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Uploading a file with Spring RestTemplate
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| @Service | |
| public class FileUploadService { | |
| private RestTemplate restTemplate; | |
| @Autowired | |
| public FileUploadService(RestTemplateBuilder builder) { | |
| this.restTemplate = builder.build(); | |
| } | |
| public void postFile(String filename, byte[] someByteArray) { | |
| HttpHeaders headers = new HttpHeaders(); | |
| headers.setContentType(MediaType.MULTIPART_FORM_DATA); | |
| // This nested HttpEntiy is important to create the correct | |
| // Content-Disposition entry with metadata "name" and "filename" | |
| MultiValueMap<String, String> fileMap = new LinkedMultiValueMap<>(); | |
| ContentDisposition contentDisposition = ContentDisposition | |
| .builder("form-data") | |
| .name("file") | |
| .filename(filename) | |
| .build(); | |
| fileMap.add(HttpHeaders.CONTENT_DISPOSITION, contentDisposition.toString()); | |
| HttpEntity<byte[]> fileEntity = new HttpEntity<>(someByteArray, fileMap); | |
| MultiValueMap<String, Object> body = new LinkedMultiValueMap<>(); | |
| body.add("file", fileEntity); | |
| HttpEntity<MultiValueMap<String, Object>> requestEntity = | |
| new HttpEntity<>(body, headers); | |
| try { | |
| ResponseEntity<String> response = restTemplate.exchange( | |
| "/urlToPostTo", | |
| HttpMethod.POST, | |
| requestEntity, | |
| String.class); | |
| } catch (HttpClientErrorException e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| } |
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