<!-- ========================引入spring关于注解开发的context约束======================== -->
<?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.xsd">


</beans>

package spring.day2.demo1;

public interface UserDao {
    public void save();
}

package spring.day2.demo1;

public class UserDaoImp1 implements UserDao {

    @Override
    public void save() {
        System.out.println("userdao的save方法已经执行.......");
    }

}

package spring.day2.demo1;

import org.junit.Test;

/*
 * IOC注解开发入门
 */
public class SpringDemo1 {
    @Test
    /*
     * 传统方式
     */
    public void demo1() {
        UserDao userDao = new UserDaoImp1();
        userDao.save();
    }
}

@Test
    /*
     * IOC的注解方式
     */
    public void demo2() {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext3.xml");
        UserDao bean = (UserDao) applicationContext.getBean("userDao");
        bean.save();
    }