Resttemplate form/multipart: image + JSON in POST

Question

I\'m trying to call a rest ws (using resttemplate), that accepts an image and some JSON. However, I don\'t seem to be able to get it running.

The relevant code is as fol

Answer 1

If you want to use ByteArrayResource, simply register a ResourceHttpMessageConverter.

If you want to use a byte[], simply register a ByteArrayHttpMessageConverter.

The content type of the image part should be an image type, like image/png, not application/json.

You can set each individual part's data type with

HttpHeaders partHeaders = new HttpHeaders();
partHeaders.setContentType(MediaType.IMAGE_PNG);
HttpEntity<ByteArrayResource> bytesPart = new HttpEntity<ByteArrayResource>(bytes, partHeaders);

map.add("file", bytesPart);

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Create your RestTemplate by providing your collection of HttpMessageConverters

HttpMessageConverter<Object> jackson = new MappingJackson2HttpMessageConverter();
HttpMessageConverter<Resource> resource = new ResourceHttpMessageConverter();
FormHttpMessageConverter formHttpMessageConverter = new FormHttpMessageConverter();
formHttpMessageConverter.addPartConverter(jackson);
formHttpMessageConverter.addPartConverter(resource); // This is hope driven programming

RestTemplate restTemplate = new RestTemplate(Arrays.asList(jackson, resource, formHttpMessageConverter));

and your outermost HttpEntity should have a multipart content type

header.setContentType(MediaType.MULTIPART_FORM_DATA);