Spring IOC源码中，声明式事务入口点是如何实现的？

一、Spring 声明式事务的入口点 对于XML入口点 XML配置定义 <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx https://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd"> <tx:annotation-driven></tx:annotation-driven> <!-- dao bean--> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" > <property name="dataSource" ref = "dataSource"></property> </bean> <!-- service bean--> <bean id="bookService" class="org.yang.learn.spring.tx.BookService" > <property name="jdbcTemplate" ref="jdbcTemplate"></property> </bean> <!-- 数据源 bean--> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" > <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"></property> <property name="url" value="jdbc:mysql://192.168.40.171:3306/workflow_test?serverTimezone=Asia/Shanghai&amp;characterEncoding=utf8&amp;useSSL=false"/> <property name="username" value="user_dev"></property> <property name="password" value="dev-sny.com"></property> </bean> <!-- 事务管理bean--> <bean id="transactionManager" class="org.springframework.jdbc.support.JdbcTransactionManager" > <constructor-arg ref="dataSource"></constructor-arg> </bean> <aop:config> <!--切点配置 --> <aop:pointcut id="serviceOperation" expression="execution(* org.yang.learn.spring.tx.BookService.*(..)