Java convert file to multipartfile

import java.util.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class Lautturi {

	public static void main(String[] args) throws IOException {

		File file = new File("src/test/resources/input.txt");
		FileInputStream input = new FileInputStream(file);
		MultipartFile multipartFile = new MockMultipartFile("file",
		            file.getName(), "text/plain", IOUtils.toByteArray(input));

	}
}