@ApiOperation("上传电子发票文件")
@PostMapping("uploadFapiaoFile")
public Result uploadFapiaoFile() throws IOException, NoSuchAlgorithmException, NoSuchProviderException, SignatureException, InvalidKeyException {
    String url = wxPay.getDomain() + "/v3/new-tax-control-fapiao/fapiao-applications/upload-fapiao-file";
    HttpUrl parse = HttpUrl.parse(url);
    FileInputStream fis = new FileInputStream("E:\\online-consultation\\处方.pdf");
    StringBuilder sb = new StringBuilder();
    int data;
    while ((data = fis.read()) != -1) {
        sb.append((char) fis.read());
    }
    byte[] bytes = sb.toString().getBytes(StandardCharsets.UTF_8);
    String sm3LowerCase = SM3.digest(sb.toString()).toLowerCase();
    log.info("SM3[{}]", sm3LowerCase);
    JSONObject meta = new JSONObject();
    meta.put("digest", sm3LowerCase);
    meta.put("digest_algorithm", "SM3");
    meta.put("file_type", "PDF");
    String signatureString = WxSignatureUtil.getSignatureString("POST", parse, meta.toString());
    log.info("signature[{}]", signatureString);
    MultipartBody multipartBody = new MultipartBody.Builder()
            .setType(MultipartBody.FORM)
            .addFormDataPart("file", "file", RequestBody.create(MediaType.parse("pdf/plain"), sb.toString().getBytes(StandardCharsets.UTF_8)))
            .addFormDataPart("meta", "meta", RequestBody.create(MediaType.parse("application/json"), meta.toString()))
            .build();
    OkHttpClient client = new OkHttpClient();
    Request build = new Request.Builder()
            .addHeader("Content-Type", "multipart/form-data")
            .addHeader("Authorization", signatureString)
            .addHeader("Accept","application/json")
            .url(url)
            .post(multipartBody)
            .build();
    Response response = client.newCall(build).execute();
    ResponseBody body = response.body();
    String string = body.string();
    return Result.ok(string);
}
{
 “代码”： “SIGN_ERROR”，
 “详细信息”： {
 “详细信息”： {
 “issue”： “sign not match”
 }，
 “field”： “签名”，
 “location”： “授权”，
 “sign_information”：{
 “method”： “发布”，
 “sign_message_length”：116，
 “truncated_sign_message”： “POST\n/v3/new-tax-control-fapiao/fapiao-applications/upload-fapiao-file\n1722237276\nKhFTsY2fM2rsnhSu3Dm28CdpSwBWYf1B\n\n”，
 “url”： “/v3/new-tax-control-fapiao/fapiao-applications/upload-fapiao-file”
		}
 }，
 “message”： “错误的签名，验签失败”
}