Spring 整合MyBatis

1.导入依赖同时设置扫描dao下面的.xml文件

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.22</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.16</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

 <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>com/zzy/dao/*.xml</include>
                </includes>
            </resource>
        </resources>
    </build>

2.配置数据源

<!--    注入数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/books?serverTimezone=UTC"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>

3.注入sqlSessionFactoryBean和sqlSessionTemplate

<!--    注入sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:com/zzy/dao/*.xml"/>
    </bean>

    <!--    注入sqlSessionTemplate-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

4.创建实体类

package com.zzy.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {

    private int id;
    private String username;
    private String address;
}

5.创建mapper接口

package com.zzy.dao;

import com.zzy.pojo.User;

import java.util.List;

public interface UserMapper {

    List<User> findAllUser();
}

6.创建mapper.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.zzy.dao.UserMapper">

    <select id="findAllUser" resultType="com.zzy.pojo.User">
        select * from user
    </select>

</mapper>

7.实现mapper接口

package com.zzy.dao;

import com.zzy.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

public class UserMapperImpl implements UserMapper {

    private SqlSessionTemplate sqlSessionTemplate;

    public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
        this.sqlSessionTemplate = sqlSessionTemplate;
    }

    public List<User> findAllUser() {
        UserMapper mapper = sqlSessionTemplate.getMapper(UserMapper.class);
        return mapper.findAllUser();
    }
}

8.注入实现mapper接口的类

<!--    注入UsrMapperImpl-->
    <bean id="UsrMapperImpl" class="com.zzy.dao.UserMapperImpl">
        <property name="sqlSessionTemplate" ref="sqlSession"/>
    </bean>

9.完整的配置文件

<?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">

    <!--    注入数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/books?serverTimezone=UTC"/>
        <property name="username" value="winds"/>
        <property name="password" value="peng970429"/>
    </bean>

    <!--    注入sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:com/zzy/dao/*.xml"/>
    </bean>

    <!--    注入sqlSessionTemplate-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

<!--    注入UsrMapperImpl-->
    <bean id="UsrMapperImpl" class="com.zzy.dao.UserMapperImpl">
        <property name="sqlSessionTemplate" ref="sqlSession"/>
    </bean>

</beans>

10.测试文件

import com.zzy.dao.UserMapperImpl;
import com.zzy.pojo.User;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test1 {

    @Test
    public void testMyBatis(){
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("myBatisConfig.xml");
        UserMapperImpl userMapperImpl = context.getBean("UsrMapperImpl", UserMapperImpl.class);
        for (User user : userMapperImpl.findAllUser()) {
            System.out.println(user);

        }
    }
}