SpringMVC + MyBatis整合

网络上关于这个架构的搭建文章，实在是太多了，本文是对于本人初次搭建时的一些注意点的整理。

主要是一些配置文件的内容和架构的目录。

0. project 目录

1. spring-resources.xml

这个文件是用来完成spring和mybatis的整合的xml。注意properties文件的读入方式。

<?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:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:tx="http://www.springframework.org/schema/tx" 
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="  
    http://www.springframework.org/schema/beans   
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
    http://www.springframework.org/schema/tx   
    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd   
    http://www.springframework.org/schema/context   
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/aop        
    http://www.springframework.org/schema/aop/spring-aop-3.2.xsd" 
    default-autowire="byName" default-lazy-init="false">
     
    <!-- 自动扫描组件，需要把controller去掉，否则影响事务管理 --> 
    <context:component-scan base-package="org.com.mars">  
        <context:exclude-filter type="regex" 
            expression="org.com.mars.controller.*" />  
    </context:component-scan>
 
    <!-- 引入jdbc配置文件 --> 
    <context:property-placeholder location="classpath:prop/jdbc.properties" /> 
 
    <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx --> 
    <bean id="transactionManager" 
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">  
        <property name="dataSource" ref="dataSource" />  
    </bean> 
     
    <!-- 声明式事务管理 -->
    <aop:config>  
        <aop:advisor pointcut="execution(* org.com.mars.service..*.*(..))" 
            advice-ref="myAdvice" />  
    </aop:config>  
    <tx:advice id="myAdvice" transaction-manager="transactionManager">  
        <tx:attributes>  
            <tx:method name="find*" propagation="SUPPORTS" read-only="true" />  
            <tx:method name="query*" propagation="SUPPORTS" read-only="true" />  
            <tx:method name="list*" propagation="SUPPORTS" read-only="true" />  
   
            <tx:method name="create*" propagation="REQUIRED" />  
            <tx:method name="save*" propagation="REQUIRED" />  
            <tx:method name="modify*" propagation="REQUIRED" />  
            <tx:method name="update*" propagation="REQUIRED" />  
            <tx:method name="delete*" propagation="REQUIRED" />  
   
            <tx:method name="*" propagation="SUPPORTS" read-only="true" />  
        </tx:attributes>  
    </tx:advice>  
     
    <!-- 创建SqlSessionFactory，同时指定数据源 --> 
    <bean id="mySqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">  
        <property name="dataSource" ref="dataSource" />  
        <!-- 自动扫描entity目录, 省掉Configuration.xml里的手工配置 -->
        <property name="mapperLocations" value="classpath*:maper/*.map.xml" />
    </bean> 
     
    <!-- DAO接口所在包名，Spring会自动查找其下的类 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">  
        <property name="basePackage" value="org.com.mars.dao" />
        <property name="sqlSessionFactoryBeanName" value="mySqlSessionFactory" />
    </bean>
     
    <!-- 可通过注解控制事务 --> 
    <tx:annotation-driven />
     
    <!-- 数据库连接池 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <!-- Connection Info -->
        <property name="driverClassName" value="${jdbc.driver}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
 
        <!-- Connection Pooling Info -->
        <property name="maxActive" value="${dbcp.maxActive}" />
        <property name="maxIdle" value="${dbcp.maxIdle}" />
        <property name="defaultAutoCommit" value="false" />
        <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="3600000" />
        <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="3600000" />
    </bean>
</beans>

2. mapper.xml

该xml 如何使用配置，请参看spring-resources.xml，注意mapper.xml中 namespace的配置。

<?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="org.com.mars.dao.test.UserDao">
 
 <!-- mapping -->
 <resultMap id="User_t" type="org.com.mars.pojo.test.User">
 <result property="userId" column="user_id" jdbcType="VARCHAR" />
 <result property="userName" column="user_name" jdbcType="VARCHAR" />
 </resultMap>
 
 <sql id="columns">
 user_id,
 user_name
 </sql>
 
 
 <!-- 根据ID查询用户信息 -->
 <select id="queryUserById" resultMap="User_t">
 SELECT
 <include refid="columns" />
 FROM
 user_t
 WHERE
 user_id = #{userId}
 </select>
 
</mapper>