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So - I've got a third party library that needs a File as input. I've got a byte array.
I don't want to write the bytes to disk .. I'd like to keep this in memory. Any idea on how I can create a File from the provided byte array (without writing to disk)?
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Java – How to save byte[] to a file write is the simplest solution to save byte[] to a file. // bytes = byte[] Path path = Paths. get("/path/file"); Files. write(path, bytes);
Use the default CommonsMultipartFile where you to use the FileDiskItem object to create it. Example: FileItem fileItem = new DiskFileItem("fileData", "application/pdf",true, outputFile. getName(), 100000000, new java.
But...if you have a byte array and that is all, it doesn't have a filename - those are only available within the operating system file system for actual files, and a byte array does not have any file associated with it, even if it was read from or has been written to a file.
Java ByteArrayOutputStream class is used to write common data into multiple files. In this stream, the data is written into a byte array which can be written to multiple streams later. The ByteArrayOutputStream holds a copy of data and forwards it to multiple streams.
Sorry, not possible. A File is inherently an on-disk entity, unless you have a RAM disk - but that's not something you can create in Java.
That's exactly the reason why APIs should not be based on File objects (or be overloaded to accept an InputStream).
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