mybatis 的 generator，

首先，新建springboot文件，引入pom文件

        <!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
<dependency>
    <groupId>org.mybatis.generator</groupId>
    <artifactId>mybatis-generator-core</artifactId>
    <version>1.4.0</version>
</dependency>

修改，maven_jar的插件版本

<properties>
        <java.version>1.8</java.version>
        <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
    </properties>

第二步，编写java文件

只需要编写test文件，不用主入口文件

package cn.taotao;

import java.io.File;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.junit.jupiter.api.Test;
import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.exception.InvalidConfigurationException;
import org.mybatis.generator.exception.XMLParserException;
import org.mybatis.generator.internal.DefaultShellCallback;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class MybatisGeneratorApplicationTests {

    @Test
    void contextLoads() {
    }

    @Test
    public void MybatisGenerator()  {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("MybatisGenerator.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        try {
            Configuration config = cp.parseConfiguration(configFile);
            DefaultShellCallback callback = new DefaultShellCallback(overwrite);
            MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
            myBatisGenerator.generate(null);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        
        }
    }
}

第三步，编写xml文件，xml文件放到项目根目录，不是类路径。和pom.xml 同级。

<?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="DB2Tables" targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <!-- 配置数据库连接 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
            connectionURL="jdbc:mysql://localhost:3306/test" userId="root"
            password="xxxxxx">
        </jdbcConnection>

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- 指定javaBean生成的位置 -->
        <javaModelGenerator targetPackage="cn.taotao.bean"
            targetProject="C:UsersOwnereclipse-workspaceTransactionDemosrcmainjava">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!--指定sql映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="mapper"
            targetProject="C:UsersOwnereclipse-workspaceTransactionDemosrcmain
esources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!-- 指定dao接口生成的位置，mapper接口 -->
        <javaClientGenerator type="XMLMAPPER"
            targetPackage="cn.taotao.dao" targetProject="C:UsersOwnereclipse-workspaceTransactionDemosrcmainjava">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>


        <!-- table指定每个表的生成策略 -->
        <table tableName="tbl_user" domainObjectName="User"
            enableCountByExample="false" enableDeleteByExample="false"
            enableUpdateByExample="false" enableSelectByExample="false"
            selectByExampleQueryId="false"></table>
        <table tableName="tbl_dept" domainObjectName="Dept"
            enableCountByExample="false" enableDeleteByExample="false"
            enableUpdateByExample="false" enableSelectByExample="false"
            selectByExampleQueryId="false"
        >
        <columnOverride column="deptinfo" javaType="java.lang.String" jdbcType="VARCHAR"></columnOverride>   <!--text类型的，转为varchar类型-->
        </table>
    </context>
</generatorConfiguration>