1.配置Spring整合Mybatis，我們這裡的資料來源使用c3p0連線池

2.編寫Spring整合Mybatis的相關配置檔案:spring-dao.xml

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

    <!--        1.關聯資料庫配置檔案-->
    <context:property-placeholder location="classpath:database.properties"/>
    <!--2.連線池
    dbcp:半自動化，不能自動連線
    -c3p0:自動化操作，自動化載入配置檔案，並且可以自動設定到物件中
    druid
    hikari-->
<!-- 配置連線池屬性-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

<!--        c3p0連線池的私有屬性-->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
<!--        關閉連線後不自動commit-->
        <property name="autoCommitOnClose" value="false"/>
<!--        獲取超時時間-->
        <property name="checkoutTimeout" value="10000"/>
<!--        當獲取連結池失敗重試次數-->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>
<!--3.sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
<!--        繫結Mybatis配置檔案-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
<!--    配置dao介面掃描包，動態實現Dao介面可以注入到Spring容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--        注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!--        要掃描的包-->
        <property name="basePackage" value="com.luo.dao"/>
    </bean>
</beans>

3.spring整合service層

spring-service.xml

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

<!--        1.掃描service下的包-->
    <context:component-scan base-package="com.luo.service"/>
<!--    2.將我們所有的業務類，注入到Spring中，可以通過配置，或者註解實現-->
    <bean id="BookServiceImpl" class="com.luo.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>
<!--    3.宣告式事務配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!--        注入資料來源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>
<!--    4.aop事務支援-->
</beans>

 applicationContext.xml: