使用注解的方式

1.引用jar包aop的jar包

2.配置文件使用包扫描

<context:component-scan base-package="com.zhiyou100.sh"></context:component-scan>

3.在相应的类加上注解

@Repository   持久化注解。

@Service 业务层注解

@Controller 控制层注解

@Autowired 自动注入 按照类型帮你自动注入，如果由多个类型相同的那么就会在按照名称注入。（建议使用这个）

@Resouce  自动注入 按照名称注入，如果没有相同名称的bean那么会按照类型帮你注入。 它可以指定名称来注入。

controller的代码

Service的代码

dao的代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    
    <bean id="UserDao" class="com.zhiyou100.sh.dao.UserDao"/>
    <bean id="UserService" class="com.zhiyou100.sh.service.UserService">
    <property name="dao" ref="UserDao"></property>
    </bean>
    <bean id="UserController" class="com.zhiyou100.sh.controller.UserController">
    <property name="service" ref="UserService"></property>
    </bean>


</beans>

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.zhiyou100.sh.controller.UserController;

public class test {
    public static void main(String[] args) {
        ApplicationContext app=new ClassPathXmlApplicationContext("app.xml");
        UserController bean = (UserController) app.getBean("UserController");
        bean.selectByid(1);
    }

} 

<?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-4.2.xsd">
    
    <context:component-scan base-package="com.zhiyou100.sh"></context:component-scan>


</beans>

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.zhiyou100.sh.controller.UserController;

public class test1 {
    public static void main(String[] args) {
        ApplicationContext app=new ClassPathXmlApplicationContext("app1.xml");
        UserController bean = (UserController) app.getBean("UserController");
        bean.selectByid(1);
    }

}