mybatis的配置主要分核心配置和映射文件;
映射文件由MapperScannerConfigurer类扫描文件夹并生成接口代理, SqlSessionFactoryBean类生成会话,核心配置由监听器加载
如果不使用监听时,可用SqlSessionFactory创建会话
web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <!-- 加载spring容器 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:spring*.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
</web-app>

spring-service.xml

<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:dubbo="http://code.alibabatech.com/schema/dubbo"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                            http://www.springframework.org/schema/beans/spring-beans.xsd
                            http://www.springframework.org/schema/mvc
                            http://www.springframework.org/schema/mvc/spring-mvc.xsd
                            http://code.alibabatech.com/schema/dubbo
                            http://code.alibabatech.com/schema/dubbo/dubbo.xsd
                            http://www.springframework.org/schema/context
                            http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 指定应用名称 -->
    <dubbo:application name="health_service_provider"/>
    <!--指定暴露服务的端口，如果不指定默认为20880-->
    <dubbo:protocol name="dubbo" port="20887"/>
    <!--指定服务注册中心地址-->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
    <!--批量扫描，发布服务-->
    <dubbo:annotation package="com.itheima.service"/>
</beans>

spring-redis.xml

<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:dubbo="http://code.alibabatech.com/schema/dubbo"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                            http://www.springframework.org/schema/beans/spring-beans.xsd
                            http://www.springframework.org/schema/mvc
                            http://www.springframework.org/schema/mvc/spring-mvc.xsd
                            http://code.alibabatech.com/schema/dubbo
                            http://code.alibabatech.com/schema/dubbo/dubbo.xsd
                            http://www.springframework.org/schema/context
                            http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 指定应用名称 -->
    <dubbo:application name="health_service_provider"/>
    <!--指定暴露服务的端口，如果不指定默认为20880-->
    <dubbo:protocol name="dubbo" port="20887"/>
    <!--指定服务注册中心地址-->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
    <!--批量扫描，发布服务-->
    <dubbo:annotation package="com.itheima.service"/>
</beans>

spring-dao.xml

<?xml version="1.0" encoding="UTF-8"?>
<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-4.2.xsd
							http://www.springframework.org/schema/context
							http://www.springframework.org/schema/context/spring-context.xsd
							http://www.springframework.org/schema/aop
							http://www.springframework.org/schema/aop/spring-aop.xsd
							http://www.springframework.org/schema/tx
							http://www.springframework.org/schema/tx/spring-tx.xsd
							http://www.springframework.org/schema/util
							http://www.springframework.org/schema/util/spring-util.xsd">

    <!--数据源-->
    <bean id="dataSource"
          class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
        <property name="username" value="root" />
        <property name="password" value="root" />
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/health?characterEncoding=UTF-8" />
    </bean>
    <!--spring和mybatis整合的工厂bean-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation" value="classpath:SqlMapConfig.xml" />
    </bean>
    <!--批量扫描接口生成代理对象-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--指定接口所在的包-->
        <property name="basePackage" value="com.itheima.dao" />
    </bean>
</beans>

sqlMapperConfig.xml

<?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>
    <plugins>
        <!-- com.github.pagehelper 为 PageHelper 类所在包名 -->
        <plugin interceptor="com.github.pagehelper.PageHelper">
            <!-- 设置数据库类型 Oracle,Mysql,MariaDB,SQLite,Hsqldb,PostgreSQL 六种数据库-->
            <property name="dialect" value="mysql"/>
        </plugin>
    </plugins>
</configuration>

spring-tx.xml

<?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"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/mvc
                        http://www.springframework.org/schema/mvc/spring-mvc.xsd
                        http://www.springframework.org/schema/tx
                        http://www.springframework.org/schema/tx/spring-tx.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 事务管理器  -->
    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--
        开启事务控制的注解支持
        注意：此处必须加入proxy-target-class="true"，
              需要进行事务控制，会由Spring框架产生代理对象，
              Dubbo需要将Service发布为服务，要求必须使用cglib创建代理对象。
    -->
    <tx:annotation-driven transaction-manager="transactionManager"
                          proxy-target-class="true"/>
</beans>

映射文件例:userDao.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.itheima.dao.UserDao">
    <select id="findByUsername" parameterType="string" resultType="com.itheima.pojo.User">
        select * from t_user where username = #{username}
    </select>

    <select id="findRoleIdByUserId" parameterType="int" resultType="int">
        SELECT role_id FROM t_user_role ur WHERE ur.user_id = #{id}
    </select>
    
    <select id="findMenuIdsByRoleId" parameterType="int" resultType="int">
        SELECT menu_id FROM t_role_menu rm WHERE rm.role_id = #{id}
    </select>
    
    <select id="findMenuByMenuId" parameterType="int" resultType="com.itheima.pojo.Menu">
        SELECT * FROM t_menu WHERE LEVEL = 1 AND id = #{id} ORDER BY path
    </select>
    
    <select id="findChildrenMenuByParentId" parameterType="int" resultType="com.itheima.pojo.Menu">
        SELECT * FROM t_menu WHERE parentMenuId = #{id} ORDER BY priority
    </select>
</mapper>