将CSV文件写入MultipartFile

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-csv</artifactId>
    <version>1.5</version>
</dependency>

将CSV写入 ByteArrayOutputStream

final ByteArrayOutputStream out = new ByteArrayOutputStream();
final CSVFormat format = CSVFormat.DEFAULT;
final CSVPrinter csvPrinter;
try {
  csvPrinter = new CSVPrinter(new PrintWriter(out), format);
  csvPrinter.printRecord("12,ABC,XYZ");
  csvPrinter.printRecord("13,LMN,PQR");
  csvPrinter.flush();
  csvPrinter.close();
} catch (IOException e) {
  e.printStackTrace();
}

ResponseEntity<ObjectResponseBo> uploadFile(@RequestHeader("Authorization") String var1, @RequestParam("file") MultipartFile var2);

如何转换 ByteArrayOutputStream公司 MultipartFile 对象,这样我就可以在我的外呼中使用csv文件了?