spring学习之spring的ioc基本使用

1导入依赖

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.2</version>
        </dependency>
    </dependencies>

2写测试mapper

public interface UserMapper {
    
    
    void findById();
}

public class UserMapperImpl implements UserMapper {
    
    


    @Override
    public void findById() {
    
    
        System.out.println("调用成功");
    }
}

3.编写applicationContext.xml

<?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="userMapper" class="top.chenyp.mapper.impl.UserMapperImpl"/>

</beans>

4.使用spring的容器获取mapper类并使用

public static void main(String[] args) {
    
    

        ApplicationContext ac =new ClassPathXmlApplicationContext("applicationContext.xml");

        UserMapper userMapper = (UserMapper) ac.getBean("userMapper");

        userMapper.findById();


    }