Java Convert FilePart to byte[] in Springboot using Webflux

Question

I want to get the byte content of the File. Here is my controller:

@PostMapping("/files") @ResponseStatus(HttpStatus.OK) public List<UserFilesResponse> uploadFile(@RequestPart("file") FilePart file) { // I want to get the bytes[] content of my file. How can I do it please ?? }

You can use content for that? However what do you want to do with the byte[]? If to store it somewhere use one of the transferTo methods. — M. Deinum
– M. Deinum, Commented Jun 21, 2021 at 12:11
Thanks for the note. I want the byte[] because I save to Google Cloud Storage and I do it this way: storage.create(blobInfo, <byte[]>); So I can get the blobinfo, I need to have the byte[] to store the Data to GCloud Storage. Thanks — user3648235
– user3648235, Commented Jun 21, 2021 at 13:48
You should use the content then and read the DataBuffer. — M. Deinum
– M. Deinum, Commented Jun 22, 2021 at 5:54

Andrey Novikov · Accepted Answer · 2021-11-23 21:18:40Z

4

As M. Deinum mentioned, you should use content

I would also recommend https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/core/io/buffer/DataBufferUtils.html#join-org.reactivestreams.Publisher-

DataBufferUtils.join(filePart.content()) .map(dataBuffer -> dataBuffer.asByteBuffer().array())

answered Nov 23, 2021 at 21:18

Andrey Novikov

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2 Comments

stackMan10 Over a year ago

Is it a good idea to convert it to a byte array and then storing it in the database?

Andrey Novikov Over a year ago

well, the question was about getting bytes from FilePart. The decision of storing byte array in DB or FS or any cloud should depend on your business-process. It's a topic for a separate question :)

Sagir · Accepted Answer · 2022-03-02 05:06:43Z

Convert filepart to Byte Array

private byte[] convertFilePartToByteArray(FilePart file) throws IOException { File convFile = new File(file.filename()); file.transferTo(convFile); return Files.readAllBytes(convFile.toPath()); }

Deb Das · Accepted Answer · 2022-03-02 05:15:04Z

@ResponseStatus(HttpStatus.OK) public List<UserFilesResponse> uploadFile(@RequestPart("file") MultipartFile file) { byte[] fileBytes = file.getBytes(); //rest of code }

I would suggest to use multipart file instead of just file part, this will enable you to call the getBytes() method and get the byte array.

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