• pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xiaohe</groupId>
    <artifactId>flea_market-common-reverse</artifactId>
    <version>1.0-SNAPSHOT</version>
    <!-- 依赖 MyBatis 核心包 -->

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!-- Mysql驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.17</version>
        </dependency>
        <!--数据库连接池 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <!--逆向工程的核心依赖-->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.7</version>
        </dependency>
    </dependencies>

</project>

• MyGennerator运行

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!--    <classPathEntry location="mysql-connector-java-5.1.48-bin.jar"/>-->
    <!--
        defaultModelType=flat（推荐）只为每张表生成一个实体类，这个实体类包含表中的所有字段
        targetRuntime  MyBatis3 ( MyBatis3Simple不会生成与Example相关的方法)-->
    <context id="MySqlTables" targetRuntime="MyBatis3" defaultModelType="flat">
        <!--前后置分隔符-->
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>

        <commentGenerator>
            <!--阻止生成注释，默认为false-->
            <property name="suppressAllComments" value="true"/>
            <!--阻止生成的注释，包含时间戳，默认为false-->
            <property name="suppressDate" value="true"/>
            <!-- 注释是否添加数据库表的备注信息，默认为false-->
            <!--            <property name="addRemarkComments" value="true"/>-->
        </commentGenerator>

        <jdbcConnection
                driverClass="com.mysql.cj.jdbc.Driver"
                connectionURL="jdbc:mysql://localhost:3306/flea_market?serverTimezone=GMT%2B8"
                userId="root"
                password="123456"/>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!--src\main\java-->
        <javaModelGenerator targetPackage="com.xiaohe.entity"
                            targetProject="flea_market-common-reverse\src\main\java">
            <property name="enableSubPackages" value="false"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!-- 映射文件生成的路径 -->
        <sqlMapGenerator targetPackage="com.xiaohe.mapper"
                         targetProject="flea_market-common-reverse\src\main\resources">
            <!--是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!--type="XmlMapper"：所有的方法都在XML中，接口调用依赖XML文件 -->
        <!--type= "ANNOTATEDMAPPER"，则SQL生成在Mapper接口的注解中 annotatedMapper-->
        <!--type= "MixedMapper"，则SQL生成在Mapper接口的注解中-->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.xiaohe.mapper" targetProject="flea_market-common-reverse\src\main\java">
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>

        <!--<table tableName="%customer%">  如果所有的则%-->
        <table tableName="t_admin" domainObjectName="Admin">
        </table>


    </context>
</generatorConfiguration>

• 启动类

public class MyGennerator {
    private String path = "/generatorConfig.xml";//指定配置文件路径
    private boolean overwrite = true; //当生成的代码重复时，覆盖原代码

    public static void main(String[] args) {
        MyGennerator generator = new MyGennerator();
        generator.generateMyBatis();
    }

    // targetRuntime="MyBatis3Simple", 不生成Example
    public void generateMyBatis() {
        //该集合记录MBG执行过程中的警告信息
        List<String> warnings = new ArrayList<String>();
        InputStream is = MyGennerator.class.getResourceAsStream(path);//读取MBG配置文件
        ConfigurationParser cp = new ConfigurationParser(warnings);
        try {
            Configuration config = cp.parseConfiguration(is);
            DefaultShellCallback callback = new DefaultShellCallback(overwrite);
            MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
            myBatisGenerator.generate(null);//执行生成代码
        } catch (Exception e) {
            e.printStackTrace();
        }
        //打印出执行过程中的警告信息，以便于修改
        for (String warning : warnings) {
            System.out.println(warning);
        }
    }
}

成功