Class.forName(driverClass);

 DriverManager.getConnection(url,user,password);

<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"

       xmlns:tx="http://www.springframework.org/schema/tx"

       xmlns:jpa="http://www.springframework.org/schema/data/jpa"

       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd

        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd

        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <!--1 配置数据源-->

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">

        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>

        <property name="username" value="root"/>

        <property name="password" value="root"/>

        <property name="url" value="jdbc:mysql:///db_name"/>

    </bean>

    <!--2 配置EntityManagerFactory-->

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">

        <property name="dataSource" ref="dataSource"/>

        <property name="jpaVendorAdapter">

            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>

        </property>

        <property name="packagesToScan" value="com.imooc"/>

        <property name="jpaProperties">

            <props>

                <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>

                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>

                <prop key="hibernate.show_sql">true</prop>

                <prop key="hibernate.format_sql">true</prop>

                <prop key="hibernate.hbm2ddl.auto">update</prop>

            </props>

        </property>

    </bean>

    <!--3 配置事务管理器-->

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">

        <property name="entityManagerFactory" ref="entityManagerFactory"/>

    </bean>

    <!--4 配置支持注解的事务-->

    <tx:annotation-driven transaction-manager="transactionManager"/>

    <!--5 配置spring data-->

    <jpa:repositories base-package="com.imooc" entity-manager-factory-ref="entityManagerFactory"/>

    <context:component-scan base-package="com.imooc"/>

</beans>