目录
一、相关版本
二、Maven因引入相关依赖
三、SpringBoot配置文件
四、代码生成工具
五、实现用户服务模块案例
1、Controller
2、Service
3、Entity
4、Mapper
5、接口测试
一、相关版本
| 工具 | 版本 |
| Idea | 2022.3.2 |
| Springboot | 2.7.12 |
| MyBatis | 3.5.3.1 |
| MySQL | 8.0.28 |
| JDK | 1.8 |
相关代码已分享到Gitee：
https://gitee.com/Vmetrio/kotlin-springboot
https://gitee.com/Vmetrio/kotlin-springboot项目结构：
二、Maven因引入相关依赖
<?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>2.7.12</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>springboot</artifactId><version>0.0.1-SNAPSHOT</version><name>springboot</name><description>springboot</description><properties><java.version>1.8</java.version><kotlin.version>1.8.20</kotlin.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.fasterxml.jackson.module</groupId><artifactId>jackson-module-kotlin</artifactId></dependency><dependency><groupId>org.jetbrains.kotlin</groupId><artifactId>kotlin-reflect</artifactId></dependency><dependency><groupId>org.jetbrains.kotlin</groupId><artifactId>kotlin-stdlib-jdk8</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!--mysql--><dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId></dependency><!--mybatis--><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.5.3.1</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-annotation</artifactId><version>3.5.3.1</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-extension</artifactId><version>3.5.3.1</version></dependency><!--MyabtisPlus 代码生成器--><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-generator</artifactId><version>3.5.3.1</version></dependency><dependency><groupId>org.apache.velocity</groupId><artifactId>velocity-engine-core</artifactId><version>2.3</version></dependency></dependencies><build><sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory><testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin><plugin><groupId>org.jetbrains.kotlin</groupId><artifactId>kotlin-maven-plugin</artifactId><configuration><args><arg>-Xjsr305=strict</arg></args><compilerPlugins><plugin>spring</plugin></compilerPlugins></configuration><dependencies><dependency><groupId>org.jetbrains.kotlin</groupId><artifactId>kotlin-maven-allopen</artifactId><version>${kotlin.version}</version></dependency></dependencies></plugin></plugins></build></project>
三、SpringBoot配置文件
server:port: 8080spring:datasource:url: jdbc:mysql://${MYSQL_HOST:localhost}:${MYSQL_PORT:3306}/${MYSQL_DB:demo}?useSSL=false&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&transformedBitIsBoolean=true&serverTimezone=Asia/Shanghai&nullCatalogMeansCurrent=true&allowPublicKeyRetrieval=trueusername: ${MYSQL_USERNAME:root}password: ${MYSQL_PWD:123456789}driverClassName: com.mysql.cj.jdbc.Driver## Hikari 连接池配置hikari:## 最小空闲连接数量minimum-idle: 10## 空闲连接存活最大时间，默认600000（10分钟）idle-timeout: 18000## 连接池最大连接数，默认是10maximum-pool-size: 1000## 此属性控制从池返回的连接的默认自动提交行为,默认值：trueauto-commit: true## 连接池母子pool-name: DatebookHikariCP## 此属性控制池中连接的最长生命周期，值0表示无限生命周期，默认1800000即30分钟max-lifetime: 1800000## 数据库连接超时时间,默认30秒，即30000connection-timeout: 300000connection-test-query: SELECT 1jackson:date-format: yyyy-MM-dd HH:mm:sstime-zone: Asia/Shanghaimybatis-plus:mapper-locations: classpath*:mapper/*.xml,classpath*:mapping/*.xml#MyBatis 别名包扫描路径，通过该属性可以给包中的类注册别名，多个路径用逗号分割type-aliases-package: com.example.springboot.entityglobal-config:db-config:id-type: AUTO # 全局默认主键策略，默认为雪花ID，若表中设置了自增，则生成的实体自动添加自增ID属性，参考 TestDeletelogic-delete-field: deleted # 全局逻辑删除的实体字段名，若不配置，则不启用logic-delete-value: 1 # 逻辑已删除值(默认为 1)logic-not-delete-value: 0 # 逻辑未删除值(默认为 0)configuration:map-underscore-to-camel-case: true # 驼峰转下划线（默认）log-impl: org.apache.ibatis.logging.stdout.StdOutImpl # 日志输出四、代码生成工具
package com.example.springbootimport com.baomidou.mybatisplus.generator.AutoGenerator
import com.baomidou.mybatisplus.generator.config.DataSourceConfig
import com.baomidou.mybatisplus.generator.config.GlobalConfig
import com.baomidou.mybatisplus.generator.config.PackageConfig
import com.baomidou.mybatisplus.generator.config.StrategyConfig/*** 代码生成*/
fun main() {AutoGenerator(// 设置数据源/*** url: jdbc:mysql://localhost:3306/demo?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&AllowPublicKeyRetrieval=True* username: 用户名* password: 密码*/DataSourceConfig.Builder("jdbc:mysql://localhost:3306/demo?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&AllowPublicKeyRetrieval=True","root","123456789").build()).run {// 全局配置global(GlobalConfig.Builder()// 启用 Kotlin.enableKotlin()/*** 输出路径* System.getProperty("user.dir") 得到的是这个项目的目录* /src/main/kotlin 是你代码的存放目录，如果你是多模块项目，记得加上你的模块名* 比如 service-oa-parent* |- service-oa* |- model* 你想在 service-oa 中生成，那么应该填入: System.getProperty("user.dir") + "/service-oa/src/main/kotlin"*/.outputDir(System.getProperty("user.dir") + "/src/main/kotlin")// 作者.author("meng")// 设置生成完毕后是否展开你 idea 的目录，不影响结果.disableOpenDir().build())// 包信息配置packageInfo(PackageConfig.Builder()/*** 假定下列代码的目录结构为:* com.goxiaogle.auth* |- controller* |- service* |- impl* |- mapper* 则 com.goxiaogle 为父包，auth 为模块名*/// 设置父包.parent("com.example")// 设置模块名.moduleName("springboot")// 以下四个可以去掉，如果你的分包命名和他一样// 设置 Controller 层包名，默认就是 controller.controller("controller")// 设置 Service 层包名，默认就是 service.service("service")// 设置 Mapper 层包名，默认就是 mapper.mapper("mapper")// 设置 Entity 包名，默认就是 entity.entity("entity").build())// 策略配置strategy(StrategyConfig.Builder()// 设置要生成代码的数据库表名，可以设置多个，如 addInclude(a, b, c).addInclude("user")// 设置生成的 service 接口命名方式，默认是 IXxxService，这里改成 XxxService// serviceBuilder() 方法建议在 build 后使用，此处偷懒直接用了.serviceBuilder().formatServiceFileName("%sService").mapperBuilder().enableFileOverride().enableBaseColumnList().enableBaseResultMap().build()// 设置其它几层的内容// .entityBuilder()// .controllerBuilder()// .mapperBuilder().build())// 执行execute()}
}五、实现用户服务模块案例
1、Controller
package com.example.springboot.controller;import com.example.springboot.entity.UserEntity
import com.example.springboot.service.UserService
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.PostMapping
import org.springframework.web.bind.annotation.RestController
import javax.annotation.Resource
import javax.servlet.http.HttpServletRequest/*** <p>* 用户服务* </p>** @author meng* @since 2024-02-03*/
@RestController
@RequestMapping("/user")
class UserController {// 需要注意和java不同的是，如果有bean的注入，需要在前面加上lateinit@Resourcelateinit var userService: UserService;@PostMapping("/getUserById")fun getUserById(req: HttpServletRequest): UserEntity {val id: String = req.getParameter("id")val info: UserEntity = userService.findUserById(id)return info}
}2、Service
package com.example.springboot.service;import com.example.springboot.entity.UserEntity;
import com.baomidou.mybatisplus.extension.service.IService;/*** <p>* 服务类* </p>** @author meng* @since 2024-02-03*/
interface UserService : IService<UserEntity> {fun findUserById(userId: String): UserEntity
}
package com.example.springboot.service.impl;import com.example.springboot.entity.UserEntity;
import com.example.springboot.mapper.UserMapper;
import com.example.springboot.service.UserService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;
import javax.annotation.Resource/*** <p>* 服务实现类* </p>** @author meng* @since 2024-02-03*/
@Service
open class UserServiceImpl : ServiceImpl<UserMapper, UserEntity>(), UserService {@Resourcelateinit var userMapper: UserMapperoverride fun findUserById(userId: String): UserEntity {return userMapper.findUserById(userId)}}
3、Entity
package com.example.springboot.entity;import java.io.Serializable;/*** <p>* * </p>** @author meng* @since 2024-02-03*/
class UserEntity : Serializable {var id: String? = nullvar name: String? = nulloverride fun toString(): String {return "User{" +"id=" + id +", name=" + name +"}"}
}
4、Mapper
package com.example.springboot.mapper;import com.example.springboot.entity.UserEntity;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Mapper/*** <p>* Mapper 接口* </p>** @author meng* @since 2024-02-03*/
@Mapper
interface UserMapper : BaseMapper<UserEntity> {//根据id获取用户信息fun findUserById(id: String): UserEntity
}
xml：
<?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.example.springboot.mapper.UserMapper"><!-- 通用查询映射结果 --><resultMap id="BaseResultMap" type="com.example.springboot.entity.UserEntity"><id column="id" property="id" /><result column="name" property="name" /></resultMap><!-- 通用查询结果列 --><sql id="Base_Column_List">id, name</sql><select id="findUserById" resultMap="BaseResultMap" >SELECT<include refid="Base_Column_List" />FROM userWHERE id = #{id}</select></mapper>
5、接口测试
![[基础IO]文件描述符{重定向/perror/磁盘结构/inode/软硬链接}](https://img-blog.csdnimg.cn/direct/5961092a4bec43fd8072e0f2d69da3ed.png)
