导入jar包：

　　进入项目结构：

选择文件夹：

选择jar包确定：

这里创建一些测试类：

package dao.impl;

import dao.IUserDao;

public class UserDaoImpl implements IUserDao {
    @Override
    public void getUser() {
        // 查询数据库
        System.out.println("查询MySQL");
    }
}

package dao;

public interface IUserDao {
    void getUser();
}

package service.impl;

import dao.IUserDao;
import dao.impl.UserDaoImpl;
import service.IUserService;

public class UserServiceImpl implements IUserService {

    IUserDao dao;

    public IUserDao getDao() {
        return dao;
    }

    public void setDao(IUserDao dao) {
        this.dao = dao;
    }

    @Override
    public void getUser() {
        dao.getUser();
    }
}

package service;

public interface IUserService {
    void getUser();
}

package test;

import dao.IUserDao;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import service.IUserService;
import service.impl.UserServiceImpl;

public class MyTest {
    public static void main(String[] args) {
        // 加载IOC
        ApplicationContext ioc = new ClassPathXmlApplicationContext("spring.xml");
        // 获取类实例
        IUserService service = ioc.getBean(IUserService.class);
        service.getUser();
    }
}

配置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 class="dao.impl.UserDaoImpl" id="userDao"/>
    <bean class="service.impl.UserServiceImpl" id="userService">
        <property name="dao" ref="userDao"/><!-- 将ref中的类注入到name对应的实例中 -->
    </bean>
</beans>