Spring 1 IoC 4 注解

如果采用注解方式，下面代码

<!-- Inform Spring to scan the annotation within codes for DI requirements -->

<context:annotation-config/>

<!-- Inform Spring to scan the injectable components base on packages -->

<
context:component-scan
base-package
=
"com.apress.prospring3.ch4.annotation;com.apress.prospring3.ch4.annotation1"
>

<
context:exclude-filter
type
=
"assignable"
expression
=
"com.apress.prospring3.ch4.annotation1.Bean2"
/>

</
context:component-scan
>

自动扫描有下面注解的类：

@Component，
@Controller ，@Repository，
@Service

@Service ("messageRenderer" )

public
class
StandardOutMessageRenderer
implements
MessageRenderer {

@Autowired

在构造方法上添加
@Autowired，只能在一个构造方法上,然后要创建一个bean，用作构造方法的参数，下面用index方式创建

<bean id = "message" class="java.lang.String"
c:_0="this is a c:_0"/>

在Setter方法上

@Autowired

//@Resource(name="messageProvider") // Effect is the same as Autowired

public
void
setMessageProvider(MessageProvider provider) {

this
.
messageProvider
= provider;

}

@Value，注入SpEL表达式

@Value("${app.ctx}")

private String _ctxPath;

@PostConstruct和PreDestroy：通过注解指定初始化和销毁方法定义