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1、导入相关的jar包

<dependencies><!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.0.RELEASE</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.21</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.2</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.0.RELEASE</version></dependency><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.8.13</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.0.2</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.10</version></dependency><build><resources><resource><directory>src/main/resources</directory><includes><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>true</filtering></resource><resource><directory>src/main/java</directory><includes><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>true</filtering></resource></resources></build>
</dependencies>

2、创建一个实体类

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

3、创建一个接口

import java.util.List;public interface UserMapper {List<User> selectUser();
}

4、创建接口的实现类

import org.mybatis.spring.SqlSessionTemplate;import java.util.List;public class UserMapperImpl implements UserMapper{private SqlSessionTemplate sqlSession;public void setSqlSessionTemplate(SqlSessionTemplate sqlSession){this.sqlSession = sqlSession;}public List<User> selectUser() {UserMapper mapper = sqlSession.getMapper(UserMapper.class);return mapper.selectUser();}
}

5、创建一个与接口同名的xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.www.mapper.UserMapper"><select id="selectUser" resultType="User">select * from mybatis.user</select></mapper>

6、创建一个spring-config的xml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"xmlns:context="http://www.springframework.org/schema/context"xmlns:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsd"><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/mybatis?useSSL=false&amp;serverTimezone=UTC&amp;useUnicode=true&amp;characterEncoding=UTF-8"/><property name="username" value="root"/><property name="password" value="123456"/></bean><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource"></property><property name="configLocation" value="classpath:Mybatis-config.xml"></property><property name="mapperLocations" value="classpath:com/www/mapper/*.xml"></property></bean><bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"><constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg></bean></beans>

7、创建一个Mybatis-config.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><typeAliases><package name="com.www.pojo"/></typeAliases></configuration>

8、创建一个applicationContext.xml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"xmlns:context="http://www.springframework.org/schema/context"xmlns:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsd"><import resource="spring-dao.xml"></import><bean id="userMapper2" class="com.www.mapper.UserMapperImpl2"><property name="sqlSessionFactory" ref="sqlSessionFactory"></property></bean><bean id="userMapper" class="com.www.mapper.UserMapperImpl"><property name="sqlSessionTemplate" ref="sqlSession"></property></bean></beans>

9、创建测试类

import com.www.mapper.UserMapper;
import com.www.pojo.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import java.io.IOException;
import java.util.List;public class Test {@org.junit.Testpublic void test() throws IOException {ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");UserMapper mapper = (UserMapper) context.getBean("userMapper");List<User> userList = mapper.selectUser();for (User user:userList) {System.out.println(user);}}
}

10、结果