IS there a way to use the Android AWS SDK to read file context from Amazon S3 bucket without having to download the file?

Question

从文档中可以看到您可以下载文件，但是我想知道是否有一种方法可以从Amazon S3存储桶中获取文本文件的内容，而不必在本地存储文件？

Answer 1

Yes, you can use getObject() on an instance of AmazonS3 to download a file:

String bucketName = "BUCKET_NAME";
String key = "KEY_OF_OBJECT";

AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                    .withRegion(Regions.DEFAULT_REGION)
                    .withCredentials(new ProfileCredentialsProvider())
                    .build();

System.out.println("Downloading an object");
S3Object fullObject = s3Client.getObject(new GetObjectRequest(bucketName, key));
System.out.println("Content-Type: " + fullObject.getObjectMetadata().getContentType());
System.out.println("Content: ");

// fullObject.getObjectContent() is an InputStream 

BufferedReader reader = new BufferedReader(new InputStreamReader(fullObject.getObjectContent()));
String line = null;
while ((line = reader.readLine()) != null) {
    System.out.println(line);
}

If you only need part of the data, you can use the withRange() modifier on GetObjectRequest() to create a range request.