feat : 게시글 조회 FeignClient 컴포넌트 추가

놀이터(예제 코드 작성)/spring-cloud-open-feign/src/main/kotlin/com/banjjoknim/springcloudopenfeign/SpringCloudOpenFeignApplication.kt

@@ -2,7 +2,9 @@ package com.banjjoknim.springcloudopenfeign
 
 import org.springframework.boot.autoconfigure.SpringBootApplication
 import org.springframework.boot.runApplication
+import org.springframework.cloud.openfeign.EnableFeignClients
 
+@EnableFeignClients
 @SpringBootApplication
 class SpringCloudOpenFeignApplication
 

놀이터(예제 코드 작성)/spring-cloud-open-feign/src/main/kotlin/com/banjjoknim/springcloudopenfeign/configuration/FeignConfiguration.kt

@@ -0,0 +1,15 @@
+package com.banjjoknim.springcloudopenfeign.configuration
+
+import com.fasterxml.jackson.databind.DeserializationFeature
+import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer
+import org.springframework.context.annotation.Configuration
+import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder
+
+@Configuration
+class FeignConfiguration : Jackson2ObjectMapperBuilderCustomizer {
+    override fun customize(jacksonObjectMapperBuilder: Jackson2ObjectMapperBuilder) {
+        jacksonObjectMapperBuilder
+            .featuresToEnable(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL)
+            .featuresToDisable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
+    }
+}

놀이터(예제 코드 작성)/spring-cloud-open-feign/src/main/kotlin/com/banjjoknim/springcloudopenfeign/domain/Post.kt

@@ -0,0 +1,8 @@
+package com.banjjoknim.springcloudopenfeign.domain
+
+data class Post(
+    val userId: Long,
+    val id: Long,
+    val title: String,
+    val completed: Boolean
+)

놀이터(예제 코드 작성)/spring-cloud-open-feign/src/main/kotlin/com/banjjoknim/springcloudopenfeign/domain/PostClient.kt

@@ -0,0 +1,15 @@
+package com.banjjoknim.springcloudopenfeign.domain
+
+import org.springframework.cloud.openfeign.FeignClient
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PathVariable
+
+@FeignClient(value = "postClient", url = "https://jsonplaceholder.typicode.com/")
+interface PostClient {
+
+    @GetMapping("/posts")
+    fun findPosts(): List<Post>
+
+    @GetMapping("/posts/{postId}")
+    fun findPost(@PathVariable postId: Long): Post
+}

놀이터(예제 코드 작성)/spring-cloud-open-feign/src/main/kotlin/com/banjjoknim/springcloudopenfeign/domain/PostController.kt

@@ -0,0 +1,21 @@
+package com.banjjoknim.springcloudopenfeign.domain
+
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PathVariable
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+class PostController(
+    private val postClient: PostClient
+) {
+
+    @GetMapping("/posts")
+    fun posts(): List<Post> {
+        return postClient.findPosts()
+    }
+
+    @GetMapping("/posts/{postId}")
+    fun post(@PathVariable postId: Long): Post {
+        return postClient.findPost(postId)
+    }
+}