依赖

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-generator</artifactId>
    <version>3.3.2</version>
</dependency>
<dependency>
    <groupId>org.apache.velocity</groupId>
    <artifactId>velocity-engine-core</artifactId>
    <version>2.2</version>
</dependency>

生成器Demo

// 演示例子，执行 main 方法控制台输入模块表名回车自动生成对应项目目录中
public class CodeGenerator {

    private static String OUTPUT_DIR = "D:\\idea-workspace\\Learning\\mybatis-plus\\src\\main\\java";
    private static String JDBC_URL = "jdbc:mysql://数据库IP地址:3306/数据库名";
    private static String USERNAME = "数据库账号";
    private static String PASSWORD = "数据库密码";
    private static String TABLE_PREFIX = "表前缀_";

    /**
     * <p>
     * 读取控制台内容
     * </p>
     */
    public static String scanner(String tip) {
        Scanner scanner = new Scanner(System.in);
        StringBuilder help = new StringBuilder();
        help.append("请输入" + tip + "：");
        System.out.println(help.toString());
        if (scanner.hasNext()) {
            String ipt = scanner.next();
            if (StringUtils.isNotBlank(ipt)) {
                return ipt;
            }
        }
        throw new MybatisPlusException("请输入正确的" + tip + "！");
    }

    public static void main(String[] args) {
        // 代码生成器
        AutoGenerator mpg = new AutoGenerator();

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
//        String projectPath = System.getProperty("user.dir");
//        gc.setOutputDir(projectPath +"/"+scanner("项目名")+ "/src/main/java");
        gc.setOutputDir(OUTPUT_DIR);
        gc.setAuthor("梦叶");
        gc.setOpen(false);
        gc.setFileOverride(false); //重新生成时文件是否覆盖
        gc.setServiceName("%sService");    //去掉Service接口的首字母I
        gc.setIdType(IdType.ID_WORKER_STR); //主键策略
        gc.setDateType(DateType.ONLY_DATE);//定义生成的实体类中日期类型
         gc.setSwagger2(true); //实体属性 Swagger2 注解
        mpg.setGlobalConfig(gc);


        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl(JDBC_URL+"?useUnicode=true&useSSL=false&characterEncoding=utf8");
        // dsc.setSchemaName("public");
        dsc.setDriverName("com.mysql.jdbc.Driver");
        dsc.setUsername(USERNAME);
        dsc.setPassword(PASSWORD);
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setParent(scanner("父包名(域名)"));
        pc.setModuleName(scanner("模块名(域名后的子包名)"));
        pc.setController("controller");
        pc.setEntity("po");
        pc.setService("service");
        pc.setMapper("mapper");
        mpg.setPackageInfo(pc);

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
//        strategy.setSuperEntityClass("你自己的父类实体,没有就不用设置!");
        strategy.setEntityLombokModel(true);
        strategy.setRestControllerStyle(true);
        // 公共父类
//        strategy.setSuperControllerClass("你自己的父类控制器,没有就不用设置!");
        // 写于父类中的公共字段
        //strategy.setSuperEntityColumns("id");
        strategy.setInclude(scanner("表名，多个英文逗号分割").split(","));
        strategy.setControllerMappingHyphenStyle(true);
//        strategy.setTablePrefix(pc.getModuleName() + "_");
        strategy.setTablePrefix(TABLE_PREFIX);
        mpg.setStrategy(strategy);
//        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.execute();
    }

}