CODEWITHSUNDEEP
spring-bootrestkotlinresponsefeign
NeverSleeps
NeverSleeps

Reputation: 1892

Decode response body from feign client to MyObject

I have created a Feign client StorageClient like as shown below:

@Headers(HttpHeaders.ACCEPT + ": " + MediaType.APPLICATION_JSON_UTF8_VALUE)
interface StorageApi {
    @RequestLine("GET /api/v1/files/{fileId}")
    fun getFileMeta(@Param("fileId") fileId: Long): Response
}

@Service
class StorageClient(private val storageApi: StorageApi) {
    fun getFile(fileId: Long): StorageFile = storageApi.getFileMeta(fileId)
}

In addition to the StorageClient client, the getFileMeta() method (interface StorageApi) is also used to check for the the status (method isFileExists()):

fun isFileExists(fileId: Long): Boolean = storageApi.getFileMeta(fileId).status() != 404

For this reason, I cannot write explicitly:

@RequestLine("GET /api/v1/files/{fileId}")
fun getFileMeta(@Param("fileId") fileId: Long): StorageFile

How can I decode the Response body so that it is possible to return an object of type StorageFile from the getFile() (class StorageClient) method? Or maybe there is some way to work with both the status of the received Response and its body?

Upvotes: 0

Views: 8764

Answers (1)

Markus
Markus

Reputation: 1767

This answer is a little late, you can decode the body manually using a JSON deserializer such as Jackson:

import com.fasterxml.jackson.databind.ObjectMapper
import org.apache.commons.io.IOUtils

val json = IOUtils.toString(response.body().asInputStream(), Charsets.UTF_8)
val storageFile = ObjectMapper().readValue(json, StorageFile::class.java)

Make sure to add Jackson as dependency. For example in your pom.xml if you're using maven:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>..</version>
</dependency>

An in-depth tutorial on Jackson is available here: https://www.baeldung.com/jackson-object-mapper-tutorial.

Important notice: Make sure to call response.close() when you're done. Otherwise this will lead to a resource leak.

Upvotes: 2

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