20200114-- implement transaction-based control of aop xml

The main configuration file

    <aop:config>
        <aop:pointcut id="pt1" expression="execution(* com.itheima.service.impl.*.*(..))"></aop:pointcut>
        <aop:aspect id="txAdvice" ref="txManager">
            <aop:before method="beginTransaction" pointcut-ref="pt1"></aop:before>
            <aop:after-returning method="commit" pointcut-ref="pt1"></aop:after-returning>
            <aop:after-throwing method="rollback" pointcut-ref="pt1"></aop:after-throwing>
            <aop:after method="release" pointcut-ref="pt1"></aop:after>
        </aop:aspect>
    </aop:config>