[Spring] Uploading String to Amazon S3

# JAVA String to ByteArrayOutputStream

DataOutputStream 파라미터에 String ByteArray 값을 넣어주고, byteArrayOutputStream이 가지고 있는 ByteArray값을 리턴한다

public byte[] getByteArray(String data) {


ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(byteArrayOutputStream);
try {
out.write(data.getBytes());
byteArrayOutputStream.flush();
byteArrayOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
return byteArrayOutputStream.toByteArray();
}

참고

https://gist.github.com/kykkyn2/052382599134adf504abfa096282b816

# uploading file to Amazon S3 (S3에 파일 업로드, S3Helper)

입력받은 byteArray값을 ByteArrayInputStream으로 변환한 뒤 저장한다

import com.amazonaws.services.s3.AmazonS3;
public PutObjectResult putObject(
byte[] bytes,
Buckets buckets,
String key, 
String fileContentType,
CannedAccessControlList cannedAccessControlList
) {
ObjectMetadata objectMetadata = new ObjectMetadata();
objectMetadata.setContentType(fileContentType);
PutObjectRequest putObjectRequest = new PutObjectRequest(
buckets.getBucketName(),
key,
byteArrayToFileInputStream(bytes),
objectMetadata
);
putObjectRequest.withCannedAcl(cannedAccessControlList);
return amazonS3.putObject(putObjectRequest);
}


private InputStream byteArrayToFileInputStream(byte[] bytes) {
return new ByteArrayInputStream(bytes);
}

# Uploading String to Amazon S3

저장할 String 문자열을 위의 코드들을 이용해 변환한 뒤 text file로 S3에 저장하게 된다

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(byteArrayOutputStream);


String word = "kkuma"
try {
out.write(word.getBytes());
byteArrayOutputStream.close();
} catch (IOException e) {

e.printStackTrace();
}
byte[] bytes = byteArrayOutputStream.toByteArray();
s3Helper.putObject(
bytes,
Buckets.TEST, // Bucket
test", // key
“txt/plain”, // fileContentType
CannedAccessControlList.PublicRead
);