1、需要的依赖

        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.0.5</version>
        </dependency>

        <!--模板引擎-->
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.0</version>
        </dependency>

        <!--swagger2-->
        <dependency>
            <groupId>io.swagger</groupId>
            <artifactId>swagger-annotations</artifactId>
            <version>1.6.2</version>
        </dependency>

        <!--swagger ui-->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>1.9.6</version>
        </dependency>

2、在测试类中添加一个类用来生成代码

package com.littlenorth;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.config.DataSourceConfig;
import com.baomidou.mybatisplus.generator.config.GlobalConfig;
import com.baomidou.mybatisplus.generator.config.PackageConfig;
import com.baomidou.mybatisplus.generator.config.StrategyConfig;
import com.baomidou.mybatisplus.generator.config.rules.DateType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;

// 代码自动生成器
public class CodeProduct {
    public static void main(String[] args) {
        // 需要构建一个 代码自动生成器 对象
        AutoGenerator mpg = new AutoGenerator();

        // 配置策略
        // 1、全局配置
        GlobalConfig gc = new GlobalConfig();
        //代码生成的路径
        String projectPath = System.getProperty("user.dir");
        gc.setOutputDir(projectPath+"/src/main/java");
        //作者
        gc.setAuthor("love you");
        gc.setOpen(false);
        // 是否覆盖
        gc.setFileOverride(false);
        // 去Service的I前缀
        gc.setServiceName("%sService");

        //ID生成策略
        gc.setIdType(IdType.ID_WORKER);
        //时间生成策略
        gc.setDateType(DateType.ONLY_DATE);
        //开启Swagger2
        gc.setSwagger2(true);
        mpg.setGlobalConfig(gc);


        //2、设置数据源
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8");
        dsc.setDriverName("com.mysql.cj.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("123456");
        //数据库类型
        dsc.setDbType(DbType.MYSQL);
        //设置数据源
        mpg.setDataSource(dsc);

        //3、包的配置
        PackageConfig pc = new PackageConfig();
        pc.setParent("com.littlenorth");
        pc.setEntity("entity");
        pc.setMapper("mapper");
        pc.setService("service");
        pc.setController("controller");
        mpg.setPackageInfo(pc);

        //4、策略配置
        StrategyConfig strategy = new StrategyConfig();
        // 设置要映射的表名
        strategy.setInclude("blog","student","teacher","user");
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
        // 自动lombok；
        strategy.setEntityLombokModel(true);
        strategy.setRestControllerStyle(true);
        strategy.setControllerMappingHyphenStyle(true);
        mpg.setStrategy(strategy);
        //执行
        mpg.execute();
    }
}