Spring-boot MultipartFile issue with ByteArrayResource - spring

Question

I'm trying to implement a rest api consuming excel file. I'm using spring-boot and code is available here.
Code works fine when using FileSystemResource for payload. But i'm not able to make the code work with ByteArrayResource in replacement of FileSystemResource:
RestApi.java:
#RestController
public class RestApi {
private static final Logger LOGGER = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
#PostMapping("/api/upload")
public ResponseEntity<?> uploadFile(#RequestParam("file") MultipartFile uploadfile) {
LOGGER.debug("Single file upload!");
try {
LOGGER.info("\n\n ****** File name: {}, type {}! ************", uploadfile.getOriginalFilename(), uploadfile.getContentType());
this.processExcelFile(uploadfile.getInputStream());
} catch (Exception e) {
return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
}
return new ResponseEntity<>("Successfully uploaded - " + uploadfile.getOriginalFilename(), new HttpHeaders(), HttpStatus.OK);
}
private List<String> processExcelFile(InputStream stream) throws Exception {
List<String> result = new ArrayList<String>();
//Create Workbook instance holding reference to .xlsx file
try(XSSFWorkbook workbook = new XSSFWorkbook(stream);) {
//Get first/desired sheet from the workbook
XSSFSheet sheet = workbook.getSheetAt(0);
//Iterate through each rows one by one
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext()) {
Row row = rowIterator.next();
String cellValue = row.getCell(0).getRichStringCellValue().toString();
result.add(cellValue);
LOGGER.info("\n\n ****** Cell value: {} ************", cellValue);
}
return result;
}
}
}
RestApiTest:
#RunWith(SpringRunner.class)
#SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
public class RestApiTest {
#Autowired
private TestRestTemplate restTemplate;
#Autowired
private ResourceLoader loader;
#Test
public void testUploadFile() throws Exception {
Resource resource = this.loader.getResource("classpath:test.xlsx");
MultiValueMap<String, Object> parts = new LinkedMultiValueMap<>();
// parts.add("file", new FileSystemResource(resource.getFile()));
parts.add("file", new ByteArrayResource(IOUtils.toByteArray(resource.getInputStream())));
String response = this.restTemplate.postForObject("/api/upload", parts, String.class);
Assertions.assertThat(response).containsIgnoringCase("success");
}
}
I'm getting following error when running test:
java.lang.AssertionError:
Expecting:
<"{"timestamp":1487852597527,"status":400,"error":"Bad Request","exception":"org.springframework.web.multipart.support.MissingServletRequestPartException","message":"Required request part 'file' is not present","path":"/api/upload"}">
to contain:
<"success">
(ignoring case)
Any idea?

Answer 1

when using loader.getResource(...) you must use resource itself as answered above. So you don't need ByteArrayResource. I got this problem, but I'm not using resource from classpath. So if someone really need to use ByteArrayResource, here is my workaround
public class FileNameAwareByteArrayResource extends ByteArrayResource {
private String fileName;
public FileNameAwareByteArrayResource(String fileName, byte[] byteArray, String description) {
super(byteArray, description);
this.fileName = fileName;
}
#Override
public String getFilename() {
return fileName;
}
}
and then use it
parts.add("file", new FileNameAwareByteArrayResource("filename", byteArray));