使用带有基本身份验证和自定义标头的 Spring RestTemplate 发送 PDF 附件

Question

我需要使用 PUT 发送 PDF 附件，就像您在 POSTMAN POSTMAN Examples中附加文档一样。我正在使用的服务仅接受请求正文中的 PDF 文件。这是我的代码：// create new fileFileSystemResource file = new FileSystemResource(new File("/Users/name/Documents/test.pdf"));MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();body.add("file", file);// adding basic authHttpHeaders headers = createHeaders(username, password);// required custom headerheaders.set("X-Async-Scope", timelineEntryId);HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body, headers);RestTemplate restTemplate = new RestTemplate();ResponseEntity<String> response = restTemplate.exchange(baseUrl, HttpMethod.PUT, requestEntity, String.class);问题是响应带有状态代码415 Unsupported Media Type，我不知道为什么。我的 HttpEntity 正文格式错误吗？

Answer 1

HttpHeaders headers = createHeaders(username, password);

headers.setContentType(MediaType.APPLICATION_PDF);

headers.set("X-Async-Scope", timelineEntryId);

InputStream inputStream = new FileSystemResource(new File(file.getPath())).getInputStream();

byte[] binaryData = IOUtils.toByteArray(inputStream);

HttpEntity<byte[]> requestEntity = new HttpEntity<>(binaryData, headers);

RestTemplate restTemplate = new RestTemplate();

ResponseEntity<String> response = restTemplate.exchange(baseUrl, HttpMethod.PUT, requestEntity, String.class);

Answer 2

也许，您需要设置标题内容类型？

headers.set("Content-Type", "application/pdf")

如果没有帮助，您还应该设置标头 Content-Disposition：

headers.set("Content-Disposition", "attachment; filename="+fileName)

Answer 3

你可以试穿

  String headerKey = "Content-Disposition";

        String headerValue = "attachment; filename=category_list"  + ".xlsx";

        response.setHeader(headerKey, headerValue);

        categoryServiceImpl.exportToExcelFile(response);