spring通过导入jar包和配置xml文件启动的步骤详解

//这是目录结构中的IUserDao接口类
package dao;

/**
 * @program: Spring_01
 * @description
 * @author: 
 * @create: 2020-08-05 16:16
 **/
public interface IUserDao {
  void getUser();
}

//这是目录结构中的IUserDao接口类的实现
package dao.impl;

import dao.IUserDao;

/**
 * @program: Spring_01
 * @description
 * @author:
 * @create: 2020-08-05 16:36
 **/
public class UserDaoOracleImpl implements IUserDao {

  @Override
  public void getUser() {
    System.out.println("查询的是Oracle数据库");
  }
}

//这是目录结构中的IUserService接口类
package service;

/**
 * @program: Spring_01
 * @description
 * @author: 
 * @create: 2020-08-05 08:51
 **/
public interface IUserService {

  void getUser();
}

//这是目录结构中的IUserService接口类的实现
package service.impl;

import dao.IUserDao;
import service.IUserService;

/**
 * @program: Spring_01
 * @description
 * @author: 
 * @create: 2020-08-05 08:52
 **/
public class UserServiceImpl implements IUserService {

  IUserDao dao_oracle;

  public IUserDao getDao_oracle() {
    return dao_oracle;
  }

  public void setDao_oracle(IUserDao dao_oracle) {
    this.dao_oracle = dao_oracle;
  }

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

//这是目录结构中的MyTest测试类的实现
package test;

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

/**
 * @program: Spring_01
 * @description
 * @author: 
 * @create: 2020-08-05 16:20
 **/
public class MyTest {
  public static void main(String[] args) {
  
    ApplicationContext ioc = new ClassPathXmlApplicationContext("spring.xml");
    
    IUserService service = ioc.getBean(IUserService.class);
    
    service.getUser();
  }
}

<?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.UserDaoOracleImpl" id="userDaoOracle"/>
  <bean class="service.impl.UserServiceImpl" id="userService">
    <property name="dao_oracle" ref="userDaoOracle"/>
  </bean>

</beans>