继承mybatis-generator的maven插件，生成entity、dao、mapper.xml。
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1. resource文件夹下创建一个xml文件，名字任意，后续pom中可设置指定， 创建文件 mybatis-generator-config.xml

<!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="originCtx" targetRuntime="MyBatis3">
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/test?useSSL=false&amp;useUnicode=true&amp;characterEncoding=UTF8&amp;serverTimezone=GMT"
                        userId="root" password="123456"/>

        <!-- 非必须，类型处理器，在数据库类型和java类型之间的转换控制 -->
        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- Entity Java Class -->
        <javaModelGenerator targetPackage="com.orion.entity" targetProject="./src/main/java">
            <property name="enableSubPackages" value="false" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!-- Mapper XML File -->
        <sqlMapGenerator targetPackage="mapper"  targetProject="./src/main/resources">
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>

        <!-- Mapper Java Class -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.orion.mapper"  targetProject="./src/main/java">
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>

        <!-- 需要生成的数据库表 -->
        <table schema="test" tableName="t_account" domainObjectName="TAccount" enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
        </table>
        <table schema="test" tableName="t_score" domainObjectName="TScore" enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
        </table>
    </context>
</generatorConfiguration>

2. pom依赖

可见plugin中指定config文件位置

<?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.orion</groupId>
    <artifactId>MybatisOrigin</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
            <version>8.0.30</version>
        </dependency>

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

    </dependencies>

    <build>
        <finalName>mybatis-origin</finalName>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.4.1</version>
                <configuration>
                    <overwrite>true</overwrite>
                    <configurationFile>${basedir}/src/main/resources/mybatis-generator-config.xml</configurationFile>
                </configuration>
                <!-- 必须加上 -->
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.30</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>

3. idea双击generator插件