集成的是Freemaker,

1,pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.10.BUILD-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.mangoubiubiu</groupId>
    <artifactId>mybatis_plus_demo_01</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatis_plus_demo_01</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.30</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.3.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--freemarker  这个一定的配-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.0.5</version>
        </dependency>
        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!--lombok用来简化实体类-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!-- 引入第三方数据源 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.6</version>
        </dependency>
        <!--springboot熱部署start-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
            <scope>true</scope>
        </dependency>
        <!--springboot 热部署end-->
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </pluginRepository>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

</project>

1,application.properties

#tomcat端口
server.port=8000
#mysql数据库连接
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/mybatisplus?useUnicode=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=root
#阿里数据源
spring.datasource.type =com.alibaba.druid.pool.DruidDataSource
# freemarker静态资源配置
spring.freemarker.charset=UTF-8
spring.freemarker.suffix=.ftl
spring.freemarker.content-type=text/html; charset=utf-8
spring.freemarker.template-loader-path=classpath:/templates
spring.mvc.static-path-pattern=/static/**

3，CodeGenerator.java

package com.mangoubiubiu;

import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.*;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

// 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 {

    /**
     * <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.isNotEmpty(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 + "/src/main/java");
        gc.setAuthor("mangoubiubiu");
        gc.setOpen(false);
        // 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:mysql://localhost:3306/mybatisplus?useUnicode=true&useSSL=false&characterEncoding=utf8");
        // dsc.setSchemaName("public");
        dsc.setDriverName("com.mysql.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("root");
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setModuleName(scanner("模块名"));
        pc.setParent("com");
        mpg.setPackageInfo(pc);

        // 自定义配置
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {
                // to do nothing
            }
        };

        // 如果模板引擎是 freemarker
        String templatePath = "/templates/mapper.xml.ftl";
        // 如果模板引擎是 velocity
        // String templatePath = "/templates/mapper.xml.vm";

        // 自定义输出配置
        List<FileOutConfig> focList = new ArrayList<>();
        // 自定义配置会被优先输出
        focList.add(new FileOutConfig(templatePath) {
            @Override
            public String outputFile(TableInfo tableInfo) {
                // 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
                return projectPath + "/src/main/resources/mapper/" + pc.getModuleName()
                        + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        /*
        cfg.setFileCreate(new IFileCreate() {
            @Override
            public boolean isCreate(ConfigBuilder configBuilder, FileType fileType, String filePath) {
                // 判断自定义文件夹是否需要创建
                checkDir("调用默认方法创建的目录，自定义目录用");
                if (fileType == FileType.MAPPER) {
                    // 已经生成 mapper 文件判断存在，不想重新生成返回 false
                    return !new File(filePath).exists();
                }
                // 允许生成模板文件
                return true;
            }
        });
        */
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);

        // 配置模板
        TemplateConfig templateConfig = new TemplateConfig();

        // 配置自定义输出模板
        //指定自定义模板路径，注意不要带上.ftl/.vm, 会根据使用的模板引擎自动识别
        // templateConfig.setEntity("templates/entity2.java");
        // templateConfig.setService();
        // templateConfig.setController();

        templateConfig.setXml(null);
        mpg.setTemplate(templateConfig);

        // 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() + "_");
        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.execute();
    }

}

4,未生成前目录结构

 

 5，点击运行 控制台打印如下

请输入模块名：
mangoubiubiu
请输入表名，多个英文逗号分割：
user
20:17:50.384 [main] DEBUG com.baomidou.mybatisplus.generator.AutoGenerator - ==========================准备生成文件...==========================
20:17:51.089 [main] DEBUG com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine - 创建目录： [F:\idea_workspace\mybatis_plus_demo_01/src/main/java\com\mangoubiubiu\entity]
20:17:51.090 [main] DEBUG com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine - 创建目录： [F:\idea_workspace\mybatis_plus_demo_01/src/main/java\com\mangoubiubiu\controller]
20:17:51.090 [main] DEBUG com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine - 创建目录： [F:\idea_workspace\mybatis_plus_demo_01/src/main/java\com\mangoubiubiu\mapper]
20:17:51.091 [main] DEBUG com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine - 创建目录： [F:\idea_workspace\mybatis_plus_demo_01/src/main/java\com\mangoubiubiu\service\impl]
20:17:51.187 [main] DEBUG com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine - 模板:/templates/mapper.xml.ftl;  文件:F:\idea_workspace\mybatis_plus_demo_01/src/main/resources/mapper/mangoubiubiu/UserMapper.xml
20:17:51.322 [main] DEBUG com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine - 模板:/templates/entity.java.ftl;  文件:F:\idea_workspace\mybatis_plus_demo_01/src/main/java\com\mangoubiubiu\entity\User.java
20:17:51.326 [main] DEBUG com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine - 模板:/templates/mapper.java.ftl;  文件:F:\idea_workspace\mybatis_plus_demo_01/src/main/java\com\mangoubiubiu\mapper\UserMapper.java
20:17:51.330 [main] DEBUG com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine - 模板:/templates/service.java.ftl;  文件:F:\idea_workspace\mybatis_plus_demo_01/src/main/java\com\mangoubiubiu\service\IUserService.java
20:17:51.334 [main] DEBUG com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine - 模板:/templates/serviceImpl.java.ftl;  文件:F:\idea_workspace\mybatis_plus_demo_01/src/main/java\com\mangoubiubiu\service\impl\UserServiceImpl.java
20:17:51.339 [main] DEBUG com.baomidou.mybatisplus.generator.engine.AbstractTemplateEngine - 模板:/templates/controller.java.ftl;  文件:F:\idea_workspace\mybatis_plus_demo_01/src/main/java\com\mangoubiubiu\controller\UserController.java
20:17:51.339 [main] DEBUG com.baomidou.mybatisplus.generator.AutoGenerator - ==========================文件生成完成！！！==========================

Process finished with exit code 0

6，生成后目录

 

 7，官方文档

https://baomidou.com/guide/generator.html

8，总结：非常强大，如果你配置了lombok 在生成实体类时，会自动给你加注解，没有配会自动生成get set 方法 ，总之非常强大。