How bind list of objects from Multipart param to objectMapper?

Question

My api receives a param MultipartFile. I am unable to bind that file with a list of objects?

I work on Spring-boot 2.0.8 with Java 8

I tried this:

public ResponseEntity<Long> addReferenceByFile(HttpServletRequest request,
                                               @PathVariable String numeroLicence,                                                     
@RequestParam("references") MultipartFile references) throws URISyntaxException {

and this:

try {
     InputStream inputStream = references.getInputStream();
     ObjectMapper objectMapper = new ObjectMapper();
     ArrayList<Reference> references1 = objectMapper.readValues(references, Reference.class);
    } catch (IOException e) {
        e.printStackTrace();
    }

ObjectMapper doesn't accept InputStream data. My requirement is to get a list to use for unitary treatment.

Would someone help me find a solution for this issue?

Hope this will be useful: https://stackoverflow.com/a/30043173/2987755 — dkb, Apr 08 '19 at 09:06
I understand but no, I don' want my customer send the file, and the content file in two parameters — user1450740, Apr 08 '19 at 09:14

score 0 · Answer 1 · answered Apr 08 '19 at 09:32

0

You can use InputStreamReader to read the multipart InputStream:

try (InputStream in = references.getInputStream()) {
    objectMapper.readValue(new InputStreamReader(in), Reference.class);
}

answered Apr 08 '19 at 09:32

Karol Dowbecki

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It's missing something no? in which and type of variable I get the result? – user1450740 Apr 08 '19 at 12:17
You need to assign `readValue()` method return to something. You haven't shown what is your payload and expected result type so there is no way to guess. – Karol Dowbecki Apr 08 '19 at 12:18
Yes I know, I want to have : ArrayList – user1450740 Apr 08 '19 at 12:20

score 0 · Answer 2 · answered Apr 08 '19 at 14:02

I found the solution :

ObjectMapper objectMapper = new ObjectMapper().registerModule(new JavaTimeModule());
    try {
        TypeFactory typeFactory = objectMapper.getTypeFactory();
        CollectionType collectionType = typeFactory.constructCollectionType(
            List.class, Reference.class);
        List<Reference> referenceList = objectMapper.readValue(references.getInputStream(), collectionType);



    } catch (IOException e) {
        throw new CustomException(CustomError.ERROR_REFERENCE_FILE_BAD_FORMAT);
    }

How bind list of objects from Multipart param to objectMapper?

2 Answers2