【wechatpay-apache-httpclient】官網(wǎng)：
https://github.com/wechatpay-apiv3/wechatpay-apache-httpclient
這個點一定要清晰（即：不需要自己去是生成簽名）

image.png

以JSAPI為例

【JSAPI支付】官網(wǎng)地址：
https://pay.weixin.qq.com/wiki/doc/apiv3/apis/chapter3_1_6.shtml

項目目錄：

image.png

工具類【W(wǎng)echatPayUtil】代碼 ：

  /**
   *  APP_ID（公眾號/小程序等）
   */
  private static final String APP_ID = "xxxx";
  /**
   * 商戶號 （微信商戶平臺可以獲取）
   */
  private static final String MERCHATN_ID = "xxx";
  /**
   * API_V3  （微信商戶平臺配置）
   */
  private static final String API_V3 = "xxxx";
  /**
   * 私鑰 （微信商戶平臺配置）
   */
  private static final String PRIVATE_KEY_PATH = "ice/channel_config/wechat/apiclient_key.pem";
  /**
   * 證書路徑 （自行設(shè)置）
   */
  private static final String CERT_PATH = "ice/channel_config/wechat/apiclient_cert.pem";
  /**
   * 證書序列號（微信商戶平臺配置） 
   */
  private static final String CERT_ID = "xxxxxx";

/**
   * 初始化  clientBuilder和證書管理器
   *
   * @return com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder
   * @author xxxx
   * @date 2022-11-25
   */
  public static WechatPayHttpClientBuilder initClientBuilder() throws IOException, GeneralSecurityException, HttpCodeException, NotFoundException {
    // 讀取證書及私鑰
    Resource resourcePrivateKey = new FileSystemResource(new File(PRIVATE_KEY_PATH));
    PrivateKey privateKey = PemUtil.loadPrivateKey(resourcePrivateKey.getInputStream());
    Resource resourceCert = new FileSystemResource(new File(CERT_PATH));
    X509Certificate cert = PemUtil.loadCertificate(resourceCert.getInputStream());
    // 微信證書管理器 
    CertificatesManager certificatesManager = CertificatesManager.getInstance();
    certificatesManager.putMerchant(
      MERCHATN_ID, 
      new WechatPay2Credentials(
        MERCHATN_ID, 
        new PrivateKeySigner(CERT_ID, privateKey)
      ), 
      API_V3.getBytes(StandardCharsets.UTF_8)
    );
    Verifier verifier = certificatesManager.getVerifier(MERCHATN_ID);
    // 初始化
    WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create()
            .withMerchant(MERCHATN_ID, CERT_ID, privateKey)
            .withWechatPay(Collections.singletonList(cert))
            .withValidator(new WechatPay2Validator(verifier));
    return builder;
  }

以對賬文件下載為例進行測試

對賬文件下載，根據(jù)官網(wǎng)說明：

image.png

JSAPI對賬文件下載API文檔官網(wǎng)：https://pay.weixin.qq.com/wiki/doc/apiv3/apis/chapter3_1_8.shtml
請求頭【Accept: application/json】必須要設(shè)置润歉，不設(shè)置會報錯吵取；【Content-Type: application/json】測試發(fā)現(xiàn)可以不設(shè)置

image.png

下面這個地方看起來像是要進行簽名后再發(fā)起請求藕夫，但是實際上使用【wechatpay-apache-httpclient】的時候并不需要（工具類自己會簽名）昌屉，別被誤導了

image.png

【測試代碼】

public static void main(String[] args) throws Exception {

    // 交易賬單申請 https://api.mch.weixin.qq.com/v3/bill/tradebill?bill_date=2022-11-23
    CloseableHttpClient applyClient = WechatPayUtil.initClientBuilder().build();
    // 初始化請求
    HttpGet applyHttpGet = new HttpGet("https://api.mch.weixin.qq.com/v3/bill/tradebill?bill_date=2022-11-23");
    // 請求頭設(shè)置 官方說明：https://pay.weixin.qq.com/wiki/doc/apiv3/wechatpay/wechatpay2_0.shtml
    applyHttpGet.addHeader("Accept", "application/json");
    applyHttpGet.addHeader("Content-type", "application/json; charset=utf-8");
    // 發(fā)起請求
    CloseableHttpResponse applyResponse = applyClient.execute(applyHttpGet);
    // 結(jié)果轉(zhuǎn)換為Map
    String applyResponseEntityStr = EntityUtils.toString(applyResponse.getEntity());
    System.out.println(">>>>>>>>>【對賬文件申請】響應結(jié)果：" + applyResponseEntityStr);
    Map applyResponseMap = new ObjectMapper().readValue(applyResponseEntityStr, Map.class);
    applyClient.close();
    applyResponse.close();

    // 交易賬單下載
    String downloadUrl = (String) applyResponseMap.get("download_url");
   CloseableHttpClient downloadClient = WechatPayUtil.initClientBuilder().withValidator(response -> true).build();
    HttpGet downloadHttpGet = new HttpGet(downloadUrl);
    // 請求頭設(shè)置 官方說明：https://pay.weixin.qq.com/wiki/doc/apiv3/wechatpay/wechatpay2_0.shtml
    downloadHttpGet.addHeader("Accept", "application/json");
    downloadHttpGet.addHeader("Content-type", "application/json; charset=utf-8");
    // 發(fā)起請求
    CloseableHttpResponse downloadResponse = downloadClient.execute(downloadHttpGet);
    // 結(jié)果轉(zhuǎn)換為String
    String downloadResponseEntityStr = EntityUtils.toString(downloadResponse.getEntity());
    System.out.println(">>>>>>>>>【交易賬單下載-string】響應結(jié)果：");
    System.out.println(downloadResponseEntityStr);
    // 結(jié)果轉(zhuǎn)換為List<String>
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(EntityUtils.toByteArray(downloadResponse.getEntity()))));
    List<String> resultList = bufferedReader.lines().collect(Collectors.toList());
    System.out.println(MessageFormat.format(">>>>>>>>>【交易賬單下載-List<String>】響應結(jié)果：總計【{0}】條",resultList.size()));
    resultList.forEach(System.out::println);
    downloadClient.close();
    downloadResponse.close();
  }

【測試結(jié)果】

【對賬交易文件申請】返回結(jié)果：

【對賬文件申請】響應結(jié)果：{"download_url":"https://api.mch.weixin.qq.com/v3/billdownload/file?token=om9r_WnzFUSMg24K4PYrtC7_byEZrIlmsMOJ8y7u_JPJP0D1F2AC_U6rtLAIsjlm","hash_type":"SHA1","hash_value":"f9ecef7bc7429e89b83e5ec4742b2699c74b5a11"}

【對賬交易文件下載】返回結(jié)果：（返回數(shù)據(jù)中丸凭，敏感數(shù)據(jù)已被替換為對應中文）

>>>>>>>>>【交易賬單下載-string】響應結(jié)果：
交易時間,公眾賬號ID,商戶號,特約商戶號,設(shè)備號,微信訂單號,商戶訂單號,用戶標識,交易類型,交易狀態(tài),付款銀行,貨幣種類,應結(jié)訂單金額,代金券金額,微信退款單號,商戶退款單號,退款金額,充值券退款金額,退款類型,退款狀態(tài),商品名稱,商戶數(shù)據(jù)包,手續(xù)費,費率,訂單金額,申請退款金額,費率備注
`2022-11-23 15:21:15,`公眾賬號ID,`商戶號,`0,`,`4200001642202211233962981879,`1595316481882824704,`用戶標識,`JSAPI,`SUCCESS,`OTHERS,`CNY,`0.01,`0.00,`0,`0,`0.00,`0.00,`,`,`null用戶的水費訂單收費記錄,`,`0.00000,`0.54%,`0.01,`0.00,`
`2022-11-23 15:11:51,`公眾賬號ID,`商戶號,`0,`,`4200001661202211230109762244,`1595314109068582912,`用戶標識,`JSAPI,`SUCCESS,`OTHERS,`CNY,`0.01,`0.00,`0,`0,`0.00,`0.00,`,`,`null用戶的水費訂單收費記錄,`,`0.00000,`0.54%,`0.01,`0.00,`
`2022-11-23 19:24:25,`公眾賬號ID,`商戶號,`0,`,`4200001666202211235431097357,`1595377702036283392,`用戶標識,`JSAPI,`SUCCESS,`OTHERS,`CNY,`0.03,`0.00,`0,`0,`0.00,`0.00,`,`,`h001用戶的水費訂單收費記錄,`,`0.00000,`0.54%,`0.03,`0.00,`
總交易單數(shù),應結(jié)訂單總金額,退款總金額,充值券退款總金額,手續(xù)費總金額,訂單總金額,申請退款總金額
`3,`0.05,`0.00,`0.00,`0.00000,`0.05,`0.00

>>>>>>>>>【交易賬單下載-List<String>】響應結(jié)果：總計【6】條
交易時間,公眾賬號ID,商戶號,特約商戶號,設(shè)備號,微信訂單號,商戶訂單號,用戶標識,交易類型,交易狀態(tài),付款銀行,貨幣種類,應結(jié)訂單金額,代金券金額,微信退款單號,商戶退款單號,退款金額,充值券退款金額,退款類型,退款狀態(tài),商品名稱,商戶數(shù)據(jù)包,手續(xù)費,費率,訂單金額,申請退款金額,費率備注
`2022-11-23 15:21:15,`公眾賬號ID,`商戶號,`0,`,`4200001642202211233962981879,`1595316481882824704,`用戶標識,`JSAPI,`SUCCESS,`OTHERS,`CNY,`0.01,`0.00,`0,`0,`0.00,`0.00,`,`,`null用戶的水費訂單收費記錄,`,`0.00000,`0.54%,`0.01,`0.00,`
`2022-11-23 15:11:51,`公眾賬號ID,`商戶號,`0,`,`4200001661202211230109762244,`1595314109068582912,`用戶標識,`JSAPI,`SUCCESS,`OTHERS,`CNY,`0.01,`0.00,`0,`0,`0.00,`0.00,`,`,`null用戶的水費訂單收費記錄,`,`0.00000,`0.54%,`0.01,`0.00,`
`2022-11-23 19:24:25,`公眾賬號ID,`商戶號,`0,`,`4200001666202211235431097357,`1595377702036283392,`用戶標識,`JSAPI,`SUCCESS,`OTHERS,`CNY,`0.03,`0.00,`0,`0,`0.00,`0.00,`,`,`h001用戶的水費訂單收費記錄,`,`0.00000,`0.54%,`0.03,`0.00,`
總交易單數(shù),應結(jié)訂單總金額,退款總金額,充值券退款總金額,手續(xù)費總金額,訂單總金額,申請退款總金額
`3,`0.05,`0.00,`0.00,`0.00000,`0.05,`0.00