背景： 最近接到一个老项目需求，之前开发的WPS开放平台文件（商密集成）预览功能因为升级需要重新对接api，新的上传文件接口踩坑特意记录一下。

这里出问题的是第二步，请求文件上传信息

踩坑代码 调用后403 postman粘贴请求头和地址发起模拟调用成功

private String upload(StoreRequest storeRequest, File file) throws IOException, URISyntaxException {URI url = new URIBuilder(storeRequest.getUrl()).build();HttpHeaders headers = new HttpHeaders();List<Header> storeRequestHeaders = storeRequest.getHeaders();storeRequestHeaders.forEach(header -> headers.add(header.getName(), header.getValue()));byte[] fileBytes = Files.readAllBytes(file.toPath());HttpEntity<byte[]> requestEntity = new HttpEntity<>(fileBytes, headers);return restTemplate.postForObject(url,requestEntity, String.class).getBody();}

修改后：

private String upload(StoreRequest storeRequest, File file) throws IOException,  NoSuchAlgorithmException, KeyStoreException, KeyManagementException {// 1. 读取文件为字节数组byte[] fileBytes = Files.readAllBytes(file.toPath());// 2. 创建信任所有证书的 HttpClientSSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, (chain, authType) -> true).build();try (CloseableHttpClient httpClient = HttpClients.custom().setSSLContext(sslContext).setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE).build()) {// 3. 创建 POST 请求HttpPost httpPost = new HttpPost(storeRequest.getUrl());// 4. 设置 Headers（保持原始 Content-Type）List<Header> storeRequestHeaders = storeRequest.getHeaders();storeRequestHeaders.forEach(header ->httpPost.addHeader(header.getName(), header.getValue()));// 5. 设置请求体（二进制数据）ByteArrayEntity requestEntity = new ByteArrayEntity(fileBytes);httpPost.setEntity(requestEntity);// 6. 执行请求并获取响应HttpResponse response = httpClient.execute(httpPost);org.apache.http.Header[] headers = response.getHeaders("X-Wps3-Info-Token");// 7. 返回响应头中的 Tokenreturn headers[0].getValue();}}

问题原因

使用RestTemplate会自动根据上传二进制文件自动响应Content-Type为application/octet-stream
后与wps开发确认，此处的确是传空字符串。