前几天由于工作需要，便开始学习了kotlin,java基础扎实学起来也还算比较快，对于kotlin这个编程语言自然是比java有趣一些，下面这篇文章主要给大家介绍了关于Spring Boot + Kotlin整合MyBatis的方法教程，需要的朋友可以参考下。
前言
最近使用jpa比较多，再看看mybatis的xml方式写sql觉得不爽，接口定义与映射离散在不同文件中，使得阅读起来并不是特别方便。
因此使用Spring Boot去整合MyBatis，在注解里写sql
参考《我的第一个Kotlin应用》
创建项目，在build.gradle文件中引入依赖
compile "org.mybatis.spring.boot:mybatis-spring-boot-starter:$mybatis_version" compile "mysql:mysql-connector-java:$mysql_version"
完整的build.gradle文件
group 'name.quanke.kotlin' version '1.0-SNAPSHOT' buildscript { ext.kotlin_version = '1.2.10' ext.spring_boot_version = '1.5.4.RELEASE' ext.springfox_swagger2_version = '2.7.0' ext.mysql_version = '5.1.21' ext.mybatis_version = '1.1.1' repositories { mavenCentral() } dependencies { classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" classpath("org.springframework.boot:spring-boot-gradle-plugin:$spring_boot_version") // Kotlin整合SpringBoot的默认无参构造函数，默认把所有的类设置open类插件 classpath("org.jetbrains.kotlin:kotlin-noarg:$kotlin_version") classpath("org.jetbrains.kotlin:kotlin-allopen:$kotlin_version") } } apply plugin: 'kotlin' apply plugin: "kotlin-spring" // See https://kotlinlang.org/docs/reference/compiler-plugins.html#kotlin-spring-compiler-plugin apply plugin: 'org.springframework.boot' apply plugin: "kotlin-jpa" //https://stackoverflow.com/questions/32038177/kotlin-with-jpa-default-constructor-hell jar { baseName = 'chapter11-6-5-service' version = '0.1.0' } repositories { mavenCentral() } dependencies { compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version" compile("org.jetbrains.kotlin:kotlin-reflect:${kotlin_version}") compile "org.mybatis.spring.boot:mybatis-spring-boot-starter:$mybatis_version" compile "mysql:mysql-connector-java:$mysql_version" testCompile "org.springframework.boot:spring-boot-starter-test:$spring_boot_version" testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version" } compileKotlin { kotlinOptions.jvmTarget = "1.8" } compileTestKotlin { kotlinOptions.jvmTarget = "1.8" }在application.yml文件中配置mysql的连接
spring: datasource: url: jdbc:mysql://localhost:3306/test username: root password: 123456 driver-class-name: com.mysql.jdbc.Driver
使用MyBatis
在Mysql中创建User表，包含id(BIGINT)、username(VARCHAR)、age(INT)字段。同时，创建映射对象User
data class User(var id: Long? = -1, var username: String = "", val age: Int? = 0)
创建User映射的操作UserMapper，为了后续单元测试验证，实现插入和查询操作
import name.quanke.kotlin.chaper11_6_5.entity.User import org.apache.ibatis.annotations.Insert import org.apache.ibatis.annotations.Mapper import org.apache.ibatis.annotations.Param import org.apache.ibatis.annotations.Select /** * Created by http://quanke.name on 2018/1/11. */ @Mapper interface UserMapper { @Select("SELECT * FROM USER WHERE USERNAME = #{username}") fun findByUserName(@Param("username") username: String): List @Insert("INSERT INTO USER(USERNAME, PASSWORD) VALUES(#{username}, #{password})") fun insert(@Param("username") username: String, @Param("password") password: String): Int } 启动 Spring Boot 类
import org.springframework.boot.SpringApplication import org.springframework.boot.autoconfigure.SpringBootApplication /** * Created by http://quanke.name on 2018/1/9. */ @SpringBootApplication class Application fun main(args: Array) { SpringApplication.run(Application::class.java, *args) }
单元测试
import name.quanke.kotlin.chaper11_6_5.repository.UserMapper import org.apache.commons.logging.LogFactory import org.junit.Test import org.junit.runner.RunWith import org.springframework.boot.test.context.SpringBootTest import org.springframework.test.context.junit4.SpringRunner import javax.annotation.Resource /** * Created by http://quanke.name on 2018/1/9. */ @RunWith(SpringRunner::class) @SpringBootTest class ApplicationTests { val log = LogFactory.getLog(ApplicationTests::class.java)!! @Resource lateinit var userMapper: UserMapper @Test fun `MyBatis test"`() { log.info("查询用户名为【quanke.name】的用户：${userMapper.findByUserName("quanke.name")}") userMapper.insert("quanke", "123") log.info("查询用户名为【quanke】的用户：${userMapper.findByUserName("quanke")}") } }总结
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