之前用xml文件配置也可实现控制反转,但注解方式更为方便
1、拷贝jar包
2、创建源路径包
3、配置applicationContext.xml文件
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
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/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.huaxin.edu"/>
</beans>
4、@Component(value=“userDao”)
相当于这句话
<bean id="userDao" class="com.huaxin.edu.bean.UserDao"></bean>
这句话
@Resource(name="userDao")
private UserDao userDao;
相当于 UserDao userDao= (UserDao )applicationContext.getBean(“userDao”);
同时Dao层用@Component或@Repository
Service层用@Service
Servlet层用@Controller
非常方便的用法