallowingyoutodecoupletheconfigurationandspecificationofdependenciesfromyouractualprogramlogic.OntopoftheCorepac
3、kagesitstheContextpackage,providingawaytoaccessbeansinaframework-stylemanner,somewhatresemblingaJNDI-registry.Thecontextpackageinheritsitsfeaturesfromthebeanspackageandaddssupportfortextmessagingusinge.g.resourcebundles,event-propagation,resource-loading
4、andtransparentcreationofcontextsby,forexample,aservletcontainer.TheDAOpackageprovidesaJDBC-abstractionlayerthatremovestheneedtodotediousJDBCcodingandparsingofdatabase-vendorspecificerrorcodes.Also,theJDBCpackageprovidesawaytodoprogrammaticaswellasdeclara
5、tivetransactionmanagement,notonlyforclassesimplementingspecialinterfaces,butforallyourPOJOs(plainoldjavaobjects).TheORMpackageprovidesintegrationlayersforpopularobject-relationalmappingAPIs,includingJDO,HibernateandiBatis.UsingtheORMpackageyoucanuseallth
6、oseO/R-mappersincombinationwithalltheotherfeaturesSpringoffers,likesimpledeclarativetransactionmanagementmentionedbefore.Spring'sAOPpackageprovidesanAOPAlliancecompliantaspect-orientedprogrammingimplementationallowingyoutodefine,forexample,method-interce
7、ptorsandpointcutstocleanlydecouplecodeimplementingfunctionalitythatshouldlogicallyspeakingbeseparated.Usingsource-levelmetadatafunctionalityyoucanincorporateallkindsofbehavioralinformationintoyourcode,alittlelike.NETattributes.Spring'sWebpackageprovidesb
8、asicweb-orientedintegrationfeatures,suchasmultipartfunctionality,initializationofcontextsusingservletlistenersandaweb-orientedapplicationcontext.WhenusingSpringtogetherwithWebWorkorStruts,thisisthepackagetointegratewith.Sp
