这一部分主要讲xml的定义。

我们先来一个Spring的xml的定义

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="XMLComponentDAO"
        class="componentscan.XMLComponentDAO">
            <property name="jdbcConnection" ref="XMLComponentJdbcConnection"/>
    </bean>

    <bean id="XMLComponentJdbcConnection" class="componentscan.XMLComponentJdbcConnection">
    </bean>


</beans>

https://docs.spring.io/spring/docs/current/spring-framework-reference/core.html#beans-factory-xml-import