使用服务商/点商品平台v3文件上传接口时，返回的一直是400，且没有任何错误代码 发起方法 public String partnerMediaUpload(MultipartFile file1) throws IOException { // 构建uri URI uri = buildPartnerUpdateURI(); // 创建post请求 HttpPost httpPost = new HttpPost(); // 使用演示的文件 File file = new File("D:\\temp\\afa3b3dc1bc087324cb264b747dcffc.jpg"); // 文件名称以及后缀 String fileName = file.getName(); String fileSuffixName = FileUtils.getFileSuffixName(fileName); // sha256计算 String sha256; try { InputStream inputStream = Files.newInputStream(file.toPath()); sha256 = DigestUtils.sha256Hex(inputStream); inputStream.close(); } catch (IOException e) { logger.error("将图片进行二进制进行sha256失败！错误信息为：{}", e.getMessage()); throw new ServiceException("上传文件失败！"); } // meta信息 Map<String, String> metaParam = new HashMap<>(); metaParam.put("filename", fileName); metaParam.put("sha256", sha256); String metaJsonStr = JSON.toJSONString(metaParam); // 构建请求body MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create(); entityBuilder .setBoundary(BOUNDARY) .setMode(HttpMultipartMode.RFC6532) .addTextBody("meta", metaJsonStr, ContentType.APPLICATION_JSON) .addBinaryBody("file", Files.newInputStream(file.toPath()), ContentType.create(MIMEUtils.ofMimeType(fileSuffixName)), fileName); HttpEntity entity = entityBuilder.build(); // 生成签名 WxSignResultDetailDTO signDetail; try { signDetail = WxPayUtils.sign(httpPost, WxPayUrlPathConstant.PARTNER_MERCHANT_MEDIA_UPLOAD, metaJsonStr, wxPayHttpClient.buildPrivateKey()); } catch (NoSuchAlgorithmException | SignatureException | InvalidKeyException e) { logger.error("生成微信图片签名失败！错误信息为:{}", e.getMessage()); throw new ServiceException("上传文件失败！"); } // 构建请求头参数 String contentType = "multipart/form-data;boundary=" + BOUNDARY; String authorization = "WECHATPAY2-SHA256-RSA2048 " + "mchid=\"" + wxPayConfig.getMerchantId() + "\"," + "nonce_str=\"" + signDetail.getNonceStr() + "\"," + "timestamp=\"" + signDetail.getTimestamp() + "\"," + "serial_no=\"" + wxPayConfig.getMerchantSerialNumber() + "\"," + "signature=\"" + signDetail.getSignature() + "\""; // 添加请求参数 httpPost.setURI(uri); httpPost.setEntity(entity); httpPost.setHeader("Content-Type", contentType); httpPost.setHeader("Authorization", authorization); // 发送请求 WxRes<WxPartnerMediaUploadRes> uploadRes = wxPayHttpClient.execute(httpPost, WxPartnerMediaUploadRes.class); if (!Objects.equals(Boolean.TRUE, uploadRes.getSuccess())) { logger.error("发送微信上传图片请求失败 ！请求地址为：{}，错误信息为{}", WxPayUrlPathConstant.PARTNER_MERCHANT_MEDIA_UPLOAD, uploadRes.getErrMsg()); throw new ServiceException("上传失败！"); } return uploadRes.getData().getMedia_id(); } 签名方法 public static WxSignResultDetailDTO sign(HttpRequestBase request, String url, String paramsStr, PrivateKey privateKey) throws NoSuchAlgorithmException, SignatureException, InvalidKeyException { // 生成一个随机数（这里使用uuid） String nonceStr = UUID.randomUUID().toString().replace("-", ""); // 当前时间戳(按秒) long timestamp = System.currentTimeMillis() / 1000; // 需要签名的字符串 String message = request.getMethod() + "\n" + url + "\n" + timestamp + "\n" + nonceStr + "\n" + paramsStr + "\n"; // 进行签名 String sign = sign(message.getBytes(StandardCharsets.UTF_8), privateKey); // 封装参数 WxSignResultDetailDTO result = new WxSignResultDetailDTO(); result.setNonceStr(nonceStr); result.setTimestamp(String.valueOf(timestamp)); result.setSignature(sign); return result; } private static String sign(byte[] message, PrivateKey privateKey) throws NoSuchAlgorithmException, SignatureException, InvalidKeyException { // 创建一个签名对象 Signature sign = Signature.getInstance("SHA256withRSA"); // 初始化私钥 sign.initSign(privateKey); // 添加消息体 sign.update(message); // 生成签名 return Base64.getEncoder().encodeToString(sign.sign()); } debug的信息： Authorization: WECHATPAY2-SHA256-RSA2048 mchid="********",nonce_str="66f55f5a69e843fd94a04e8e9677d9b7",timestamp="1689132016",serial_no="***************************",signature="0oS5i68DJTzVUhctKYEaoXPRUkPfPK9tSMYivIxTKGFBg7SLAAegHVhM6wvGYhH/oyZGTniaP0agcZG8S8+MkyXRP3qgMKaauC1b3uqwSJBMq7gZJRoS6RmUfG9jUgu+gf3OZJNbRGoQqe6IbDHu6EGXGW0pNFr+BkRBWyFJGjGOv+XvzAyx/+Os3BJc0NrnFtvmyXVoS0V1bjVcd9rJgK9pkmkQ9c+8ehq7ocvsvmkWgfKiBVymhiNICdjkevjjGZrHQGsjj8oyiPMSY8IDb5F7udjIVYRGXqNY/MGWetnVgHsW7ZpCCgmHxchx2mSPUjdB0dJFdfRpESzDwP4urQ==" [图片] 错误信息为： 11:23:29.283 [http-nio-9207-exec-3] ERROR c.w.p.c.a.h.SignatureExec - [executeWithSignature,95] - 应答的状态码不为200-299。status code[400]    request headers[[Content-Type: multipart/form-data;boundary=mengchongtech, Authorization: WECHATPAY2-SHA256-RSA2048 mchid="******",nonce_str="66f55f5a69e843fd94a04e8e9677d9b7",timestamp="1689132016",serial_no="***********************",signature="0oS5i68DJTzVUhctKYEaoXPRUkPfPK9tSMYivIxTKGFBg7SLAAegHVhM6wvGYhH/oyZGTniaP0agcZG8S8+MkyXRP3qgMKaauC1b3uqwSJBMq7gZJRoS6RmUfG9jUgu+gf3OZJNbRGoQqe6IbDHu6EGXGW0pNFr+BkRBWyFJGjGOv+XvzAyx/+Os3BJc0NrnFtvmyXVoS0V1bjVcd9rJgK9pkmkQ9c+8ehq7ocvsvmkWgfKiBVymhiNICdjkevjjGZrHQGsjj8oyiPMSY8IDb5F7udjIVYRGXqNY/MGWetnVgHsW7ZpCCgmHxchx2mSPUjdB0dJFdfRpESzDwP4urQ==", Accept: application/json, Authorization: WECHATPAY2-SHA256-RSA2048 mchid="********",nonce_str="4FlV9Blikk8d42Yyj96VclRqVLRvbPu0",timestamp="1689132209",serial_no="*****************",signature="gFOocuO5z2o7gPlW/ZJj9PRp9XHVH4VQ40kcn/EA6DwXsiMRMFCSjZecJ6t/ob/U5+zinLgzFj+uX7VJOzefrz/N1+NktdDzYB/tGHpiFKqYVdtCBXziOMDuePM+ydx4uyN5rObHdpYYkK4qIW5RRAL/WYm+sgguHQ4moYDppWVj8Cyx/QP6JShAHFkYkfYRW3RV9TaOxcQdC84u1A+HLXODAPHf0csTTYzQvVdJ9NbJJLHzzojLIY9lcor7TJldK8yxV1E+MT5mjC1JIh3KxLgY7MSE0UQsEaLx0eAeqe0YkiaAoGMM7vMrVL6ezmTcAXEpToXwivUnAGisHV6hGg==", Content-Length: 193679, Host: api.mch.weixin.qq.com, Connection: Keep-Alive, User-Agent: WechatPay-Apache-HttpClient/0.4.8 (Windows 10/10.0) Java/1.8.0_202, Accept-Encoding: gzip,deflate]] 11:23:29.285 [http-nio-9207-exec-3] ERROR c.w.p.c.a.h.SignatureExec - [executeWithSignature,100] - 应答的状态码不为200-299。request body [--mengchongtech Content-Disposition: form-data; name="meta" Content-Type: application/json; charset=UTF-8 Content-Transfer-Encoding: 8bit {"filename":"afa3b3dc1bc087324cb264b747dcffc.jpg","sha256":"1f03585317885cc1603cb28fa4ab07bcd272b3f2508594406d89177226ce6305"} --mengchongtech Content-Disposition: form-data; name="file"; filename="afa3b3dc1bc087324cb264b747dcffc.jpg" Content-Type: image/jpeg Content-Transfer-Encoding: binary ÿØÿà JFIF     ÿÛ C    #,%!*!&4'*./121%6:60:,010ÿÛ C         0 00000000000000000000000000000000000000000000000000ÿÀ     ä’" ÿÄ ……文件二进制流 . . . . ,qF¡`*€ KEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPEPÿÙЁ;    Æ…™Êó}NQü¢ìf/ --mengchongtech-- ]               一直找不到错误，麻烦看一下错误在哪里。