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使用kotlin集成springboot开发代码实例
时间：2022-06-29 02:12:51 编辑：袖梨 来源：一聚教程网
本篇文章小编给大家分享一下使用kotlin集成springboot开发代码实例，文章代码介绍的很详细，小编觉得挺不错的，现在分享给大家供大家参考，有需要的小伙伴们可以来看看。
目前大多数都在使用java集成springboot进行开发，本文演示仅仅将java换成kotlin，其他不变的情况下进行开发。
一、安装支持插件
在idea中安装kotlin插件（大多数情况下会默认安装了）
二、maven配置 注意
kotlin目前不支持lombok所以不能使用或引用lombok相关的插件或依赖包，下面是一个排除示例，同时也不支持maven-enforcer-plugin
com.ayouran.common a-common 1.0.0-SNAPSHOT org.projectlombok lombok
maven的属性配置
UTF-8 UTF-8 1.8 1.8 1.8 1.3.21 true enable 2.2.4.RELEASE Hoxton.SR1 2.7.0 com.lc.github.KotlinDemoApplication 4.2.1 1.3.1.Final
必要的依赖
org.jetbrains.kotlin kotlin-reflect ${kotlin.version} org.jetbrains.kotlin kotlin-stdlib-jdk8 ${kotlin.version}
编译部分
org.jetbrains.kotlin kotlin-maven-plugin true ${kotlin.language.version} org.jetbrains.kotlin kotlin-maven-allopen ${kotlin.version} kapt kapt true src/main/kotlin src/main/java com.google.dagger dagger-compiler 2.9 com.querydsl querydsl-apt ${querydsl.version} jpa org.mapstruct mapstruct-processor ${mapstruct.version} compile compile src/main/kotlin src/main/java test-kapt test-kapt src/test/kotlin src/test/java com.google.dagger dagger-compiler 2.9 com.querydsl querydsl-apt ${querydsl.version} jpa org.mapstruct mapstruct-processor ${mapstruct.version} test-compile test-compile src/test/kotlin src/test/java target/generated-sources/kapt/test org.apache.maven.plugins maven-compiler-plugin 3.8.1 none ${java.version} ${java.version} org.projectlombok lombok ${lombok.version} org.mapstruct mapstruct-processor ${mapstruct.version} -Amapstruct.suppressGeneratorTimestamp=true -Amapstruct.defaultComponentModel=spring default-compile none default-testCompile none java-compile compile compile java-test-compile test-compile testCompile org.apache.maven.plugins maven-assembly-plugin 2.6 make-assembly package single ${main.class} jar-with-dependencies
有java与kotlin混合的情况，在上面的
org.apache.maven.plugins maven-compiler-plugin 3.8.1 none ${java.version} ${java.version} org.mapstruct mapstruct-processor ${mapstruct.version} -Amapstruct.suppressGeneratorTimestamp=true -Amapstruct.defaultComponentModel=spring default-compile none default-testCompile none java-compile compile compile java-test-compile test-compile testCompile
此maven配置集成了querydsl、mapstruct、dagger2的编译，基本上能满足常规的使用
三、类
四、编写入口函数
springboot的启动方法及swagger的配置
@EnableAsync
@EnableSwagger2
@EnableScheduling
@SpringBootApplication
class KotlinDemoApplication : CommandLineRunner {
companion object {
@JvmStatic
fun main(args: Array) {
SpringApplication.run(KotlinDemoApplication::class.java, *args)
}
}
@Bean
fun api(): Docket {
return Docket(DocumentationType.SWAGGER_2)
.ignoredParameterTypes(Session::class.java)
.select()
// .apis(RequestHandlerSelectors.any())
.apis(RequestHandlerSelectors.basePackage("com.ayouran.flow.controllers"))
.paths(PathSelectors.any())
.build()
.apiInfo(ApiInfoBuilder()
.description("ayouram-flow相关API")
.title("ayouram-flow")
.version("1.0")
.build())
.pathMapping("/")
}
override fun run(vararg args: String?) {
println("*************************** ok ***********************************")
}
}
五、创建数据库对象
import com.fasterxml.jackson.annotation.JsonFormat
import org.hibernate.annotations.DynamicInsert
import org.hibernate.annotations.DynamicUpdate
import java.util.*
import javax.persistence.*
/****
* 设备流量规则
*/
@Entity
@Table(name = "device_rules",
indexes = [Index(name = "device_no", columnList = "device_no"),
Index(name = "rules_no", columnList = "rules_no"),
Index(name = "deleted", columnList = "deleted")],
uniqueConstraints = [UniqueConstraint(name = "device_no_rules_no", columnNames = ["device_no", "rules_no"])])
@DynamicUpdate
@DynamicInsert
class DeviceRules {
@Id
@Column(name = "id", columnDefinition = "bigint(20) COMMENT 'ID,自增'")
@GeneratedValue(strategy = GenerationType.IDENTITY)
var id: Long? = null
@Column(name = "device_no", columnDefinition = "varchar(18) COMMENT '设备编号'")
var deviceNo: String? = null
@Column(name = "rules_no", columnDefinition = "varchar(18) COMMENT '规则编号'")
var rulesNo: String? = null
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
@Column(name = "create_at", columnDefinition = "datetime COMMENT '创建时间'")
var createAt: Date? = null
@Column(name = "update_at", columnDefinition = "datetime COMMENT '修改时间'")
var updateAt: Date? = null
/**
* 触发jpa update代码需要执行的逻辑
*/
@PreUpdate
fun preUpdate() {
updateAt = Date()
}
/**
* 自动设置必要字段的值
*/
@PrePersist
fun prePersist() {
updateAt = Date()
createAt = updateAt
deleted = BaseEnum.NOT_REMOVE.index
}
}
注解使用了hibernate的功能主要用于自动创建/更新表结构以及索引的生成，如果需要mybatis版本的，只需要去掉这里面的注释就好。
六、创建仓库操作接口
基于springboot-data-jpa的repository
@Repository interface DeviceRulesRepository : JpaRepository, JpaSpecificationExecutor , QuerydslPredicateExecutor { fun getAllByDeviceNoAndDeleted(deviceNo: String, deleted: Int): Optional > }
七、创建一个业务接口来声明业务
interface DeviceService {
/**
* 查询设备的路由规则
*/
fun queryDeviceFlowRules(aPageRequest: APageRequest): PageResult
}
八、创建一个业务接口实现来实现声明的业务
@Service
class DeviceServiceImpl @Autowired
constructor(private val deviceRepository: DeviceRepository,
private val deviceRulesRepository: DeviceRulesRepository,
private val querydslUtlis: QuerydslUtlis,
private val deviceMapstruct: DeviceMapstruct) : DeviceService {
private val logger = LoggerFactory.getLogger(javaClass)
override fun queryDeviceFlowRules(aPageRequest: APageRequest): PageResult {
val qDeviceRules = QDeviceRules.deviceRules
val qFlowRules = QFlowRules.flowRules
var rredicate: Predicate? = null
if (StringUtils.isNotBlank(aPageRequest.query)) rredicate = qDeviceRules.deviceNo.eq(aPageRequest.query)
val exprs = arrayOf>(qDeviceRules.deviceNo, qDeviceRules.deleted, qFlowRules.rulesNo, qFlowRules.flowMax,
qFlowRules.startTime, qFlowRules.endTime)
val results = querydslUtlis.getQueryFactory()
.select(*exprs)
.from(qDeviceRules)
.where(ExpressionUtils.allOf(rredicate))
.leftJoin(qFlowRules)
.on(qDeviceRules.rulesNo.eq(qFlowRules.rulesNo))
.orderBy(qDeviceRules.createAt.desc())
.offset((aPageRequest.pageIndex!! - 1) * aPageRequest.pageSize!!)
.limit(aPageRequest.pageSize!!)
.fetchResults()
return PageUtlis.retPage(results, querydslUtlis.getCollection(results.results, exprs, QueryDeviceFlowRulesVO::class.java) as Collection)
}
}
这里使用了querydsl来完成一个多表查询
九、创建一个 http服务接口
@RestWrapper
@RestController
@RequestMapping("/device")
@Api(value = "device", description = "设备相关接口", tags = ["device"])
class DeviceController @Autowired
constructor(private val deviceService: DeviceService) {
@GetMapping("/query_device")
fun queryDevice(aPageRequest: APageRequest) = deviceService.queryDevice(aPageRequest)
@GetMapping("/query_device_flow_rules")
fun queryDeviceFlowRules(aPageRequest: APageRequest) = deviceService.queryDeviceFlowRules(aPageRequest)
}
至此完成一个基本的开发过程，大多数情况下可以直接将java代码粘贴到kotlin文件中，会自动转换成合适的kotlin代码(偶尔需要自己调整，毕竟编辑器不是万能的)
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