1.在pom中引入通用mapper工具

<!-- 通用mapper逆向工具 -->
<dependency>
    <groupId>tk.mybatis</groupId>
    <artifactId>mapper-spring-boot-starter</artifactId>
    <version>2.1.5</version>
</dependency>

2.在yml中引入通用mapper配置

############################################################
#
# mybatis mapper 配置
#
############################################################
# 通用 Mapper 配置
mapper:
  mappers: com.demo.mapper.MyMapper
  not-empty: false
  identity: MYSQL

3.引入MyMapper接口类

package com.honor.one.my.mapper;

import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

/**
 * 继承自己的MyMapper
 */
public interface MyMapper<T> extends Mapper<T>, MySqlMapper<T> {
}

4.在根目录创建generatorConfig.xml

<?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>
    <context id="MysqlContext" targetRuntime="MyBatis3Simple" defaultModelType="flat">
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>

        <!-- 通用mapper所在目录 -->
        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">
            <property name="mappers" value="com.demo.my.mapper.MyMapper"/>
        </plugin>

        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3309/testdb"
                        userId="root"
                        password="ROOT123">
        </jdbcConnection>

        <!-- 对应生成的pojo所在包 -->
        <javaModelGenerator targetPackage="com.demo.pojo" targetProject="src/main/java"/>

        <!-- 对应生成的mapper所在目录 -->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"/>

        <!-- 配置mapper对应的java映射 -->
        <javaClientGenerator targetPackage="com.demo.mapper" targetProject="src/main/java" type="XMLMAPPER"/>

        <!-- 数据库表 -->
        <table tableName="stu"></table>

    </context>
</generatorConfiguration>

5.创建启动类

package com.honor.one.mybatis.utils;
import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
public class GeneratorDisplay {

public void generator() throws Exception {

    List<String> warnings = new ArrayList<String>();
    //指定 逆向工程配置文件
    File configFile = new File("generatorConfig.xml");
    ConfigurationParser cp = new ConfigurationParser(warnings);
    Configuration config = cp.parseConfiguration(configFile);
    DefaultShellCallback callback = new DefaultShellCallback(true);
    MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,callback, warnings);      
    myBatisGenerator.generate(null);
    } 
    public static void main(String[] args) throws Exception {
        try {
        GeneratorDisplay generatorSqlmap = new GeneratorDisplay();
        generatorSqlmap.generator();
        } catch (Exception e) {
        e.printStackTrace();
        }
        }
        }

6.目录结构如下

7.运行启动类后生成对应文件

8.将对应文件拷贝进自己的项目即可