使用得就是SDK工具 PrivateKey merchantPrivateKey = PemUtil.loadPrivateKey(privateKey); CertificatesManager certificatesManager = CertificatesManager.getInstance(); certificatesManager.putMerchant(mchId, new WechatPay2Credentials(mchId, new PrivateKeySigner(mchSerialNo, merchantPrivateKey)), apiV3Key.getBytes(StandardCharsets.UTF_8));