How to write a string to Amazon S3 bucket?

Question

How can I add a string as a file on amazon s3? From whaterver I searched, I got to know that we can upload a file to s3. What is the best way to upload data without creating

Answer 1

If you're using java, check out https://ivan-site.com/2015/11/interact-with-s3-without-temp-files/

import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.GetObjectRequest;
import com.amazonaws.services.s3.model.ObjectMetadata;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.S3Object;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.*;
import java.nio.charset.StandardCharsets;

class S3StreamJacksonTest {
    private static final String S3_BUCKET_NAME = "bucket";
    private static final String S3_KEY_NAME = "key";
    private static final String CONTENT_TYPE = "application/json";

    private static final AmazonS3 AMAZON_S3 = new AmazonS3Client();
    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
    private static final TestObject TEST_OBJECT = new TestObject("test", 123, 456L);

    public void testUploadWithStream() throws JsonProcessingException {
        String fileContentString = OBJECT_MAPPER.writeValueAsString(TEST_OBJECT);
        byte[] fileContentBytes = fileContentString.getBytes(StandardCharsets.UTF_8);
        InputStream fileInputStream = new ByteArrayInputStream(fileContentBytes);
        ObjectMetadata metadata = new ObjectMetadata();
        metadata.setContentType(CONTENT_TYPE);
        metadata.setContentLength(fileContentBytes.length);
        PutObjectRequest putObjectRequest = new PutObjectRequest(
                S3_BUCKET_NAME, S3_KEY_NAME, fileInputStream, metadata);
        AMAZON_S3.putObject(putObjectRequest);
    }
}