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Dubbo Project Structure

• provider : provide service implementation
• consumer : calling service offered by provider
• registry center : roled by nacos, register service that can be discovered by consumer
• config center : roled by nacos, offer cloud configurations

Declare Plugins and Repositories

pluginManagement {repositories {gradlePluginPortal()google()mavenCentral()}
}dependencyResolutionManagement {repositoriesMode = RepositoriesMode.PREFER_SETTINGSrepositories {gradlePluginPortal()google()mavenCentral()}
}buildscript {repositories {gradlePluginPortal()google()mavenCentral()}
}plugins {id("org.jetbrains.kotlin.jvm") version "2.0.21" apply falseid("org.jetbrains.kotlin.kapt") version "2.0.21" apply falseid("org.jetbrains.kotlin.plugin.spring") version "2.0.21" apply falseid("org.springframework.boot") version "3.4.1" apply false
}include("dubbo-provider")
include("dubbo-consumer")

Introduce Dependencies

suitable for both provider and consumer modules

plugins {id("org.jetbrains.kotlin.jvm")id("org.jetbrains.kotlin.kapt")id("org.jetbrains.kotlin.plugin.spring")id("org.springframework.boot")
}java {toolchain {languageVersion = JavaLanguageVersion.of(17)}
}dependencies {val springBootVersion = "3.4.2"val springCloudVersion = "4.2.0"val springCloudAlibabaVersion = "2023.0.3.2"// commonsapi("io.github.hellogoogle2000:kotlin-commons:1.0.19")// kotlinapi("org.jetbrains.kotlin:kotlin-reflect:2.0.21")// springapi("org.springframework.boot:spring-boot-starter:$springBootVersion")api("org.springframework.boot:spring-boot-starter-web:$springBootVersion")api("org.springframework.boot:spring-boot-starter-actuator:$springBootVersion")api("org.springframework.cloud:spring-cloud-starter-bootstrap:$springCloudVersion")// dubboapi("org.apache.dubbo:dubbo-spring-boot-starter:3.3.3")api("org.apache.dubbo:dubbo-nacos-spring-boot-starter:3.3.3")api("com.alibaba.cloud:spring-cloud-starter-alibaba-nacos-discovery:$springCloudAlibabaVersion")
}

Dubbo Consumer Properties

# service
server.port=10003
spring.application.name=dubbo-consumer
spring.profiles.active=dev
spring.devtools.add-properties=false
# dubbo
dubbo.application.name=dubbo-consumer
dubbo.application.qos-port=20003
dubbo.registry.address=nacos://localhost:8848
dubbo.registry.username=nacos
dubbo.registry.password=nacos
dubbo.protocol.name=dubbo
dubbo.protocol.port=30003
# nacos
spring.cloud.nacos.discovery.server-addr=localhost:8848
spring.cloud.nacos.discovery.username=nacos
spring.cloud.nacos.discovery.password=nacos

Dubbo Provider Application

package x.spring.helloimport org.apache.dubbo.config.spring.context.annotation.DubboComponentScan
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication
import org.springframework.cloud.client.discovery.EnableDiscoveryClient@SpringBootApplication
@EnableDiscoveryClient
@DubboComponentScan(basePackages = ["x.spring.hello"])
class DubboProviderApplicationfun main(args: Array<String>) {runApplication<DubboProviderApplication>(*args)
}

Dubbo Provider Service

package x.spring.hello.serviceinterface DubboConfigService {fun loadConfig(): String
}

package x.spring.hello.serviceimport org.apache.dubbo.config.annotation.DubboService@DubboService
class DubboConfigServiceImpl : DubboConfigService {override fun loadConfig(): String {return "dubbo-provider-config"}
}

Dubbo Consumer Properties

# service
server.port=10003
spring.application.name=dubbo-consumer
spring.profiles.active=dev
spring.devtools.add-properties=false
# dubbo
dubbo.application.name=dubbo-consumer
dubbo.application.qos-port=20003
dubbo.registry.address=nacos://localhost:8848
dubbo.registry.username=nacos
dubbo.registry.password=nacos
dubbo.protocol.name=dubbo
dubbo.protocol.port=30003
# nacos
spring.cloud.nacos.discovery.server-addr=localhost:8848
spring.cloud.nacos.discovery.username=nacos
spring.cloud.nacos.discovery.password=nacos

Dubbo Consumer Application

package x.spring.helloimport org.apache.dubbo.config.spring.context.annotation.DubboComponentScan
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication
import org.springframework.cloud.client.discovery.EnableDiscoveryClient@SpringBootApplication
@EnableDiscoveryClient
@DubboComponentScan(basePackages = ["x.spring.hello"])
class DubboConsumerApplicationfun main(args: Array<String>) {runApplication<DubboConsumerApplication>(*args)
}

Dubbo Consumer Controller

package x.spring.hello.serviceinterface DubboConfigService {fun loadConfig(): String
}

package x.spring.hello.controllerimport org.apache.dubbo.config.annotation.DubboReference
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.RestController
import x.spring.hello.service.DubboConfigService@RestController
class DubboConfigController {@DubboReferenceprivate lateinit var service: DubboConfigService@GetMapping("/dubbo/config")fun load(): String {return service.loadConfig()}
}

Command References

nacos=sudo bash -f bin/startup.sh -m standalone
url=http://localhost:8848/nacos
url=http://localhost:10003/dubbo/config