AWS Java SDK 사용 방법
AWS Java SDK를 사용하여 오브젝트 스토리지를 사용하는 방법은 아래와 같습니다.
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AWS Java SDK를 사용하여 오브젝트 스토리지를 사용하는 방법은 아래와 같습니다.
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AWS Java v2 S3 SDK는 AWS에서 Java 코드를 통해 S3를 이용할 수 있도록 제공하는 도구입니다.
카페24 클라우드의 오브젝트 스토리지는 S3 API와 호환이 되므로 해당 SDK 사용이 가능합니다.
| 매뉴얼 테스트 버전 | Java v2 S3 SDK 참고 링크 |
|---|---|
Maven 프로젝트의 pom.xml에 dependency를 추가합니다.
<dependency>
<groupId>software.amazon.awssdk</groupId>
<artifactId>bom</artifactId>
<version>2.17.230</version>
<type>pom</type>
<scope>import</scope>
</dependency>[오브젝트 스토리지 사용 방법]을 참고하여 신청한 오브젝트 스토리지의 Access Key와 Secret Key를 확인합니다.
인증 파일을 생성하여 Access Key와 Secret Key를 등록합니다.
자세한 정보는 AWS SDK for Java v2 - Using Credentials에서 확인할 수 있습니다.
인증 파일의 기본 경로는 "~/.aws/credentials"입니다.
$ cat >> ~/.aws/credentials << EOF
[default]
aws_access_key_id = [access_key]
aws_secret_access_key = [secret_key]
EOF주의사항
사용하는 Java 및 SDK 버전에 따라 변경이 필요할 수 있습니다.
해당 내용은 AWS Java SDK를 사용하여 카페24 클라우드의 오브젝트 스토리지를 이용하는 예제 코드로, 필요에 따라 응용할 수 있습니다.
버킷을 생성합니다.
package cafe24.demo;
import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
import software.amazon.awssdk.core.waiters.WaiterResponse;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.CreateBucketRequest;
import software.amazon.awssdk.services.s3.model.HeadBucketRequest;
import software.amazon.awssdk.services.s3.model.HeadBucketResponse;
import software.amazon.awssdk.services.s3.model.S3Exception;
import software.amazon.awssdk.services.s3.waiters.S3Waiter;
import java.net.URI;
public class bucket_create {
public static void main(String[] args) {
final String endpoint_url = "https://kr.cafe24obs.com";
final String region_name = "kr1";
String bucketName = "test-bucket";
Region newRegion = Region.of(region_name);
ProfileCredentialsProvider credentialsProvider = ProfileCredentialsProvider.create();
S3Client s3Client = S3Client.builder()
.region(newRegion)
.endpointOverride(URI.create(endpoint_url))
.credentialsProvider(credentialsProvider)
.build();
System.out.format("Creating a bucket named %s\n", bucketName);
try {
S3Waiter s3Waiter = s3Client.waiter();
CreateBucketRequest bucketRequest = CreateBucketRequest.builder()
.bucket(bucketName)
.build();
s3Client.createBucket(bucketRequest);
HeadBucketRequest bucketRequestWait = HeadBucketRequest.builder()
.bucket(bucketName)
.build();
// 버킷이 생성되기까지 대기
WaiterResponse<HeadBucketResponse> waiterResponse = s3Waiter.waitUntilBucketExists(bucketRequestWait);
waiterResponse.matched().response().ifPresent(System.out::println);
System.out.println(bucketName +" has been created.");
} catch (S3Exception e) {
System.err.println(e.awsErrorDetails().errorMessage());
System.exit(1);
}
s3Client.close();
}
}output 예시는 다음과 같습니다.
Bucket [test-bucket] has been created.오브젝트가 모두 삭제된 빈 버킷에 대해서만 삭제가 가능합니다.
package cafe24.demo;
import java.net.URI;
import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.DeleteBucketRequest;
import software.amazon.awssdk.services.s3.model.DeleteObjectRequest;
import software.amazon.awssdk.services.s3.model.ListObjectsV2Request;
import software.amazon.awssdk.services.s3.model.ListObjectsV2Response;
import software.amazon.awssdk.services.s3.model.S3Exception;
import software.amazon.awssdk.services.s3.model.S3Object;
public class bucket_delete {
public static void main(String[] args) {
final String endpoint_url = "https://kr.cafe24obs.com";
final String region_name = "kr1";
Region newRegion = Region.of(region_name);
ProfileCredentialsProvider credentialsProvider = ProfileCredentialsProvider.create();
String bucketName = "test-bucket";
S3Client s3Client = S3Client.builder()
.region(newRegion)
.endpointOverride(URI.create(endpoint_url))
.credentialsProvider(credentialsProvider)
.build();
try {
// 버킷 삭제를 위해 버킷에 있는 모든 오브젝트 삭제
ListObjectsV2Request listObjectsV2Request = ListObjectsV2Request.builder()
.bucket(bucketName)
.build();
ListObjectsV2Response listObjectsV2Response;
do {
listObjectsV2Response = s3Client.listObjectsV2(listObjectsV2Request);
for (S3Object s3Object : listObjectsV2Response.contents()) {
DeleteObjectRequest request = DeleteObjectRequest.builder()
.bucket(bucketName)
.key(s3Object.key())
.build();
s3Client.deleteObject(request);
}
} while (listObjectsV2Response.isTruncated());
System.out.println("All objects in the bucket are deleted.");
// 비어 있는 버킷 삭제
DeleteBucketRequest deleteBucketRequest = DeleteBucketRequest.builder().bucket(bucketName).build();
s3Client.deleteBucket(deleteBucketRequest);
System.out.println("Bucket ["+bucketName+"] has been deleted.");
} catch (S3Exception e) {
System.err.println(e.awsErrorDetails().errorMessage());
System.exit(1);
}
}
}output 예시는 다음과 같습니다.
All objects in the bucket are deleted.
Bucket [test-bucket] has been deleted.존재하는 모든 버킷을 조회합니다.
package cafe24.demo;
import java.net.URI;
import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.ListBucketsRequest;
import software.amazon.awssdk.services.s3.model.ListBucketsResponse;
public class bucket_list {
public static void main(String[] args) {
final String endpoint_url = "https://kr.cafe24obs.com";
final String region_name = "kr1";
Region newRegion = Region.of(region_name);
ProfileCredentialsProvider credentialsProvider = ProfileCredentialsProvider.create();
S3Client s3Client = S3Client.builder()
.region(newRegion)
.endpointOverride(URI.create(endpoint_url))
.credentialsProvider(credentialsProvider)
.build();
System.out.println("--Existing buckets--");
ListBucketsRequest listBucketsRequest = ListBucketsRequest.builder().build();
ListBucketsResponse listBucketsResponse = s3Client.listBuckets(listBucketsRequest);
listBucketsResponse.buckets().stream().forEach(x -> System.out.println("Name : " +x.name()+ " CreationDate : " + x.creationDate()));
s3Client.close();
}
}output 예시는 다음과 같습니다.
--Existing buckets--
Name : test-bucket CreationDate : 2022-12-30T01:44:29.104Z
Name : test-bucket1 CreationDate : 2022-12-29T06:04:09.457Z
Name : test-bucket2 CreationDate : 2022-12-29T06:04:16.613Z로컬에 있는 파일을 특정 버킷에 업로드합니다.
파일 업로드 시에 파일의 contentType은 기본으로 binary/octet-stream으로 지정됩니다.
특정 타입으로 업로드 하기 위해서는 PutObjectRequest 객체에 contentType 정보를 담아야 합니다.
package cafe24.demo;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URI;
import java.nio.file.Paths;
import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
import software.amazon.awssdk.awscore.exception.AwsServiceException;
import software.amazon.awssdk.core.exception.SdkClientException;
import software.amazon.awssdk.core.sync.RequestBody;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.PutObjectRequest;
import software.amazon.awssdk.services.s3.model.PutObjectResponse;
import software.amazon.awssdk.services.s3.model.S3Exception;
public class object_upload {
public static void main(String[] args) throws S3Exception, AwsServiceException, SdkClientException, IOException {
final String endpoint_url = "https://kr.cafe24obs.com";
final String region_name = "kr1";
Region newRegion = Region.of(region_name);
ProfileCredentialsProvider credentialsProvider = ProfileCredentialsProvider.create();
String bucketName = "test-bucket";
//업로드할 파일의 로컬 경로
String filePath = "demo\\src\\main\\java\\cafe24\\demo\\files\\test-file.txt";
String keyName = Paths.get(filePath).getFileName().toString();
//업로드할 파일의 contentType 지정
String contentType = "text/plain";
S3Client s3Client = S3Client.builder()
.region(newRegion)
.endpointOverride(URI.create(endpoint_url))
.credentialsProvider(credentialsProvider)
.build();
PutObjectRequest objectRequest = PutObjectRequest.builder()
.bucket(bucketName)
.contentType(contentType)
.key(keyName)
.build();
PutObjectResponse response = s3Client.putObject(objectRequest, RequestBody.fromBytes(getObjectFile(filePath)));
System.out.println(response);
System.out.println("Object ["+keyName+"] has been uploaded to the bucket ["+bucketName+"].");
}
private static byte[] getObjectFile(String filePath) {
FileInputStream fileInputStream = null;
byte[] bytesArray = null;
try {
File file = new File(filePath);
bytesArray = new byte[(int) file.length()];
fileInputStream = new FileInputStream(file);
fileInputStream.read(bytesArray);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fileInputStream != null) {
try {
fileInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return bytesArray;
}
}output 예시는 다음과 같습니다.
PutObjectResponse(ETag="056f5ca5dbd6a49717737a6e4ede4f78")
Object [test-file.txt] has been uploaded to the bucket [test-bucket].버킷에 있는 파일을 로컬의 특정 경로로 다운로드합니다.
다운받으려는 경로에 동일한 이름의 파일이 있으면 다운로드 실패합니다.
package cafe24.demo;
import java.io.IOException;
import java.net.URI;
import java.nio.file.Path;
import java.nio.file.Paths;
import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
import software.amazon.awssdk.awscore.exception.AwsServiceException;
import software.amazon.awssdk.core.exception.SdkClientException;
import software.amazon.awssdk.core.sync.ResponseTransformer;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.GetObjectRequest;
import software.amazon.awssdk.services.s3.model.S3Exception;
public class object_download {
public static void main(String[] args) throws S3Exception, AwsServiceException, SdkClientException, IOException {
final String endpoint_url = "https://kr.cafe24obs.com";
final String region_name = "kr1";
Region newRegion = Region.of(region_name);
ProfileCredentialsProvider credentialsProvider = ProfileCredentialsProvider.create();
String bucketName = "test-bucket";
String keyName = "test-file.txt";
//오브젝트를 다운로드할 경로
Path destination = Paths.get("demo\\src\\main\\java\\cafe24\\demo\\files\\downloaded-file.txt");
S3Client s3Client = S3Client.builder()
.region(newRegion)
.endpointOverride(URI.create(endpoint_url))
.credentialsProvider(credentialsProvider)
.build();
GetObjectRequest getObjectRequest = GetObjectRequest.builder()
.bucket(bucketName)
.key(keyName)
.build();
s3Client.getObject(getObjectRequest, ResponseTransformer.toFile(destination));
System.out.println("Object has been downloaded to local. \n Downloaded Path : ["+destination+"]");
}
}output 예시는 다음과 같습니다.
Object has been downloaded to local.
Downloaded Path : [demo\src\main\java\cafe24\demo\files\downloaded-file.txt]버킷에 있는 모든 파일과 폴더를 조회합니다.
package cafe24.demo;
import java.net.URI;
import java.util.List;
import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.ListObjectsRequest;
import software.amazon.awssdk.services.s3.model.ListObjectsResponse;
import software.amazon.awssdk.services.s3.model.S3Exception;
import software.amazon.awssdk.services.s3.model.S3Object;
public class object_get_list {
public static void main(String[] args) {
final String endpoint_url = "https://kr.cafe24obs.com";
final String region_name = "kr1";
String bucketName = "test-bucket";
Region newRegion = Region.of(region_name);
ProfileCredentialsProvider credentialsProvider = ProfileCredentialsProvider.create();
S3Client s3Client = S3Client.builder()
.region(newRegion)
.endpointOverride(URI.create(endpoint_url))
.credentialsProvider(credentialsProvider)
.build();
System.out.println("Get list of all objects in the bucket.");
try {
ListObjectsRequest listObjects = ListObjectsRequest
.builder()
.bucket(bucketName)
.build();
ListObjectsResponse res = s3Client.listObjects(listObjects);
List<S3Object> objects = res.contents();
if (objects == null || objects.isEmpty()) {
System.out.println("The bucket is empty.");
return;
}
for (S3Object value : objects) {
System.out.print("\n Name : " + value.key() + "\tSize : " + calKb(value.size()) + "KBs\tOwner ID : "
+ value.owner().id());
}
} catch (S3Exception e) {
System.err.println(e.awsErrorDetails().errorMessage());
System.exit(1);
}
s3Client.close();
}
// bytes를 kbs로 변환
private static long calKb(Long val) {
return val / 1024;
}
}output 예시는 다음과 같습니다.
Get list of all objects in the bucket.
Name : folder/ Size : 0KBs Owner ID : clouduser
Name : folder/test-file-04 Size : 4KBs Owner ID : clouduser
Name : folder/test-file-05 Size : 4KBs Owner ID : clouduser
Name : folder/test-file-06 Size : 4KBs Owner ID : clouduser
Name : test-file-01 Size : 4KBs Owner ID : clouduser
Name : test-file-02 Size : 4KBs Owner ID : clouduser
Name : test-file-03 Size : 4KBs Owner ID : clouduser특정 버킷에 있는 파일을 삭제합니다.
package cafe24.demo;
import java.net.URI;
import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.DeleteObjectRequest;
public class object_delete {
public static void main(String[] args) {
final String endpoint_url = "https://kr.cafe24obs.com";
final String region_name = "kr1";
Region newRegion = Region.of(region_name);
ProfileCredentialsProvider credentialsProvider = ProfileCredentialsProvider.create();
String bucketName = "test-bucket";
String fileName = "test-file.txt";
S3Client s3Client = S3Client.builder()
.region(newRegion)
.endpointOverride(URI.create(endpoint_url))
.credentialsProvider(credentialsProvider)
.build();
DeleteObjectRequest deleteObjectRequest = DeleteObjectRequest.builder()
.bucket(bucketName)
.key(fileName)
.build();
s3Client.deleteObject(deleteObjectRequest);
System.out.println("Object ["+fileName+"] has been deleted from the bucket.");
}
}output 예시는 다음과 같습니다.
Object [test-file.txt] has been deleted from the bucket.파일을 다른 버킷으로 복사합니다.
package cafe24.demo;
import java.net.URI;
import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.CopyObjectRequest;
import software.amazon.awssdk.services.s3.model.CopyObjectResponse;
import software.amazon.awssdk.services.s3.model.S3Exception;
public class object_copy {
public static void main(String[] args) {
final String endpoint_url = "https://kr.cafe24obs.com";
final String region_name = "kr1";
Region newRegion = Region.of(region_name);
ProfileCredentialsProvider credentialsProvider = ProfileCredentialsProvider.create();
// 복사하려는 오브젝트의 이름
String objectKey = "bucket1-file.txt";
// 복사하려는 오브젝트가 위치한 버킷
String fromBucket = "test-bucket1";
// 붙여넣기 할 버킷
String toBucket = "test-bucket";
S3Client s3Client = S3Client.builder()
.region(newRegion)
.endpointOverride(URI.create(endpoint_url))
.credentialsProvider(credentialsProvider)
.build();
CopyObjectRequest copyReq = CopyObjectRequest.builder()
.sourceKey(objectKey)
.sourceBucket(fromBucket)
.destinationBucket(toBucket)
.destinationKey(objectKey)
.build();
try {
CopyObjectResponse copyRes = s3Client.copyObject(copyReq);
System.out.println("Copying object ["+objectKey+"] from ["+fromBucket+"] to ["+toBucket+"] has been completed");
System.out.println(copyRes.copyObjectResult().toString());
} catch (S3Exception e) {
System.err.println(e.awsErrorDetails().errorMessage());
System.exit(1);
}
}
}output 예시는 다음과 같습니다.
Copying object [bucket1-file.txt] from [test-bucket1] to [test-bucket] has been completed
CopyObjectResult(ETag=d9ebe4d6aeb33dea41ddb2b57e7b6d80, LastModified=2023-01-03T18:05:31.688Z)AWS Java SDK version : 2.17.230
Java version : 11.0.11