Dependency injection assembly annotations based Bean

Dependency injection assembly annotations based Bean

• Note: is a class, use the annotation name @
• Development: Using annotations replace xml configuration file.

1.@Component取代<bean class="">

@Component("id") 取代 <bean id="" class="">

2.web development, provides annotations derived annotation @Component 3 (function as) a substituted

@Repository: dao layer

@Service: service layer

@Controller: web layer

3. dependency injection, private field is set to a value, may be set to a value setter methods

Normal values: @Value ( "")

Reference values:

Embodiment 1: [type] according injection

@Autowired

Embodiment 2: 1 injection according to [Name]

@Autowired

@Qualifier ( "name")

Embodiment 3: 2 according to [Name] injection

@Resource ( "name")

4. Life Cycle

Initialization: @PostConstruct

Destruction: @PreDestroy

5. Scope

@Scope ( "prototype") cases of

NOTE Using the premise, add a namespace, class notes let you scan a spring