尝试将文件上传到 Amazon S3 时返回错误代码 400

Question

I am a newbie to AWS and right now I am trying to write a standalone Java application to upload a PDF to AWS S3. However, error: 400 is returned.

Can anybody give me some general directions on how to troubleshoot this error?

public class App {

private static String PDF_PATH = "/tmp/pdf-test.pdf";

public static void main(String[] args) throws IOException {

    // prepare AWS credential
    BasicAWSCredentials awsCreds = new BasicAWSCredentials("xxx",
            "yyy");
    AmazonS3 s3Client = AmazonS3ClientBuilder.standard().withRegion("aaa")
            .withCredentials(new AWSStaticCredentialsProvider(awsCreds)).build();

    // upload a test PDF
    byte[] pdfDoc = Files.readAllBytes((new File(PDF_PATH)).toPath());
    PutObjectRequest request = new PutObjectRequest("aaa", "bbb",
            new String(Base64.getEncoder().encode(pdfDoc)));
    ObjectMetadata metadata = new ObjectMetadata();
    metadata.setContentType("application/pdf");
    metadata.setContentLength(pdfDoc.length);
    request.setMetadata(metadata);
    s3Client.putObject(request);
}

}

Answer 1

To expand on what @AlexGoja said, there are three constructors for a PutObjectRequest . One of them takes three Strings. However, the third string parameter is not a Base64 encoded file. I'm not sure where you got that. You want to use the constructor that takes a File to upload the file:

public class App {

private static String PDF_PATH = "/tmp/pdf-test.pdf";

public static void main(String[] args) throws IOException {

    // prepare AWS credential
    BasicAWSCredentials awsCreds = new BasicAWSCredentials("xxx",
            "yyy");
    AmazonS3 s3Client = AmazonS3ClientBuilder.standard().withRegion("aaa")
            .withCredentials(new AWSStaticCredentialsProvider(awsCreds)).build();

    // upload a test PDF
    File pdfFile = new File(PDF_PATH);
    PutObjectRequest request = new PutObjectRequest("aaa", "bbb", pdfFile );
    ObjectMetadata metadata = new ObjectMetadata();
    metadata.setContentType("application/pdf");
    metadata.setContentLength(pdfFile.length());
    request.setMetadata(metadata);
    s3Client.putObject(request);
}

}