1.在Mybatis的pom.xml文件中添加依赖

       <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.11</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.17</version>
        </dependency>

2.全局配置文件（mybatis-config.xml）（src/main/resources）

<?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>

    <!-- 环境，可以配置多个，default：指定采用哪个环境 -->
    <environments default="dev">

        <!-- id：唯一标识 -->
        <environment id="dev">
            <!--采用JDBC进行事务的管理commit/rollback-->
            <transactionManager type="JDBC"/>
            <!-- 数据源，连接池类型的数据源 -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url"
                          value="jdbc:mysql://localhost:3306/babytun?useUnicode=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC"/>
                <property name="username" value="root"/>
                <property name="password" value="197366"/>
            </dataSource>
        </environment>

    </environments>

</configuration>