IOC Assembly Bean (Annotated Way)

Spring2.5 introducing the use of annotations to define beans

@Component describing beans in the spring framework

The Spring Framework provides three annotations equivalent to the @component annotations:

@Repository used to label DAO implementation classes

@Service used to label Service implementation classes

@Controller used to label the Controller implementation class

Three annotations are enhanced for subsequent releases.

Normal properties;

@Value (value= "Itcast")

Private String info;

Object properties:

@Autowired: Automatic assembly uses type injection by default.

@Autowired

@Qualifier ("Userdao")---injected by name.

@Autowired

@Qualifier ("Userdao")

Private Userdao Userdao;

Equivalent to

@Resource (name= "Userdao")

Private Userdao Userdao;

Configure the Bean initialization method and destroy method:

* Init-method and Destroy-method.

@PostConstruct initialization

@PreDestroy Destruction

Configure the scope of the bean:

@Scope