一、简易生成代码

/**
 * 代码生成器
 * @since 2022-03-21
 */
public class MpCode {
    public static void main(String[] args) {
        generate();
    }
    private  static  void generate(){
        FastAutoGenerator.create("jdbc:mysql://127.0.0.1:3306/life-sign?serverTimezone=UTC", "root", "root")
                .globalConfig(builder -> {
                    builder.author("lh") // 设置作者
                            /*.enableSwagger() */// 开启 swagger 模式
                            .fileOverride() // 覆盖已生成文件
                            .outputDir("E:\\IDEA_MY\\life-sign\\sign-common\\sign-code\\src\\main\\java"); // 指定输出目录  和自己项目src一一对应
                })
                .packageConfig(builder -> {
                    builder.parent("com.luck.sign") // 设置父包名
                            .moduleName(null) // 设置父包模块名  解决路径冲突
                            .serviceImpl("service.impl") //自定义包名imp 官方的是impi
                            .entity("entity") //设置实体包为pojo
                            .pathInfo(Collections.singletonMap(OutputFile.mapperXml, "E:\\IDEA_MY\\life-sign\\sign-common\\sign-code\\src\\main\\resources\\mapper")); // 设置mapperXml生成路径
                })
                .strategyConfig(builder -> {
                    builder.entityBuilder().enableLombok();//使用lombok
                    builder.controllerBuilder().enableHyphenStyle()
                            .enableRestStyle();//开启RestController
                    builder.addInclude("sign_tag"); // 设置需要生成的表名

                })
//                  .templateEngine(new VelocityTemplateEngine()) // 使用Freemarker引擎模板，默认的是Velocity引擎模板
                .execute();
    }
}

二、指定生成的样式，并且不在一个模块

1.父pom文件配置

我是在父pom文件里进行的依赖管理

<?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.luck</groupId>
    <artifactId>life-sign</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>sign-auth</module>
        <module>sign-common</module>
        <module>sign-work</module>
    </modules>

    <!--    打包方式 pom-->
    <packaging>pom</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencyManagement>
        <dependencies>
            <!--swagger本身不支持spring mvc的，springfox把swagger包装了一下，让他可以支持springmvc-->
            <!-- swagger-ui -->
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger-ui</artifactId>
                <version>2.9.2</version>
            </dependency>

            <!-- swagger2 -->
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger2</artifactId>
                <version>2.9.2</version>
            </dependency>

            <!--spring cloud Hoxton.SR1-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!--spring boot 2.2.2-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.2.2.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.27</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>2.1.4</version>
            </dependency>
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>3.4.1</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.23</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.13</version>
                <scope>test</scope>
            </dependency>
            <!--      lombok 包含了lombok.extern.slf4j.Slf4j -->
            <!--      https://blog.csdn.net/xiaozhuangyumaotao/article/details/106009846-->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.22</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

</project>

2.子模块pom文件配置

父模块管理了依赖，对于父模块里面有的，子模块导入，就不需要写版本号了

<?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">
    <parent>
        <artifactId>sign-common</artifactId>
        <groupId>com.luck</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <packaging>jar</packaging>
    <artifactId>sign-code</artifactId>
    <dependencies>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
        </dependency>

        <!-- mybatis plus 代码生成器引擎依赖-->
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity</artifactId>
            <version>1.7</version>
        </dependency>
        <!-- mybatis plus 代码生成器依赖 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

</project>

以上模块的导入，针对mybatis-plus自动生成代码的功能，主要如下几个依赖

        <!-- mybatis plus 代码生成器引擎依赖-->
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity</artifactId>
            <version>1.7</version>
        </dependency>
        <!-- mybatis plus 代码生成器依赖 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
        </dependency>

3.准备vm文件

资源链接如下，若下载不了，可留言
mybatis-plus自动生成代码的自定义引擎文件（vm文件）

4.设置MyBatisPlusGenerator.java

用心看，铁子们应该看的懂

package com.luck.sign.util;


import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
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.DateType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.VelocityTemplateEngine;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.WordUtils;

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

/**
 * mybatis plus 代码自动生成器
 * 参考： https://blog.csdn.net/ChunwaiLeung/article/details/121629340
 */
public class MyBatisPlusGenerator {
    private static String module;
    private static String PACKAGE = "com.luck.sign";
    private static String AUTHOR = "lh";
    private static String DATA_USER_NAME = "root";
    private static String DATA_PASSWORD = "root";
    private static String DATA_DRIVER_NAME = "com.mysql.cj.jdbc.Driver";
    private static String DATA_URL = "jdbc:mysql://127.0.0.1:3306/life-sign?characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&allowMultiQueries=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai";
    private static String PATH_MAPPER  = "/src/main/java/com/luck/sign/";
    private static String PATH_MAPPER_XML = "/src/main/resources/mapper/";
    private static String PATH_CONTROLLER = "/src/main/java/com/luck/sign/";
    private static String PATH_SERVICE = "/src/main/java/com/luck/sign/";
    private static String PATH_SERVICE_IMP = "/src/main/java/com/luck/sign/";
    private static String PATH_ENTITY = "/sign-common/sign-code/src/main/java/com/luck/sign/";


    public static void main(String[] args) {
        module = "/" + scanner("要输入到哪个项目？");
        String[] tables = scanner("请输入要生成的表名多个用 , 分割").split(",");
        for (String table : tables) {
            shell(table);
        }
    }
    public static String scanner(String someThing) {
        Scanner scanner = new Scanner(System.in);
        StringBuilder help = new StringBuilder();
        help.append("请输入" + someThing + "：");
        System.out.println(help.toString());
        if (scanner.hasNext()) {
            String sc = scanner.next();
            if ("" != sc && null != sc) {
                return sc;
            }
        }
        throw new MybatisPlusException("请输入正确的" + someThing + "！");
    }

    private static void shell(String table) {
        // 代码生成器
        AutoGenerator mpg = new AutoGenerator();

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setDriverName(DATA_DRIVER_NAME);
        dsc.setUsername(DATA_USER_NAME);
        dsc.setPassword(DATA_PASSWORD);
        dsc.setUrl(DATA_URL);
        mpg.setDataSource(dsc);

        // 全局配置
        final String projectPath = System.getProperty("user.dir"); // 默认定位到的当前用户目录("user.dir")（即工程根目录） https://blog.csdn.net/qq_29964641/article/details/86686585
        GlobalConfig gc = new GlobalConfig();
        gc.setAuthor(AUTHOR);//作者名称
        gc.setDateType(DateType.ONLY_DATE);
        gc.setOpen(false); //生成后是否打开资源管理器
        gc.setServiceName("%sService"); //自定义文件命名，注意 %s 会自动填充表实体属性！ %s作为占位符
        gc.setServiceImplName("%sServiceImpl");
        gc.setMapperName("%sMapper");
        gc.setXmlName("%sMapper");
        gc.setSwagger2(true);// 是否开启Swagger2模式
        gc.setFileOverride(true); //重新生成时文件是否覆盖
        gc.setActiveRecord(false);// 不需要ActiveRecord特性的请改为false
        gc.setEnableCache(false);// XML 二级缓存
        gc.setBaseResultMap(true);// XML ResultMap
        gc.setBaseColumnList(false);// XML columList
//        gc.setIdType(IdType.ID_WORKER_STR); //主键策略
//        gc.setOutputDir(projectPath + "/src/main/java");
//        gc.setControllerName("%sController");
        mpg.setGlobalConfig(gc);


        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setParent(PACKAGE);
        pc.setMapper("mapper");//dao
        pc.setService("service");//servcie
        pc.setController("controller");//controller
        pc.setEntity("entity");
//        pc.setModuleName("model名"); 自定义包名

        // 自定义配置
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {
//                //表信息
                String name = this.getConfig().getStrategyConfig().getColumnNaming().name();
            }
        };

        // 模板引擎是 freemarker
        // 自定义controller的代码模板
        // 如果模板引擎是 velocity
        String templatePath = "/template/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,配置mapper.xml
        focList.add(new FileOutConfig(templatePath) {
            @Override
            public String outputFile(TableInfo tableInfo) {
                //根据自己的位置修改
                return projectPath  + module + PATH_MAPPER_XML + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });

        //控制层
        templatePath = "/template/Controller.java.vm";
        // 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 + pc.getModuleName()
                String expand = projectPath  + module + PATH_CONTROLLER + "controller";
                String entityFile = String.format((expand + File.separator + "%s" + ".java"), tableInfo.getControllerName());
                return entityFile;
            }
        });

        //业务层
        templatePath = "/template/Service.java.vm";
        // 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 + pc.getModuleName()
                String expand = projectPath  + module + PATH_SERVICE + "service";
                String entityFile = String.format((expand + File.separator + "%s" + ".java"), tableInfo.getServiceName());
                return entityFile;
            }
        });
        templatePath = "/template/ServiceImpl.java.vm";
        // 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 + pc.getModuleName()
                String expand = projectPath  + module + PATH_SERVICE_IMP + "service/impl";
                String entityFile = String.format((expand + File.separator + "%s" + ".java"), tableInfo.getServiceImplName());
                return entityFile;
            }
        });

        //数据层
        templatePath = "/template/Mapper.java.vm";
        // 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 + pc.getModuleName()
                String expand = projectPath + module +PATH_MAPPER + "mapper";
                String entityFile = String.format((expand + File.separator + "%s" + ".java"), tableInfo.getMapperName());
                return entityFile;
            }
        });

        //数据层
        templatePath = "/template/Entity.java.vm";
        // 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 + pc.getModuleName()
                String expand = projectPath + PATH_ENTITY + "entity";
                String entityFile = String.format((expand + File.separator + "%s" + ".java"), tableInfo.getEntityName());
                return entityFile;
            }
        });
        mpg.setPackageInfo(pc);
        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.setService("/template/Service.java.vm");
        templateConfig.setServiceImpl("/template/ServiceImpl.java.vm");
        templateConfig.setEntity("/template/Entity.java.vm");
        templateConfig.setMapper("/template/Mapper.java.vm");
        templateConfig.setController("/template/Controller.java.vm");
        //        //此处设置为null，就不会再java下创建xml的文件夹了
        templateConfig.setXml("/template/Mapper.xml.vm");
        mpg.setTemplate(templateConfig);


        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel); // 数据库表映射到实体的命名策略
        strategy.setColumnNaming(NamingStrategy.underline_to_camel); //数据库表字段映射到实体的命名策略
        strategy.setEntityLombokModel(true);
        strategy.setRestControllerStyle(true);
        strategy.setInclude(table); //table 表名对那一张表生成代码
        strategy.setControllerMappingHyphenStyle(true);
        strategy.setEntityLombokModel(true); // lombok 模型 @Accessors(chain = true) setter链式操作
//        strategy.setSuperEntityClass("com.baomidou.ant.common.BaseEntity");
//        strategy.setSuperControllerClass("com.baomidou.ant.common.BaseController"); // 公共父类
//        strategy.setSuperEntityColumns("id"); //         写于父类中的公共字段
//        strategy.setTablePrefix("t_");  //生成实体时去掉表前缀
//        strategy.setRestControllerStyle(true); //restful api风格控制器
//        strategy.setControllerMappingHyphenStyle(true); //url中驼峰转连字符

        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new VelocityTemplateEngine());//默认模板引擎
        mpg.execute();

    }

    /**
     * 表名转换成Java类名
     */
    private String tableToJava(String tableName, String tablePrefix) {
        if (StringUtils.isNotBlank(tablePrefix)) {
            tableName = tableName.replaceFirst(tablePrefix, "");
        }
        return columnToJava(tableName);
    }

    /**
     * 列名转换成Java属性名
     */
    public String columnToJava(String columnName) {
        return WordUtils.capitalizeFully(columnName, new char[]{'_'}).replace("_", "");
    }
}

5.运行MyBatisPlusGenerator.java文件

6.运行sign-auth模块,解决异常

问题：
因为在MyBatisPlusGenerator.java 的全局参数配置重开启了swagger,但是模块并没有引入相关依赖

解决：
1.因为其他模块都会引入sign-code模块，所以在sign-code模块里引入
2.配置swagger.config,否则swagger不能正常访问

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
        </dependency>

报错：
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'signOpenidController' defined in file [E:\IDEA_MY\life-sign\sign-auth\target\classes\com\luck\sign\controller\SignOpenidController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'signOpenidServiceImpl': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.luck.sign.mapper.SignOpenidMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:798) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE]
	... ...
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'signOpenidServiceImpl': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.luck.sign.mapper.SignOpenidMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE]
	... ...
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.luck.sign.mapper.SignOpenidMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1695) ~[spring-beans-5.2.2.RELEASE.jar:5.2.2.RELEASE]
	... ...

解决方式：
在启动类加注释 @MapperScan("com.luck.sign.mapper")，再运行即可

@MapperScan("com.luck.sign.mapper")
@SpringBootApplication
public class AuthApplication {
    public static void main(String[] args){
        SpringApplication.run(AuthApplication.class,args);
    }
}