我正在尝试使用RestTemplate将图像(MultipartFile)上传到服务器URL。
来自邮递员的发送请求使用Content-Type: image/jpg
和从Body发送为二进制文件的图像。
SpringBoot中的方法实现:
public ResponseEntity<String> uploadImage(MultipartFile file) {
restTemplate.getMessageConverters().add(new ByteArrayHttpMessageConverter());
restTemplate.getMessageConverters().add(new BufferedImageHttpMessageConverter());
LinkedMultiValueMap<String,Object> params = new LinkedMultiValueMap<>();
params.add("file", new FileSystemResource(file));
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setContentType(MediaType.IMAGE_JPEG);
HttpEntity<LinkedMultiValueMap<String, Object>> requestEntity = new HttpEntity<>(params, httpHeaders);
return restTemplate.exchange(UPLOAD_URL, HttpMethod.POST, requestEntity, String.class);
例外:
org.springframework.web.client.RestClientException: Could not write request: no suitable HttpMessageConverter found for request type [org.springframework.util.LinkedMultiValueMap] and content type [image/jpeg]
上传适用于Content-Type MediaType.MULTIPART_FORM_DATA
,但我使用的REST服务只接受image/jpg
作为HTTP Content-Type。
感谢。
答案 0 :(得分:0)
您的远程服务接受image/jpg
,因此您应该流传输字节而不是多部分内容:
HttpHeaders headers = new HttpHeaders();
headers.set("Content-Type", "image/jpeg");
Resource res = new InputStreamResource(file.getInputStream());
HttpEntity<Resource> entity = new HttpEntity<>(res, headers);
template.exchange(UPLOAD_URL, HttpMethod.POST, entity , String.class);
RestTemplate
具有ResourceHttpMessageConverter
,可将您的多部分内容流式传输给您的服务。