spring 注解注入方式

1.xml配置开启注解

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	   xmlns:context="http://www.springframework.org/schema/context"
       xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="
	http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans.xsd
	http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd">

	<!-- 注解 -->
	<context:component-scan base-package="com.sxh.spring.annotaion"/>
</beans>

2.简单的注解例子

@Component("customerService")
//相当于<bean id="customerService"...>
public class CustomerService {
	@Value("lisi")
	//相当于<property name="name" value="lisi">
	private String name;
	public void list(){
		System.out.println("name:"+name);
		System.out.println("service list()...");
	}
}

3.框架常用注解（和上面@Component功能相同，区分层次）

@Controller--Action
@Service--Service
@Repository--Dao

4.复杂属性注入

//方式1:spring2.5规范
	@Autowired
	@Qualifier("customerDao1")
	private CustomerDao customerDao1;
	
	//方式2：JSR-250，需要配置<context:annotation-config/>
//<!-- 使@Resource，@PostConstruct,@PreDestory,@Autowired 生效 -->
	@Resource(name="customerDao2")
	private CustomerDao customerDao2;
	
	//方式3：JSR-443，需要javax.inject-1.jar
	@Inject
	@Named("customerDao3")
	private CustomerDao customerDao3;

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