@Mapper

public interface ProductDao {

    @Select("select * from product")

    List<Product> findAll() throws Exception;

}

@Service

@Transactional

public class ProductServiceImpl implements ProductService {

    @Autowired

    private ProductDao productDao;

    @Override

    public List<Product> findAll() throws Exception {

        return productDao.findAll();

    }

}

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

       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 http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--配置注解扫描，扫描service和dao-->

    <context:component-scan base-package="com.rao.travel.service"/>

    <context:component-scan base-package="com.rao.travel.dao"/>

    <!--引入数据库配置文件-->

    <context:property-placeholder location="classpath:db.properties"/>

    <!--配置连接池-->

    <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}"/>

    </bean>

    <!--配置session工厂-->

    <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

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

    </bean>

    <!--扫描dao接口-->

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

        <property name="basePackage" value="com.rao.travel.dao"/>

    </bean>

    <!--配置事务管理器-->

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

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

    </bean>

    <!--开启事务注解-->

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

</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"

       xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:aop="http://www.springframework.org/schema/aop"

       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 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--扫描所有包下的注解-->

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

    <!--配置视图解析器-->

    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/pages/"/>

        <property name="suffix" value=".jsp"/>

    </bean>

    <!-- 设置静态资源不过滤 -->

    <mvc:resources location="/css/" mapping="/css/**" />

    <mvc:resources location="/img/" mapping="/img/**" />

    <mvc:resources location="/js/" mapping="/js/**" />

    <mvc:resources location="/plugins/" mapping="/plugins/**" />

    <!-- 开启对SpringMVC注解的支持 -->

    <mvc:annotation-driven/>

    <!--aop的动态代理使用cglib-->

    <aop:aspectj-autoproxy proxy-target-class="true"/>

</beans>