spring IOC基础

控制反转IOC是说创建对象的控制权进行转移，以前创建对象的主动权和创建时机是由自己把控的，而现在这种权力转移到第三方，比如转移交给了IOC容器，把创建对象的任务交给spring框架来完成
基础代码示意

package com;
import dao.AccountDaoImp;
import org.springframework.beans.factory.beanfactory;
import org.springframework.beans.factory.xml.Xmlbeanfactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClasspathXmlApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import util.Mybeanfactory;
public class test {
    public static void main(String[] args) throws ClassNotFoundException, illegalaccessexception, InstantiationException {
        
        //获取核心容器
        //饿汉模式
        ApplicationContext ac= new ClasspathXmlApplicationContext("bean.xml");
        //根据id获取bean对象
        AccountDaoImp ad= (AccountDaoImp) ac.getBean("myName");
        System.out.println(ad);
//        懒汉模式
        Resource resource=new ClassPathResource("bean.xml");
        beanfactory beanfactory=new Xmlbeanfactory(resource);
        AccountDaoImp ad2= (AccountDaoImp) beanfactory.getBean("myName");
    }
}

package dao;

public class AccountDaoImp implements IAccountDao{
    @Override
    public void say() {
        System.out.println("俺是工厂模式得模拟");
    }
}

<?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="myName" class="dao.AccountDaoImp"/>
</beans>