查看mybatis-plus官网文档中的代码生成器
在复合项目中创建子maven项目
还是一样整理pom文件,添加pom文件所需要的依赖
因本maven只用来做代码生成
所以不需要test文件夹,删除
删除原有App.java,添加generator文件夹

        <!--web 依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--mybatis-plus 依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.2</version>
        </dependency>
        <!--mybatis-plus 代码生成器依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.3.2</version>
        </dependency>
        <!--freemarker 依赖 模板引擎-->
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
        </dependency>
        <!--mysql 依赖-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

创建CodeGenerator类
用来实现mybatis-plus逆向工程

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 + "/yeb-generator/src/main/java");
        //作者
        gc.setAuthor("night");
        //打开输出目录
        gc.setOpen(false);
        //xml 开启BaseResultMap
        gc.setBaseResultMap(true);
        //xml 开启BaseColumnList
        gc.setBaseColumnList(true);
        //实体属性 Swagger2 注解
        gc.setSwagger2(true);

        mpg.setGlobalConfig(gc);

        //数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://localhost:3306/yeb?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true");
        dsc.setDriverName("com.mysql.cj.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("zhujunhua");
        mpg.setDataSource(dsc);

        //包配置
        PackageConfig pc = new PackageConfig();
        pc.setParent("com.night")
                .setEntity("pojo")
                .setMapper("mapper")
                .setService("service")
                .setServiceImpl("service.impl")
                .setController("controller");
        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) {
                return projectPath
                        +"/yeb-generator/src/main/resources/mapper/"
                        +tableInfo.getEntityName()
                        +"Mapper"
                        + StringPool.DOT_XML;
            }
        });
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);

        //配置模板
        TemplateConfig templateConfig = new TemplateConfig();
        templateConfig.setXml(null);
        mpg.setTemplate(templateConfig);

        //策略配置
        StrategyConfig strategy = new StrategyConfig();
        //数据库表映射到实体的命名策略(转换成驼峰命名)
        strategy.setNaming(NamingStrategy.underline_to_camel);
        //数据库表字段映射到实体的命名策略(不用做任何改变)
        strategy.setColumnNaming(NamingStrategy.no_change);
        //lombok模型
        strategy.setEntityLombokModel(true);
        //生成 @RestController 控制器
        strategy.setRestControllerStyle(true);
        strategy.setInclude(scanner("表名,多个英文逗号分割").split(","));
        strategy.setControllerMappingHyphenStyle(true);
        //表前缀
        strategy.setTablePrefix("t_");
        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.execute();
    }
}

启动逆向工程,然后把生成出来的包拷贝到子maven中的server中
在server中添加所需要的依赖

    <!--swagger2 依赖-->
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger2</artifactId>
        <version>2.9.2</version>
    </dependency>
    <!--swagger第三方ui依赖-->
    <dependency>
        <groupId>com.github.xiaoymin</groupId>
        <artifactId>swagger-bootstrap-ui</artifactId>
        <version>1.9.6</version>
    </dependency>

然后修改每个文件的读取路径,没有报错即可