SqlSessionFactory是mybatis的基礎中的基礎，必須實例！

邏輯思路：

它的實例化需要（依賴）'mybatis-config.xml'文件，

其中有三大抽象：1、數(shù)據(jù)源；2、別名；3、注冊mapper

可以把依賴（作為屬性）注入（DI）到SqlSessionFactoryBean中，來完成SqlSessionFactory的實例化。

pom：junit、webmvc、mysql-connector、spring-jdbc、mybatis、mybatis-spring、lombok

1、spring-dao.xml：bean約束

<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' 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'></beans>

2、db.properties

jdbc.driver=com.mysql.cj.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/數(shù)據(jù)庫?serverTimezone=GMT%2B8jdbc.username=rootjdbc.password=123

3、引入數(shù)據(jù)庫配置文件

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

4、從spring自帶jdbc配置數(shù)據(jù)源

<bean class='org.springframework.jdbc.datasource.DriverManagerDataSource'> <property name='driverClassName' value='${jdbc.driver}'/> <property name='url' value='${jdbc.url}'/> <property name='username' value='${jdbc.username}'/> <property name='password' value='${jdbc.password}'/></bean>

5、利用SqlSessionFactoryBean獲取配置SqlSessionFactory實例

<bean class='org.mybatis.spring.SqlSessionFactoryBean'> <property name='dataSource' ref='dataSource'/> <property name='mapperLocations' value='classpath*:mapper/*.xml'/> <property name='typeAliasesPackage' value='pojo'/> </bean>

6、掃描dao包，同時生成sqlsessionTemplate和注入mapper接口的實現(xiàn)類

<bean class='org.mybatis.spring.mapper.MapperScannerConfigurer'> <property name='basePackage' value='dao' /> <property name='sqlSessionFactoryBeanName' value='sqlSessionFactory'/></bean>

7、加載spring-dao.xml獲取上下文，從而為dao接口自動裝配

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext('spring/spring-dao.xml');StudentDao studentDao = (StudentDao) context.getBean('studentDao');List<Student> students = studentDao.selectAll();

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