spring整合mybatis

思路分析与实现

1、导包

<dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.7</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.6</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>
    <!--解决静态资源过滤问题-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

2、mvc结构(entity层、service层)

@Data
public class User {
    private long id;
    private String username;
    private String password;
    private String email;
    private String role;
    private int state;
}

public interface UserMapper {
    public List<User> selectUser();
}

实现一
public class UserServcieImpl implements UserMapper {
    private SqlSessionTemplate sqlSession;

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

    @Override
    public List<User> selectUser() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> users = mapper.selectUser();
        return users;
    }
}
实现二
public class UserServiceImpl2 extends SqlSessionDaoSupport implements UserMapper {
    @Override
    public List<User> selectUser() {
        return getSqlSession().getMapper(UserMapper.class).selectUser();
    }
}

3、配置（mybatis-config.xml、userMapper.xml、beans.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>
    <typeAliases>
        <package name="com.luo.entity"/>
    </typeAliases>
</configuration>

<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.luo.Mapper.UserMapper">
    <select id="selectUser" resultType="User">
        select * from easyuser;
    </select>
</mapper>

bean中可以单独写一部分spring-dao.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">

    <!-- datasource -->
    <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="username" value="root"/>
        <property name="password" value="admin"/>
        <property name="url" value="jdbc:mysql://121.40.55.199:3309/easyproject"/>
    </bean>
    <!-- sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="datasource"/>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/luo/Mapper/*.xml"/>
    </bean>
    <!-- session -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

</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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <import resource="spring-dao.xml"/>

    <bean name="userMapper" class="com.luo.Mapper.UserServcieImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>
    <bean name="userMapper2" class="com.luo.Mapper.UserServiceImpl2">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
</beans>

4、测试

public class MyTest {
    public static void main(String[] args) throws IOException {
//        String resource = "mybatis-config.xml";
//        InputStream inputStream = Resources.getResourceAsStream(resource);
//        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//        SqlSession sqlSession = sqlSessionFactory.openSession(true);
//
//        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
//        List<User> users = mapper.selectUser();
//        for (User user : users) {
//            System.out.println(user);
//        }
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        UserMapper userMapper = context.getBean("userMapper2", UserMapper.class);
        for (User user : userMapper.selectUser()) {
            System.out.println(user);
        }

    }
}

总结

其主要流程
(1)sqlSessionFactory对象管理配置
(2)sqlSession对象管理crud接口
(3)mapper对象执行操作。

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