How to copy a MultipartFile in Spring?

Question

In my method I have a MultipartFile (instance of StreamingMultipartFile) ( org.springframework.web.multipart.MultipartFile ) passed as an argument.

Inside this method I need to get a copy of the file, as its InputStream is to be read by another method and the file is to be passed itself after that. I tried to reset the InputStream of the file but it doesn't work.

Also I tried to use GSON library and SerializationUtils methods from org.springframework.util package to serialize/deserialize but it doesn't succeeded as the class doesn't have no-args constructor.

So how the copy of such file can be obtained at all?

Answer 1

I have found next solution - create custom class with next fields:

private final byte[] fileContent;
private final String fileName;

Also the class should implement the MultipartFile interface and override all methods based on specified fields accordingly.