Spring Boot 3.2 RestClient

https://spring.io/blog/2023/07/13/new-in-spring-6-1-restclient

New in Spring 6.1: RestClient

1. 일반적인 구현

 

Bean 등록

    ...
    @Bean
    fun fakeClassRestClient(): RestClient {
        return RestClient.builder().baseUrl("https://dummy-json.mock.beeceptor.com")
            .requestFactory(requestFactory())
            .defaultHeaders { headers: HttpHeaders ->
                headers.set(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
                headers.set("header-custom", "9999-9999-1234")
            }
            .build()
    }
    ...

 

Service

@Service
class FakeClassRestClientService(
    private val fakeRestClient: RestClient
) {
    fun posts(): List<Post> {
        return fakeRestClient.get()
            .uri("/posts")
            .retrieve()
            .body(object : ParameterizedTypeReference<List<Post>>(){})!!
    }

    fun post(): Post {
        return fakeRestClient.get()
            .uri("/posts/1")
            .retrieve()
            .body(object : ParameterizedTypeReference<Post>(){})!!
    }
}

 

Test

@SpringBootTest(classes = [SpringBootEduApplication::class])
class FakeClassRestClientServiceTest(
    sut: FakeClassRestClientService
) : StringSpec(
    {
        val log = KotlinLogging.logger {}

        "RestClient 목록 조회" {
            val posts = sut.posts()
            log.info{posts}
            posts.size shouldBeGreaterThan 0
        }

        "RestClient 단건 조회" {
            val post = sut.post()
            log.info{post}
            post shouldNotBe null
        }
    }
)

 

 

2. 인터페이스 기반

설정

    @Bean
    fun fakeRestClientService(): FakeRestClientService {
        val client = RestClient.builder().baseUrl("https://dummy-json.mock.beeceptor.com")
			.requestFactory(requestFactory())
			.defaultHeaders { headers: HttpHeaders ->
                headers.set(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
                headers.set("header-custom", "9999-9999-1234")
            }
            .build()
        val factory = HttpServiceProxyFactory
            .builderFor(RestClientAdapter.create(client))
            .build()
        return factory.createClient(FakeRestClientService::class.java)
    }

 

인터페이스

interface FakeRestClientService {
    @GetExchange("/posts")
    fun posts(): List<Post>

    @GetExchange("/posts/1")
    fun post(@RequestParam id: Long): Post
}

 

Test

@SpringBootTest(classes = [SpringBootEduApplication::class])
class FakeRestClientServiceTest(
    sut: FakeRestClientService
) : StringSpec(
    {
        val log = KotlinLogging.logger {}

        "RestClient 목록 조회" {
            val posts = sut.posts()
            log.info{posts}
            posts.size shouldBeGreaterThan 0
        }

        "RestClient 단건 조회" {
            val post = sut.post(1)
            log.info{post}
            post.id shouldBe 1
        }
    }
)

https://github.com/KimHyeongi/spring-boot-edu

 

GitHub - KimHyeongi/spring-boot-edu: spring boot 이것저것