applicationContext.xml配置druid连接池

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
    
    <!-- 1.加载jdbc.properties文件的位置 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    
    <!-- 2.配置druid连接池 ，id是固定值，class是druid连接池类的全路径 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <!-- 配置连接数据库的基本信息 -->
        <property name="driverClassName" value="${db.driverClassName}"></property>
        <property name="url" value="${db.url}"></property>
        <property name="username" value="${db.username}"></property>
        <property name="password" value="${db.password}"></property>
    </bean>
    
    <!-- 3.整合spring和mybatis框架    
        将SqlSession等对象的创建交给Spring容器
        id值(sqlSessionFactory)是固定值
     -->
    <bean id="sqlSessionFactory" 
        class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 3.1.指定mybatis核心配置文件的位置 -->
        <property name="configLocation" 
                value="classpath:mybatis/mybatis-config.xml"></property>
        <!-- 3.2.配置连接池(数据源) ref指向连接池bean对象的id值 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 3.3、扫描所有的 XxxMapper.xml映射文件，读取其中配置的SQL语句 -->
        <property name="mapperLocations" value="classpath:mybatis/mapper/*.xml"/>
    </bean>
    
    <!-- 4、定义mapper接口扫描器 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 扫描所有XxxMapper接口，将接口实例的创建交给spring容器 -->
        <property name="basePackage" 
            value="com.tsvv.dao"/>
    </bean>
    
    <!-- 5.配置需要扫描的包(service层)：spring自动去扫描 base-package下的类，
        如果扫描到的类上有 @Controller、@Service、@Component等注解，
        将会自动将类注册为bean（即由spring创建实例）
     -->
    <context:component-scan 
        base-package="com.tsvv.service">
    </context:component-scan>

</beans>

jdbc.properties：

db.driverClassName=com.mysql.jdbc.Driver
db.url=jdbc:mysql:///yonghedb?characterEncoding=utf-8
db.username=root
db.password=root