在我的应用程序中，我从 API 回应中接收到一个档案，该档案Content-Type是application/octet-stream.

我正在尝试将此档案作为ResponseEntity<Resource>.

但我收到错误：

RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [class org.springframework.http.ResponseEntity] and content type [application/octet-stream]

通过浏览一些档案，我想到了使用responseEntityExtractor与RestTemplate.getForEntity相同的档案。

我的代码：

RequestCallback requestCallback = request -> {
HttpHeaders headers1 = request
        .getHeaders();
headers1.set("Authorization", "Bearer "   template.getAccessToken());
headers1
        .setAccept(Arrays.asList(MediaType.APPLICATION_OCTET_STREAM, MediaType.ALL));
};

ResponseExtractor<ResponseEntity<Resource>> responseExtractor = template.responseEntityExtractor(ResponseEntity.class);
template.execute(url, HttpMethod.GET, requestCallback, responseExtractor, uriVariables);

可以理解的是，通过setAccept在请求回呼中设定，我们让我们restTemplate知道期望什么型别的内容，responseEntityExtractor()并将回传ResponseExtractor<ResponseEntity<T>>。

我错过了什么？

uj5u.com热心网友回复：

代替：

ResponseExtractor<ResponseEntity<Resource>> responseExtractor = template.responseEntityExtractor(ResponseEntity.class);

试试这个byte[]在控制器方法中回传：

ResponseExtractor<ResponseEntity<byte[]>> responseExtractor = template.responseEntityExtractor(byte[].class);
ResponseEntity<byte[]> results = template.execute(url, HttpMethod.GET, requestCallback, responseExtractor, uriVariables);
return results.getBody();

或者这个回传ResponseEntity<Resource>：

ResponseExtractor<ResponseEntity<byte[]>> responseExtractor = template.responseEntityExtractor(byte[].class);
ResponseEntity<byte[]> results = template.execute(url, HttpMethod.GET, requestCallback, responseExtractor, uriVariables);

ByteArrayResource byteArrayResource = new ByteArrayResource(results.getBody());
return new ResponseEntity<Resource>(byteArrayResource, null, HttpStatus.OK);