使用 restTemplate 下载内容类型八位字节流的文件

Question

在我的应用程序中，我收到了来自 API 响应的文件，其 Content-Type 是 application/octet-stream。

我正在尝试 return 这个文件作为 ResponseEntity<Resource> 到前端。

但我收到错误消息：

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

通过浏览一些文档，我想到使用 responseEntityExtractor，与 RestTemplate.getForEntity 中的相同。

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，通过在请求回调中设置 setAccept 我们让 restTemplate 知道期望的内容类型，而 responseEntityExtractor() 将 return ResponseExtractor<ResponseEntity<T>>.

我错过了什么？

Answer 1

而不是：

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

尝试在控制器方法中 return byte[]：

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

或此为 return 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);

使用 restTemplate 下载内容类型八位字节流的文件

Download file of content-type octet-stream using restTemplate

java

rest

spring

resttemplate