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1AmazonS3, how to check if the upload succeeded?
2String bucket = "mybucket.example.com";
3    String fileName = "2011/test/test.pdf";
4    AmazonS3 client = new AmazonS3Client(new BasicAWSCredentials(
5        "accessKey", "secretKey"));
6    byte[] contents = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
7    InputStream stream = new ByteArrayInputStream(contents);
8    ObjectMetadata meta = new ObjectMetadata();
9    meta.setContentLength(contents.length);
10    meta.setContentType("application/pdf");
11    PutObjectResult res = client.putObject(bucket, fileName, stream, meta);
12    client.setObjectAcl(bucket, fileName, CannedAccessControlList.PublicRead);