public class FileUpload {
    private MultipartFile file;
//setter and getter
}

@RequestMapping(value = "/fileUploadAction", method = RequestMethod.POST)
public String fileUploadAction(FileUpload fileUpload, HttpServletRequest servletRequest) {
    MultipartFile multipartFile = fileUpload.getFile();
     String filename = multipartFile.getOriginalFilename();
     String filePath=servletRequest.getServletContext().getRealPath("/WEB-INF/file")+filename;
     File imageFile = new File(filePath);
     try {
     multipartFile.transferTo(imageFile);
     } catch (IllegalStateException | IOException e) {
     e.printStackTrace();
     }
    return "fileUpload";
}

<bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
</bean>

<form
    action="<c:url value='/fileUploadAction?${_csrf.parameterName}=${_csrf.token}' />"
    method="post" enctype="multipart/form-data">
    <input id="file" name="file" class="input-file" type="file">
    <button id="button" name="button" class="btn btn-primary">Button</button>
</form>