applicationContext讲解

        生成bean 豆子，bean工厂，对象的工厂

        id是对象名，豆子的名字，全项目唯一，class是类全路径名

        bean标签的底层实现是无参构造方法

                <bean id="book1" class="com.nz.entity.Book">

加载Spring主配置文件套路代码

ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

前期applicationContext代码

<?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"
      xmlns:aop="http://www.springframework.org/schema/aop"
      xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

</beans>