1.入门程序

1.基础包
下载地址：
https://repo.spring.io/libs-release-local/org/springframework/spring/4.3.6.RELEASE/
http://commons.apache.org/proper/commons-logging/download_logging.cgi

2.获取配置文件的约束信息：
位置：

3.约束信息+版本信息号（版本信息号就是下图中xsd但是要把它改成对应的版本即可不用在复制额外的行）
使用浏览器打开

package com.itheima.ioc;

public interface UserDao {

	public void say();
}

package com.itheima.ioc;

public class UserDaoImpl implements UserDao {

	@Override
	public void say() {
		// TODO Auto-generated method stub
          System.out.println("userDao say hello World!");
	}

}

<?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-4.3.xsd">
       <!--  将指定类配置给Spring，让Spring创建其对象的实例 -->
        <bean id="userDao" class="com.itheima.ioc.UserDaoImpl"/>
        </beans>

package com.itheima.ioc;

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

public class TestIoC {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

	//1.初始化spring容器，加载配置文件
		ApplicationContext applicationContext=
				new ClassPathXmlApplicationContext("applicationContext.xml");
		//2.通过容器获取userDao实例
		UserDao userDao=(UserDao)applicationContext.getBean("userDao");
		//3.调用实例中的say()方法
		userDao.say();
	}

}

运行结果：