4.ssm整合：Spring层

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <typeAliases>
        <package name="com.kuang.pojo"/>
    </typeAliases>
    <mappers>
        <mapper class="com.kuang.dao.BookMapper"/>
    </mappers>
</configuration>

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!--   1.关联数据库文件 -->
    <context:property-placeholder location="classpath:database.properties"/>
<!--    2.连接池
 1.dbcp:半自动化操作（不能自动连接）
 2.c3p0:自动化操作，（自动化加载配置文件，并且可以自动设置到对象中）
 druid:
 -->
    <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连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>
<!--    3.sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
<!--     绑定mybatis配置文件   -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
<!--   配置Dao接口扫描包，动态实现Dao接口可以实现注入到Spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--  要扫描的dao包  -->
        <property name="basePackage" value="com.kuang.dao"/>
    </bean>




</beans>

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!--  1.扫描service下的包  -->
    <context:component-scan base-package="com.kuang.service"/>
<!--  2.将我们所有的业务类注入到Spring中，可以通过注解或者配置实现  -->
    <bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>

<!--   3.声明式事务配置 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!--        注入数据源 -->
        <property name="dataSource" ref="dataSource"/>

    </bean>
<!--   4.aop(横切)事务支持 -->
</beans>