Spring-bean (annotation mode-management and Dependency injection)

Bean Management (Annotation method)

1. Add a dependency package for annotations: Spring-aop.jar

2, the introduction of the configuration of spring XML file (check the official source)

3. Open the scanning of annotations

<context:component-scan base-pachage= "file directory path required for annotation scanning"/>

4, in the injected class using annotation injection: @Component ("id")

To distinguish between three-tier architectures using different annotations (the effect is consistent, just to differentiate)

@Repository:d AO layer

@Service: Service Layer

@Controller: Controller Layer

5. Using annotations: Consistent with XML

Attribute injection (annotation mode)

Simple properties

@Value ("attribute value")-------if no setter method can be added directly to the property, if there is a setter method that needs to be added to the setter method

Bean Injection

@Autowired

@Qualifier ("name")

autowired automatically injected by type, if there are two types of the same type by name injection requires another annotation to work with

@Resource (name= "name")--------provides support for JSR-250, consistent with the previous two annotations

Initialization and destruction method annotations

@PostConstruct---------Initialization

@PreDestroy--------Destruction (singleton mode Scope=singleton valid)

Scope of Action annotations

@Scope-------Default Singleton

Spring-bean (annotation mode-management and Dependency injection)