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#mybatis-plus自动生成代码

#mybatis-plus自动生成代码

作者: 努力耕耘少问收获 | 来源:发表于2020-09-25 10:08 被阅读0次

    一、介绍

    本教程将介绍如何使用 mybatis-plus 工具自动给我们生成 Controller、Service、Entity、Mapper、Mapper.xml 层代码

    要求:

    ① 生成的Mapper接口,需要继承 BaseMapper

    ② 生成的Entity 类,需要继承 Model

    ③ 生成的 Service,默认名称下是以 I 开头的接口, 在生成Service层代码中需要把这个 I 去掉

    二、实现步骤

    ① 在数据库中创建好 数据库 与 要生成代码对应的表

    这里拿 sys_dict 表举例

    /*==============================================================*/
    /* DBMS name:      MySQL 5.0                                    */
    /* Created on:     2020/9/25 9:34:58                            */
    /*==============================================================*/
    
    
    drop table if exists sys_dict;
    /*==============================================================*/
    /* Table: sys_dict                                              */
    /*==============================================================*/
    create table sys_dict
    (
       id                   int not null auto_increment comment '主键',
       name                 varchar(50) comment '名称',
       parent_id            int comment '父级ID',
       sort                 int comment '排序',
       type                 int comment '类型',
       create_by            int comment '创建人',
       create_date          datetime comment '创建时间',
       primary key (id)
    );
    
    alter table sys_dict comment '数据字典';
    

    ② 创建 一个SpringBoot 项目,其中 pom.xml 内容如下:

    <?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>2.3.3.RELEASE</version>
            <relativePath/> <!-- lookup parent from repository -->
        </parent>
        <groupId>com.hytc.mall</groupId>
        <artifactId>hytcmall</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>hytcmall</name>
        <description>弘毅天承商城</description>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <!-- 动态数据源 -->
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
                <version>2.5.4</version>
            </dependency>
    
            <!-- mybatisPlus -->
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>3.1.2</version>
            </dependency>
    
            <!-- mybatis MVC -->
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus</artifactId>
                <version>3.3.2</version>
            </dependency>
    
            <!-- mybatisPlus 代码生成-->
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-generator</artifactId>
                <version>3.3.2</version>
            </dependency>
    
            <!--执行main方法前请注意,在生成文件的时候需要有一个模板引擎的选择,MyBatis Plus的默认模板引擎是velocity。我们可以使用freemarker-->
            <dependency>
                <groupId>org.freemarker</groupId>
                <artifactId>freemarker</artifactId>
            </dependency>
    
            <!--数据库链接    -->
            <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.19</version>
            </dependency>
    
            <!-- 非关系型数据库Redis -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-redis</artifactId>
            </dependency>
    
            <!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
            <dependency>
                <groupId>redis.clients</groupId>
                <artifactId>jedis</artifactId>
                <version>3.2.0</version>
            </dependency>
    
            <!-- 阿里巴巴连接池 -->
            <!-- https://mvnrepository.com/artifact/com.alibaba/druid-spring-boot-starter -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid-spring-boot-starter</artifactId>
                <version>1.1.22</version>
            </dependency>
            <!-- 阿里巴巴fastjson序列化 -->
            <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.58</version>
            </dependency>
    
    
            <!-- JWT -->
            <!-- https://mvnrepository.com/artifact/com.auth0/java-jwt -->
            <dependency>
                <groupId>com.auth0</groupId>
                <artifactId>java-jwt</artifactId>
                <version>3.10.2</version>
            </dependency>
    
            <!-- 常用工具类 -->
            <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>3.10</version>
            </dependency>
    
            <!-- https://mvnrepository.com/artifact/cn.hutool/hutool-all -->
            <dependency>
                <groupId>cn.hutool</groupId>
                <artifactId>hutool-all</artifactId>
                <version>5.3.0</version>
            </dependency>
    
            <!--工具类-->
            <dependency>
                <groupId>com.xiaoleilu</groupId>
                <artifactId>hutool-all</artifactId>
                <version>3.3.0</version>
            </dependency>
    
            <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.8</version>
                <scope>provided</scope>
            </dependency>
    
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>1.2.17</version>
            </dependency>
    
            <!-- swagger2 -->
            <!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger2 -->
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger2</artifactId>
                <version>2.9.2</version>
            </dependency>
            <!--防止进入swagger页面报类型转换错误,排除2.9.2中的引用,手动增加1.5.21版本-->
            <dependency>
                <groupId>io.swagger</groupId>
                <artifactId>swagger-annotations</artifactId>
                <version>1.5.21</version>
            </dependency>
    
            <dependency>
                <groupId>io.swagger</groupId>
                <artifactId>swagger-models</artifactId>
                <version>1.5.21</version>
            </dependency>
    
    
            <!-- 这里使用 swagger-bootstrap-ui 替代了原有丑陋的ui,拯救处女座~ -->
            <!-- https://mvnrepository.com/artifact/com.github.xiaoymin/swagger-bootstrap-ui -->
            <dependency>
                <groupId>com.github.xiaoymin</groupId>
                <artifactId>swagger-bootstrap-ui</artifactId>
                <version>1.9.6</version>
            </dependency>
    
    
            <dependency>
                <groupId>org.apache.poi</groupId>
                <artifactId>poi</artifactId>
                <version>3.9</version>
            </dependency>
    
            <dependency>
                <groupId>org.apache.poi</groupId>
                <artifactId>poi-ooxml</artifactId>
                <version>3.7</version>
            </dependency>
    
            <dependency>
                <groupId>org.apache.poi</groupId>
                <artifactId>poi-ooxml-schemas</artifactId>
                <version>3.9</version>
            </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>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>
    
    

    ③ 创建代码生成类

    package com.hytc.mall.hytcmall.generator;
    
    import com.baomidou.mybatisplus.annotation.DbType;
    import com.baomidou.mybatisplus.generator.AutoGenerator;
    import com.baomidou.mybatisplus.generator.InjectionConfig;
    import com.baomidou.mybatisplus.generator.config.*;
    import com.baomidou.mybatisplus.generator.config.converts.MySqlTypeConvert;
    import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
    import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    /**
     * @ClassName: MysqlGenerator
     * @Description:https://blog.csdn.net/u010559460/article/details/103945985/
     * https://www.cnblogs.com/wyrlzy/p/12033912.html
     * @Author: BYP <502955177@qq.com>
     * @Date: 2020/9/24 14:36
     * @Copyright: 2019 www.tydic.com Inc. All rights reserved.
     * 注意:本内容仅限于弘毅天承信息技术股份有限公司内部传阅,禁止外泄以及用于其他的商业目
     */
    public class MysqlGenerator {
    
        final static String  dirPath = "E://HYTC//project//mall//font//src//main//java";
    
        /**
         * <p>
         * MySQL 生成演示
         * </p>
         */
        public static void main(String[] args) {
            AutoGenerator mpg = new AutoGenerator();
            // 选择 freemarker 引擎,默认 Veloctiy
            mpg.setTemplateEngine(new FreemarkerTemplateEngine());
    
            // 全局配置
            GlobalConfig gc = new GlobalConfig();
            gc.setOutputDir(dirPath);
            gc.setAuthor("baiYP");
            gc.setFileOverride(true); //是否覆盖
            gc.setActiveRecord(true);// 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(true);// XML columList
    
            // 自定义文件命名,注意 %s 会自动填充表实体属性!
            // gc.setMapperName("%sDao");
            // gc.setXmlName("%sMapper");
            // gc.setServiceName("MP%sService");
            // gc.setServiceImplName("%sServiceDiy");
            // gc.setControllerName("%sAction");
            mpg.setGlobalConfig(gc);
    
            // 数据源配置
            DataSourceConfig dsc = new DataSourceConfig();
            dsc.setDbType(DbType.MYSQL);
            dsc.setTypeConvert(new MySqlTypeConvert(){
                // 自定义数据库表字段类型转换【可选】
    //            public DbColumnType processTypeConvert(String fieldType) {
    //                System.out.println("转换类型:" + fieldType);
    //                // 注意!!processTypeConvert 存在默认类型转换,如果不是你要的效果请自定义返回、非如下直接返回。
    //                return super.processTypeConvert(fieldType);
    //            }
            });
            dsc.setDriverName("com.mysql.cj.jdbc.Driver");
            dsc.setUsername("root");
            dsc.setPassword("root");
            dsc.setUrl("jdbc:mysql://localhost:3306/hytcmall_20200923?serverTimezone=UTC&characterEncoding=utf8&useUnicode=true&useSSL=false");
            mpg.setDataSource(dsc);
    
            // 策略配置
            StrategyConfig strategy = new StrategyConfig();
            // strategy.setCapitalMode(true);// 全局大写命名 ORACLE 注意
    
    
            //strategy.setTablePrefix(new String[] { "tb_", "sys_" });// 此处可以修改为您的表前缀
    
    
            strategy.setNaming(NamingStrategy.underline_to_camel);// 表名生成策略
            // strategy.setInclude(new String[] { "user" }); // 需要生成的表
             strategy.setExclude(new String[]{"sys_dict","tb_goods"}); // 排除生成的表
            // 自定义实体父类
            // strategy.setSuperEntityClass("com.baomidou.demo.TestEntity");
            // 自定义实体,公共字段
            // strategy.setSuperEntityColumns(new String[] { "test_id", "age" });
            // 自定义 mapper 父类
            // strategy.setSuperMapperClass("com.baomidou.demo.TestMapper");
            // 自定义 service 父类
            // strategy.setSuperServiceClass("com.baomidou.demo.TestService");
            // 自定义 service 实现类父类
            // strategy.setSuperServiceImplClass("com.baomidou.demo.TestServiceImpl");
            // 自定义 controller 父类
            // strategy.setSuperControllerClass("com.baomidou.demo.TestController");
            // 【实体】是否生成字段常量(默认 false)
            // public static final String ID = "test_id";
            // strategy.setEntityColumnConstant(true);
            // 【实体】是否为构建者模型(默认 false)
            // public User setName(String name) {this.name = name; return this;}
            strategy.setEntityBuilderModel(true);
            mpg.setStrategy(strategy);
    
            // 包配置
            PackageConfig pc = new PackageConfig();
            pc.setParent("com.hytc.mall.hytcmall");
            //pc.setModuleName("good");
            pc.setController("controller");
            pc.setEntity("entity");
            pc.setMapper("mapper");
            pc.setService("service");
            pc.setServiceImpl("service.mpl");
            pc.setXml("xml");
    
            mpg.setPackageInfo(pc);
    
            // 注入自定义配置,可以在 VM 中使用 cfg.abc 【可无】
            InjectionConfig cfg = new InjectionConfig() {
                @Override
                public void initMap() {
                    Map<String, Object> map = new HashMap<String, Object>();
                    map.put("abc", this.getConfig().getGlobalConfig().getAuthor() + "-mp");
                    this.setMap(map);
                }
            };
    
            // 自定义 xxList.jsp 生成
            List<FileOutConfig> focList = new ArrayList<FileOutConfig>();
    /*        focList.add(new FileOutConfig("/template/list.jsp.vm") {
                @Override
                public String outputFile(TableInfo tableInfo) {
                    // 自定义输入文件名称
                    return "D://my_" + tableInfo.getEntityName() + ".jsp";
                }
            });
            cfg.setFileOutConfigList(focList);
            mpg.setCfg(cfg);*/
    
            // 调整 xml 生成目录演示
    /*        focList.add(new FileOutConfig("/templates/mapper.xml.vm") {
                @Override
                public String outputFile(TableInfo tableInfo) {
                    return dirPath + tableInfo.getEntityName() + "Mapper.xml";
                }
            });
            cfg.setFileOutConfigList(focList);
            */
            mpg.setCfg(cfg);
    
            // 关闭默认 xml 生成,调整生成 至 根目录
    /*        TemplateConfig tc = new TemplateConfig();
            tc.setXml(null);
            mpg.setTemplate(tc);*/
    
            // 自定义模板配置,可以 copy 源码 mybatis-plus/src/main/resources/templates 下面内容修改,
            // 放置自己项目的 src/main/resources/templates 目录下, 默认名称一下可以不配置,也可以自定义模板名称
            // TemplateConfig tc = new TemplateConfig();
            // tc.setController("...");
            // tc.setEntity("...");
            // tc.setMapper("...");
            // tc.setXml("...");
            // tc.setService("...");
            // tc.setServiceImpl("...");
            // 如上任何一个模块如果设置 空 OR Null 将不生成该模块。
            // mpg.setTemplate(tc);
    
            // 执行生成
            mpg.execute();
    
            // 打印注入设置【可无】
            System.err.println(mpg.getCfg().getMap().get("abc"));
        }
    
    }
    

    三、项目生成后的存放地址以及代码如下

    ① 项目的包结构如下:


    项目层级如图所示:

    ②controller代码如下:

    package com.hytc.mall.hytcmall.controller;
    
    
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import org.springframework.stereotype.Controller;
    
    /**
     * <p>
     * 数据字典 前端控制器
     * </p>
     *
     * @author baiYP
     * @since 2020-09-24
     */
    @Controller
    @RequestMapping("sysDict")
    public class SysDictController {
    
    }
    
    控制器如图所示

    ③service代码如下:

    package com.hytc.mall.hytcmall.service;
    
    import com.hytc.mall.hytcmall.entity.SysDict;
    import com.baomidou.mybatisplus.extension.service.IService;
    
    /**
     * <p>
     * 数据字典 服务类
     * </p>
     *
     * @author baiYP
     * @since 2020-09-24
     */
    public interface ISysDictService extends IService<SysDict> {
    
    }
    
    业务类如图所示:

    ④serviceImpl实现类如下:

    package com.hytc.mall.hytcmall.service.mpl;
    
    import com.hytc.mall.hytcmall.entity.SysDict;
    import com.hytc.mall.hytcmall.mapper.SysDictMapper;
    import com.hytc.mall.hytcmall.service.ISysDictService;
    import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
    import org.springframework.stereotype.Service;
    
    /**
     * <p>
     * 数据字典 服务实现类
     * </p>
     *
     * @author baiYP
     * @since 2020-09-24
     */
    @Service
    public class SysDictServiceImpl extends ServiceImpl<SysDictMapper, SysDict> implements ISysDictService {
    
    }
    
    业务类实现如图所示:

    ⑤entity实体如下:

    package com.hytc.mall.hytcmall.entity;
    
    import com.baomidou.mybatisplus.annotation.IdType;
    import com.baomidou.mybatisplus.extension.activerecord.Model;
    import com.baomidou.mybatisplus.annotation.TableId;
    import java.time.LocalDateTime;
    import java.io.Serializable;
    
    /**
     * <p>
     * 数据字典
     * </p>
     *
     * @author baiYP
     * @since 2020-09-24
     */
    public class SysDict extends Model<SysDict> {
    
        private static final long serialVersionUID = 1L;
    
        /**
         * 主键
         */
        @TableId(value = "id", type = IdType.AUTO)
        private Integer id;
    
        /**
         * 名称
         */
        private String name;
    
        /**
         * 父级ID
         */
        private Integer parentId;
    
        /**
         * 排序
         */
        private Integer sort;
    
        /**
         * 类型
         */
        private Integer type;
    
        /**
         * 创建人
         */
        private Integer createBy;
    
        /**
         * 创建时间
         */
        private LocalDateTime createDate;
    
        public Integer getId() {
            return id;
        }
    
        public SysDict setId(Integer id) {
            this.id = id;
            return this;
        }
        public String getName() {
            return name;
        }
    
        public SysDict setName(String name) {
            this.name = name;
            return this;
        }
        public Integer getParentId() {
            return parentId;
        }
    
        public SysDict setParentId(Integer parentId) {
            this.parentId = parentId;
            return this;
        }
        public Integer getSort() {
            return sort;
        }
    
        public SysDict setSort(Integer sort) {
            this.sort = sort;
            return this;
        }
        public Integer getType() {
            return type;
        }
    
        public SysDict setType(Integer type) {
            this.type = type;
            return this;
        }
        public Integer getCreateBy() {
            return createBy;
        }
    
        public SysDict setCreateBy(Integer createBy) {
            this.createBy = createBy;
            return this;
        }
        public LocalDateTime getCreateDate() {
            return createDate;
        }
    
        public SysDict setCreateDate(LocalDateTime createDate) {
            this.createDate = createDate;
            return this;
        }
    
        @Override
        protected Serializable pkVal() {
            return this.id;
        }
    
        @Override
        public String toString() {
            return "SysDict{" +
                "id=" + id +
                ", name=" + name +
                ", parentId=" + parentId +
                ", sort=" + sort +
                ", type=" + type +
                ", createBy=" + createBy +
                ", createDate=" + createDate +
            "}";
        }
    }
    
    
    实体如图所示:

    ⑥mapper接口如下:

    package com.hytc.mall.hytcmall.mapper;
    
    import com.hytc.mall.hytcmall.entity.SysDict;
    import com.baomidou.mybatisplus.core.mapper.BaseMapper;
    
    /**
     * <p>
     * 数据字典 Mapper 接口
     * </p>
     *
     * @author baiYP
     * @since 2020-09-24
     */
    public interface SysDictMapper extends BaseMapper<SysDict> {
    
    }
    
    mapper接口如图所示:

    ⑦mapper.xml如下

    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.hytc.mall.hytcmall.mapper.SysDictMapper">
    
        <!-- 通用查询映射结果 -->
        <resultMap id="BaseResultMap" type="com.hytc.mall.hytcmall.entity.SysDict">
            <id column="id" property="id" />
            <result column="name" property="name" />
            <result column="parent_id" property="parentId" />
            <result column="sort" property="sort" />
            <result column="type" property="type" />
            <result column="create_by" property="createBy" />
            <result column="create_date" property="createDate" />
        </resultMap>
    
        <!-- 通用查询结果列 -->
        <sql id="Base_Column_List">
            id, name, parent_id, sort, type, create_by, create_date
        </sql>
    
    </mapper>
    
    mapper.xml如图所示:

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