How to upload byte array to S3 bucket in Java? - spring-boot

Question

In a spring boot application I read an image file from a remote service, which returns byte array and in headers I can check what is file extension:
ResponseEntity<byte[]> result = restTemplate.exchange(url, HttpMethod.GET, entity, byte[].class);
Now I want to put this byte array in a S3 bucket in a folder which I decide during run time, for example folder name can base don current timestamp.
I checked AmazonS3 class, but it doesnt seem to have any such API which can help me?
How can this be done?

Answer 1

As per example from documentation:
https://docs.aws.amazon.com/sdk-for-java/v2/developer-guide/examples-s3-objects.html#upload-object
// Put Object. here 'bytes' is byte array.
PutObjectResponse response = s3.putObject(PutObjectRequest.builder().bucket(bucketName).key(filePathLocation).build(),RequestBody.fromBytes(bytes));

Answer 2

You can use the MinIO java S3 client. Here you can find the documentation.
The code will look something like the following one:
MinioClient minioClient =
MinioClient.builder()
.endpoint("https://play.min.io")
.credentials("Q3AM3UQ867SPQQA43P2F", "zuf+tfteSlswRu7BJ86wekitnifILbZam1KYY3TG")
.build();
StringBuilder builder = new StringBuilder();
for (int i = 0; i < 1000; i++) {
builder.append(
"Sphinx of black quartz, judge my vow: Used by Adobe InDesign to display font samples. ");
builder.append("(29 letters)\n");
builder.append(
"Jackdaws love my big sphinx of quartz: Similarly, used by Windows XP for some fonts. ");
builder.append("(31 letters)\n");
builder.append(
"Pack my box with five dozen liquor jugs: According to Wikipedia, this one is used on ");
builder.append("NASAs Space Shuttle. (32 letters)\n");
builder.append(
"The quick onyx goblin jumps over the lazy dwarf: Flavor text from an Unhinged Magic Card. ");
builder.append("(39 letters)\n");
builder.append(
"How razorback-jumping frogs can level six piqued gymnasts!: Not going to win any brevity ");
builder.append("awards at 49 letters long, but old-time Mac users may recognize it.\n");
builder.append(
"Cozy lummox gives smart squid who asks for job pen: A 41-letter tester sentence for Mac ");
builder.append("computers after System 7.\n");
builder.append(
"A few others we like: Amazingly few discotheques provide jukeboxes; Now fax quiz Jack! my ");
builder.append("brave ghost pled; Watch Jeopardy!, Alex Trebeks fun TV quiz game.\n");
builder.append("---\n");
// Create a InputStream for object upload.
ByteArrayInputStream bais = new ByteArrayInputStream(builder.toString().getBytes("UTF-8"));
// Create object 'my-objectname' in 'my-bucketname' with content from the input stream.
minioClient.putObject(
PutObjectArgs.builder().bucket("my-bucketname").object("my-objectname").stream(
bais, bais.available(), -1)
.build());
bais.close();
System.out.println("my-objectname is uploaded successfully");
The full code can be found here.

Answer 3

Checkout the AWS JAVA SDK:
Here the getting started section:
https://docs.aws.amazon.com/sdk-for-java/v2/developer-guide/getting-started.html
In order to use in Spring context use the Maven dependency:
https://docs.aws.amazon.com/sdk-for-java/v2/developer-guide/setup-project-maven.html
Uploading an object to S3 Bucket:
https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/examples-s3-objects.html#upload-object
import com.amazonaws.AmazonServiceException;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
System.out.format("Uploading %s to S3 bucket %s...\n", file_path, bucket_name);
final AmazonS3 s3 = AmazonS3ClientBuilder.standard().withRegion(Regions.DEFAULT_REGION).build();
try {
s3.putObject(bucket_name, key_name, new File(file_path));
} catch (AmazonServiceException e) {
System.err.println(e.getErrorMessage());
System.exit(1);