spring--整合mybatis_<bean id="usermapper-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_45685359/article/details/106177502

本文介绍了如何将Mybatis与Spring进行整合，包括两种整合方式。第一步涉及导入所需jar包，编写配置文件；第二步回顾Mybatis的基础设置，如实体类、Mapper接口等；第三步详述了mybatis-spring的两种整合方法，包括配置数据源、SqlSessionFactory，以及Mapper接口的实现和测试。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

整合mybatis

步骤：
1、导入相关的jar包

junit
mybatis
mysql
spring相关
mybatis-spring
aop织入

2、编写配置文件
3、测试

1.1、回忆前面学的mybatis

1、在pom文件导入jar包

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.4</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</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>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>
        </dependency>
    </dependencies>

2、编写实体类

@Data
public class User {
    private int id;
    private String name;
    private String pwd;
}

3、编写UserMapper接口

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

4、编写UserMapper接口对应的配置文件UserMapper.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.ljy.mapper.UserMapper">

    <select id="getUserList" resultType="User">
        select * from user
    </select>

</mapper>

5、编写mybatis核心配置文件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>


    <!--别名-->
    <typeAliases>
        <package name="com.ljy.pojo"/>
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>  <!--transactionManager   事物管理器-->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <!--这个容易忘   一定要注册进去-->
    <mappers>
        <mapper class="com.ljy.mapper.UserMapper"/>
    </mappers>

</configuration>

6、测试

public class MyTest {
    public static void main(String[] args) throws IOException {
        String resources = "mybatis-config.xml";
        InputStream in = Resources.getResourceAsStream(resources); //获取资源流文件
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(in); //SqlSessionFactoryBuilder sql会话工厂生成器
        SqlSession sqlSession = sessionFactory.openSession(true);
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> userList = mapper.getUserList();
        for (User user : userList) {
            System.out.println(user);
        }
        sqlSession.close();
    }
}

1.2、mybatis-spring

整合方式一

1、创建spring配置文件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
        https://www.springframework.org/schema/beans/spring-beans.xsd">

</beans>

2、在applicationContext.xml配置数据源

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd">


    <!--配置数据源 DataSource     替换掉mybatis中的数据源-->
    <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=UTF-8"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>

</beans>

3、在applicationContext.xml中配置SqlSessionFactory

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd">


    <!--配置数据源 DataSource     替换掉mybatis中的数据源-->
    <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=UTF-8"/>
        <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/ljy/mapper/UserMapper.xml"/>
    </bean>
</beans>

4、注册sqlSessionTemplate

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd">


    <!--配置数据源 DataSource     替换掉mybatis中的数据源-->
    <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=UTF-8"/>
        <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/ljy/mapper/UserMapper.xml"/>
    </bean>

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

5、增加mapper接口的实现类

public class UserMapperImpl implements UserMapper {

    private SqlSessionTemplate sqlSessionTemplate;
    public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate){
        this.sqlSessionTemplate=sqlSessionTemplate;
    }
    public List<User> getUserList() {
        UserMapper mapper = sqlSessionTemplate.getMapper(UserMapper.class);
        return mapper.getUserList();
    }
}

6、在spring中注册bean

<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
        https://www.springframework.org/schema/beans/spring-beans.xsd">


    <!--配置数据源 DataSource     替换掉mybatis中的数据源-->
    <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=UTF-8"/>
        <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/ljy/mapper/UserMapper.xml"/>
    </bean>

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

    <!--注册bean-->
    <bean id="userMapperImpl" class="com.ljy.mapper.UserMapperImpl">
        <property name="sqlSessionTemplate" ref="sqlSession"/>
    </bean>
</beans>

7、测试

 @Test
    public void Test2(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper mapper = context.getBean("userMapperImpl", UserMapper.class);
        List<User> userList = mapper.getUserList();
        for (User user : userList) {
            System.out.println(user);
        }
    }

这时mybatis的配置文件mybaatis-config.xml简化如下：

<?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>

    <!--别名-->
    <typeAliases>
        <package name="com.ljy.pojo"/>
    </typeAliases>
</configuration>

整合方式二

1、创建userMapper接口的实现类，继承SqlSessionDaoSupport类

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper{
    public List<User> getUserList() {
        UserMapper mapper = getSqlSession().getMapper(UserMapper.class);
        return mapper.getUserList();
    }
}

2、在spring配置文件中，注册bean

<bean id="userMapperImpl2" class="com.ljy.mapper.UserMapperImpl2">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

3、测试