applicationContext-dao.xml配置文件

<?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    http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 加载数据库连接的资源文件 -->
    <context:property-placeholder location="classpath:properties/mysql_db.properties"/>
    <!-- 配置数据源   dbcp数据库连接池 -->
    <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!-- 配置sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 加载Mybatis全局配置文件 -->
        <property name="configLocation" value="classpath:config/sqlMapConfig.xml"/>
    </bean>

    <!-- 配置mapper扫描器 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 扫描包路径，如果需要扫描多个包中间用半角逗号隔开 -->
        <property name="basePackage" value="com.yyj.mapper"></property>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>

</beans>