springboot微信小程序支付

今天有项目开发用到多个微信商户进行支付的场景，使用微信的SDK不太方便，以下大概使用了微信支付的示例仅供参考：

微信支付在请求接口时都要生成请求头，直接上代码：

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/**  * 构造请求签名串  * @param method  * @param url  * @param timestamp  * @param nonceStr  * @param body  * @return  */ 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"; }

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/**  * 生成签名  * @param message  签名串  * @param privateKey 商户私钥  * @return  * @throws RemoteException  * @throws RuntimeException  */ static String sign(byte[] message, String privateKey) throws RemoteException,RuntimeException{     Signature sign = null;     String stringSign = null;     try {         sign = Signature.getInstance("SHA256withRSA");         try {             sign.initSign(PemUtil.loadPrivateKeyFromString(privateKey));             try {                 sign.update(message);                 stringSign = Base64.getEncoder().encodeToString(sign.sign());             } catch (SignatureException e) {                 throw new RemoteException(e.getMessage());             }         } catch (InvalidKeyException e) {             throw new RemoteException(e.getMessage());         }     } catch (NoSuchAlgorithmException e) {         throw new RemoteException(e.getMessage());     }     return stringSign; }

 

支付示例：

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/**  * 支付  * @param privateKeyPath  * @param privateKey  * @return  * @throws RemoteException  */ public static JSONObject pay() throws RemoteException{     //应用appid     String appid = "wxd*****3f";        //支付商户id     String merchantId = "163***20";     //支付密钥     String apiV3Key = "5dc*******413";     //商户系列号     String merchantSerialNumber = "62C345476F*****3E71981";     //商户商户私钥路径     String privateKeyPath = this.getClass().getResource("/static/wechat/apiclient_key.pem").getPath();     //使用hutool获取证书文件内容 privateKey     FileReader fileReader = new FileReader(privateKeyPath);     String privateKey = fileReader.readString();       //微信支付下单API     String url = "https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi";     HttpUrl httpurl = HttpUrl.parse(url);     JSONObject data = new JSONObject();     JSONObject amount = new JSONObject();     JSONObject payer = new JSONObject();     //随机数 这里示例我先用hutool随机生成     String nonce_str = String.valueOf(RandomUtil.randomInt(1043243, 100432432));     //订单号 这里示例我先用hutool随机生成     String out_trade_no = String.valueOf(RandomUtil.randomInt(1043243, 100432432));     //当前时间戳     long timestamp = System.currentTimeMillis()/1000;     data.put("mchid",merchantId);     data.put("out_trade_no",out_trade_no);     data.put("appid",appid);     data.put("description","支付测试");     data.put("notify_url","https://notify_url");     amount.put("total",1);     amount.put("currency","CNY");     payer.put("openid","oYZ*******HAhG8");     data.put("amount",amount);     data.put("payer",payer);     String message = buildMessage("POST", httpurl, timestamp, nonce_str, data.toJSONString());     String signature = null;     try {         //获取请求签名         signature = sign(message.getBytes("utf-8"),privateKey);     } catch (UnsupportedEncodingException e) {         throw new RemoteException(e.getMessage());     }     //生成请求头     String header = buildHeader(merchantId,nonce_str,signature,timestamp,merchantSerialNumber);     //发起请求     String result = HttpRequest.post(url)             .body(data.toJSONString())             .header("Content-Type", "application/json")             .header("Accept", "application/json")             .header("Authorization",header)             .execute().body();     JSONObject resultJson = JSONObject.parseObject(result);     JSONObject requestData = new JSONObject();     if(resultJson.get("code") != null){         requestData.put("code",100);         requestData.put("msg",resultJson.getString("message"));     }else{         String prepay_id = resultJson.getString("prepay_id");         JSONObject payData = payData(appid,timestamp,nonce_str,prepay_id,privateKey);         requestData.put("code",200);         requestData.put("res",payData);     }     return requestData; }   /**  * JSAPI调起支付  * @param appid  * @param timestamp  * @param nonceStr  * @param prepayId  * @param privateKey  * @return  * @throws RemoteException  */ public static JSONObject payData(String appid, long timestamp, String nonceStr, String prepayId,String privateKey) throws RemoteException{     String payMessage = payMessage(appid,timestamp,nonceStr,prepayId);     JSONObject data = new JSONObject();     try {         String paySign = sign(payMessage.getBytes("utf-8"),privateKey);         data.put("appId",appid);         data.put("timeStamp",timestamp);         data.put("package","prepay_id="+prepayId);         data.put("signType","RSA");         data.put("paySign",paySign);         data.put("nonceStr",nonceStr);       } catch (UnsupportedEncodingException e) {         throw new RemoteException(e.getMessage());     }     return data; }