我的操作流程 1.用官方sdk发送请求获取到prepay_id，但是sdk内并没有看到获取paySign签名的方法(返回前端用于拉起微信支付) // 读取证书私钥 PrivateKey privateKey = PemUtil.loadPrivateKey(new ClassPathResource("apiclient_key.pem").getInputStream()); // 读取平台证书(验签) X509Certificate certificate = PemUtil.loadCertificate( new ClassPathResource("wechatpay_774380E742E4F04BFCFA2804DA234160D8093CE3.pem").getInputStream()); List<X509Certificate> certificates = Arrays.asList(certificate); // 生成请求签名 WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create() .withMerchant(WxConstants.PAY_MCH_ID, WxConstants.PAY_SERIAL_NO, privateKey).withWechatpay(certificates); 2.生成paySign签名的方法(下段代码) public static String getSign(String nonceStr, long timestamp, String body, String serialPath) { // 请求路径 HttpUrl url = HttpUrl.parse("https://api.mch.weixin.qq.com/v3/certificates"); // 组装需要签名的数据 String message = buildMessage("GET", url, timestamp, nonceStr, body); // 使用私钥对数据进行签名（加密），【数据签名之后需要转换为字节数组（采用utf-8）】 String signature = null; try { signature = sign(message.getBytes("utf-8"), serialPath); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return signature; } private static String sign(byte[] message, String serialPath) { try { // 签名方式（固定SHA256withRSA） Signature sign = Signature.getInstance("SHA256withRSA"); // 使用私钥进行初始化签名（私钥需要从私钥文件【证书】中读取） sign.initSign(getPrivateKey(serialPath)); // 签名更新 sign.update(message); // 对签名结果进行Base64编码 return Base64.getEncoder().encodeToString(sign.sign()); } catch (SignatureException | InvalidKeyException | NoSuchAlgorithmException e) { e.printStackTrace(); } return null; } private static String buildMessage(String method, HttpUrl url, long timestamp, String nonceStr, String body) { String canonicalUrl = url.encodedPath(); if (url.encodedQuery() != null) { canonicalUrl += "?" + url.encodedQuery(); } return method + "\n" + canonicalUrl + "\n" + timestamp + "\n" + nonceStr + "\n" + body + "\n"; } 3.其中body参数传入空串或返还前端JSONObject的json串都有试过，都是在调起微信支付时弹窗提示支付验证签名失败 // 返回前端数据 JSONObject payMap = new JSONObject(); payMap.put("appId", WxConstants.OFFICIAL_APPID); long timestamp = System.currentTimeMillis() / 1000; payMap.put("timeStamp", timestamp + ""); String nonceStr = WXPayUtil.generateNonceStr(); payMap.put("nonceStr", nonceStr); payMap.put("package", "prepay_id=" + prepay_id); payMap.put("signType", "RSA"); // 生成请求签名 String jsonStr = new JSONObject(payMap).toJSONString(); String paySign = WxV3Authorization.getSign(nonceStr, timestamp, jsonStr, "apiclient_key.pem"); System.out.println("paySign:" + paySign); payMap.put("paySign", paySign); 4.生成签名样例 paySign:u/QxdeRo0+nalos8j+phrLLFCiygdXHa7RuushwG0QzgodrG+nfLKFoLDK77ojkNzdtB7yqySHriig90qjcZ8XhSOYAQ6WMRPWBhtJ+XgLJgrSk6kvDVXZ0YaDVa12jfruggYdK2lCaimuY0L6mxMdiwhxqWDIkyZadmh0N/nDPN/k+6Mjj8k2G6Gy6k0Nnlu+zldDclUwxPoKwNLYRUfTxZUho/8CQq/BlTIhDR+aGueZGu/dzfDOpxLHthTc3M00LNQtv4O7iT50Hgunqkug7ltS1Y63IUj+n/zMvDKTq3SONMo8XOilZrreRjXi4JbuLGWYIVR0XADz3+dik4mw== 5.错误截图 [图片] 第一次发帖排版不好大家见谅，望各位大佬