Spring4学习（二）简单的注解-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_17429/article/details/82677474

本文介绍如何在Spring框架中使用注解进行依赖注入及组件扫描配置，并通过具体示例展示了@Service和@Component注解的应用。

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使用Spring注解，首先需要安装spring-aop.jar包，在配置文件中添加开启注解的配置

<?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"
    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">
	<!-- 使用spring注解  -->
   <!--  <context:annotation-config/> -->
    <!-- 下面的配置告诉spring容器自动scanner用注解标注bean -->
   <context:component-scan base-package="org.lian"/>

</beans>

下面是使用注解的简单的实例

@Service("contactsManagerService")
public class ContactsManagerServiceImpl implements ContactsManagerService {

	private ContactsManagerDao contactsManagerDao;

	public ContactsManagerDao getContactsManagerDao() {
		return contactsManagerDao;
	}

	@Qualifier("contactsManagerDao")
	@Autowired
	public void setContactsManagerDao(ContactsManagerDao contactsManagerDao) {
		this.contactsManagerDao = contactsManagerDao;
	}

	@Override
	public String getContacts() {
		return contactsManagerDao.get();
	}

}

@Component("contactsManagerDao")
public class ContactsManagerDaoImpl implements ContactsManagerDao {

	@Override
	public String get() {
		String value = "ContactsDao.get()";
		return value;
	}

}

单元测试类

public class App {

	public static void main(String[] args) {
		String classPath = "classpath*:conf/spring/app_*.xml";
		// ApplicationContext context = new ClassPathXmlApplicationContext(
		// new String[] { "services.xml", "daos.xml" });
		ApplicationContext context = new ClassPathXmlApplicationContext(classPath);
		GroupManagerService service = context.getBean(GroupManagerService.class);
		System.out.println(service.getGroup());
		ContactsManagerService service2 = context.getBean("contactsManagerService",
				ContactsManagerService.class);
		System.out.println(service2.getContacts());

	}
}