如何在Java中将appendblob/大于4MB限制的文件上传到Azure storage/blob中？

Question

然而，库似乎不能为AppendBlob做同样的事情，那么如何手动完成这个分块呢？基本上，我认为这需要将InputStream分成更小的批...

使用Azure Java SDK 12.14.1

Answer 1

受以下SO中的答案启发（与在C#中这样做有关）:c-sharp-azure-appendblob-appendblock-adding-a-file-larger-the-4MB-limit

...我在Java中是这样做的：

    AppendBlobRequestConditions appendBlobRequestConditions = new AppendBlobRequestConditions()
            .setLeaseId("myLeaseId");
    
    try (InputStream input = new BufferedInputStream(
            new FileInputStream(file));) {
        byte[] buf = new byte[AppendBlobClient.MAX_APPEND_BLOCK_BYTES];
        int bytesRead;
        while ((bytesRead = input.read(buf)) > 0) {
            if (bytesRead != buf.length) {
                byte[] smallerData = new byte[bytesRead];
                smallerData = Arrays.copyOf(buf, bytesRead);
                buf = smallerData;
            }
            try (InputStream byteStream = new ByteArrayInputStream(buf);) {
                appendBlobClient
                        .appendBlockWithResponse(byteStream, bytesRead,
                                null, appendBlobRequestConditions, null,
                                null);
            }
        }
    }

当然，在此之前您需要做很多事情，比如确保AppendBlob存在，如果不存在，则在尝试追加任何数据之前创建它。