Spring整合Mybatis

导入spring、mybatis相关jar包，

<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
</dependency>
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.2</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.47</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.1.10.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>5.1.10.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver aspectJ AOP 织入器-->
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.9.4</version>
</dependency>
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>2.0.2</version>
</dependency>
<!-- 配置Maven静态资源过滤问题！-->
<build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>true</filtering>
        </resource>
    </resources>
</build>

整合基于Mybatis搭建完成的环境，Mybatis搭建准备

整合方式一：

1、创建applicationContext.xml

2、将mybatis数据源配置转为bean配置，删除mybatis原有配置

3、将工具类转为bean配置，同时关联mybatis-config.xml文件，删除mybatis原有配置

4、新增Dao实现类，使用bean配置的工具类SessionTemplate，同时注册到Spring容器

5、测试

具体实现如下：

 1、applicationContext.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--配置数据源：数据源有非常多，可以使用第三方的，也可使使用Spring的-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf8"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>

    <!--配置SqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--关联Mybatis-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/alan/dao/mapping.xml"/>
    </bean>

    <!--注册sqlSessionTemplate , 关联sqlSessionFactory-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--利用构造器注入-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

    <bean id="userDao" class="com.alan.dao.UserDaoImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>
</beans>

2、dao实现类

public class UserDaoImpl implements UserDao {

    //sqlSession不用我们自己创建了，Spring来管理
    private SqlSessionTemplate sqlSession;

    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }

    public List<User> selectUser() {
        UserDao mapper = sqlSession.getMapper(UserDao.class);
        return mapper.selectUser();
    }
}

3、mybatis-config.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>

</configuration>

4、测试

public class MyTest {
    @Test
    public void test2(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserDao mapper = (UserDao) context.getBean("userDao");
        List<User> user = mapper.selectUser();
        System.out.println(user);
    }
}

整合方式二：

dao继承Support类 , 直接利用 getSqlSession() 获得 , 然后直接注入SqlSessionFactory .

比起方式1 , 继承SqlSessionSupport后不再需要SqlSessionTemplate，而且对事务的支持更加友好 . 可跟踪源码查看

SqlSessionDaoSupport