File文件转为MultipartFile文件

private MultipartFile getMultipartFile(File file){
FileInputStream fileInputStream = null;
MultipartFile multipartFile = null;
try {
fileInputStream = new FileInputStream(file);
multipartFile = new MockMultipartFile(file.getName(),file.getName(),
ContentType.APPLICATION_OCTET_STREAM.toString(),fileInputStream);
} catch (Exception e) {
e.printStackTrace();
}
return multipartFile;
}