springboot实现微信小程序V3微信支付功能

1. 程序开发前的准备工作，获取微信支付相关的参数

• appId：小程序appid
• appSecret：小程序的secret
• mchId：商户号
• keyPath：商户私钥路径（apiclient_key.pem）
• certPath：证书路径（apiclient_cert.pem）
• platFormPath：平台证书（cert.pem）
  注 : 需要通过写程序生成平台证书（见v3Get()方法）
• apiKey3：apiv3密钥
• serialnumber：商户证书序列号
• notifyUrl：回调地址
  注 : 回调地址需要是线上能访问到的地址，本地的地址是无效的

1.1 在application.yml文件中填写配置信息

# 微信支付
pay:
  wechat:
    appId: xxx
    appSecret: xxx
    mchId: xxx
    # 商户私钥路径
    keyPath: D:\xx\xx\WxPay\apiclient_key.pem
    # 证书路径
    certPath: D:\xx\xx\\WxPay\apiclient_cert.pem
    platFormPath: D:\xx\xx\\WxPay\cert.pem  # 后续生成的平台证书路径
    # apiv3秘钥
    apiKey3: xxx
    # 商户证书序列号
    serialnumber: xxx
    # 回调地址
    notifyUrl: http://xxx:xx/wx/pay/payNotify # 线上地址

1.2 获取配置文件中的参数

	/**微信小程序appid**/
    @Value("${pay.wechat.appId}")
    String appid;

    /**微信小程序secretId**/
    @Value("${pay.wechat.appSecret}")
    String secret;

    /**商户号**/
    @Value("${pay.wechat.mchId}")
    String mchid;

    /**商户密钥**/
    @Value("${pay.wechat.apiKey3}")
    String mchKey;

    /**回调地址**/
    @Value("${pay.wechat.notifyUrl}")
    String notifyUrl;

    /**证书地址**/
    @Value("${pay.wechat.certPath}")
    String certPath;

    /**证书密钥地址**/
    @Value("${pay.wechat.keyPath}")
    String certKeyPath;

    /**微信平台证书**/
    @Value("${pay.wechat.platFormPath}")
    String platFormPath;

    /**证书序列号**/
    @Value("${pay.wechat.serialnumber}")
    String serialNumber;

2. 在pom.xml中引入相关依赖

		<!-- https://mvnrepository.com/artifact/com.github.javen205/IJPay-WxPay -->
        <dependency>
            <groupId>com.github.javen205</groupId>
            <artifactId>IJPay-WxPay</artifactId>
            <version>2.7.4</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/cn.hutool/hutool-core -->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-core</artifactId>
            <version>5.8.16</version>
        </dependency>

        <dependency>
            <groupId>com.github.wechatpay-apiv3</groupId>
            <artifactId>wechatpay-apache-httpclient</artifactId>
            <version>0.4.7</version>
        </dependency>

3. 实现微信支付相关方法

3.1 获取平台证书

	public String v3Get() {
        // 获取平台证书列表
        try {
            IJPayHttpResponse response = WxPayApi.v3(
                    RequestMethod.GET,
                    WxDomain.CHINA.toString(),
                    WxApiType.GET_CERTIFICATES.toString(),
                    mchid,
                    serialNumber,
                    null,
                    certKeyPath,
                    ""
            );
            String serialNumber = response.getHeader("Wechatpay-Serial");
            String body = response.getBody();
            int status = response.getStatus();
            log.info("serialNumber: {}", serialNumber);
            log.info("status: {}", status);
            log.info("body: {}", body);
            int isOk = 200;
            if (status == isOk) {
                JSONObject jsonObject = JSONUtil.parseObj(body);
                JSONArray dataArray = jsonObject.getJSONArray("data");
                // 默认认为只有一个平台证书
                JSONObject encryptObject = dataArray.getJSONObject(0);
                JSONObject encryptCertificate = encryptObject.getJSONObject("encrypt_certificate");
                String associatedData = encryptCertificate.getStr("associated_data");
                String cipherText = encryptCertificate.getStr("ciphertext");
                String nonce = encryptCertificate.getStr("nonce");
                String serialNo = encryptObject.getStr("serial_no");
                final String platSerialNo = savePlatformCert(associatedData, nonce, cipherText, platFormPath);
                log.info("平台证书序列号: {} serialNo: {}", platSerialNo, serialNo);
            }
            // 根据证书序列号查询对应的证书来验证签名结果
            boolean verifySignature = WxPayKit.verifySignature(response, platFormPath);
            System.out.println("verifySignature:" + verifySignature);
            return body;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    
    // 保存平台证书
    private String savePlatformCert(String associatedData, String nonce, String cipherText, String certPath) {
        try {
            AesUtil aesUtil = new AesUtil(mchKey.getBytes(StandardCharsets.UTF_8));
            // 平台证书密文解密
            // encrypt_certificate 中的  associated_data nonce  ciphertext
            String publicKey = aesUtil.decryptToString(
                    associatedData.getBytes(StandardCharsets.UTF_8),
                    nonce.getBytes(StandardCharsets.UTF_8),
                    cipherText
            );
            // 保存证书
            cn.hutool.core.io.file.FileWriter writer = new FileWriter(certPath);
            writer.write(publicKey);
            // 获取平台证书序列号
            X509Certificate certificate = PayKit.getCertificate(new ByteArrayInputStream(publicKey.getBytes()));
            return certificate.getSerialNumber().toString(16).toUpperCase();
        } catch (Exception e) {
            e.printStackTrace();
            return e.getMessage();
        }
    }

3.2 微信支付

	public String wxPay(String openId, String payId, int amount) {
        //商户订单号(随机字符串)
//        String orderSn = PayKit.generateStr();
        try {
            String timeExpire = DateTimeZoneUtil.dateToTimeZone(System.currentTimeMillis() + 1000 * 60 * 3);
            UnifiedOrderModel unifiedOrderModel = new UnifiedOrderModel()
                    // APPID
                    .setAppid(appid)
                    // 商户号
                    .setMchid(mchid)
                    .setDescription("门票账单支付")
                    .setOut_trade_no(payId)
                    .setTime_expire(timeExpire)
                    .setNotify_url(notifyUrl)
                    .setAmount(new Amount().setTotal(amount))
                    .setPayer(new Payer().setOpenid(openId));

            log.info("统一下单参数 {}", JSONUtil.toJsonStr(unifiedOrderModel));
            IJPayHttpResponse response = WxPayApi.v3(
                    RequestMethod.POST,
                    WxDomain.CHINA.toString(),
                    WxApiType.JS_API_PAY.toString(),
                    mchid,
                    serialNumber,
                    null,
                    certKeyPath,
                    JSONUtil.toJsonStr(unifiedOrderModel)
            );
            log.info("统一下单响应 {}", response);
            // 根据证书序列号查询对应的证书来验证签名结果
            boolean verifySignature = WxPayKit.verifySignature(response, platFormPath);
            log.info("verifySignature: {}", verifySignature);
            if (response.getStatus() == HttpStatus.HTTP_OK && verifySignature) {
                String body = response.getBody();
                JSONObject jsonObject = JSONUtil.parseObj(body);
                String prepayId = jsonObject.getStr("prepay_id");
                Map<String, String> map = WxPayKit.jsApiCreateSign(appid, prepayId, certKeyPath);
                log.info("唤起支付参数:{}", map);
                String jsonStr = JSONUtil.toJsonStr(map);
                return jsonStr;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

3.3 微信支付回调

    public void payNotify(HttpServletRequest request, HttpServletResponse response) {
        Map<String, String> map = new HashMap<>(12);
        try {
            String timestamp = request.getHeader("Wechatpay-Timestamp");
            String nonce = request.getHeader("Wechatpay-Nonce");
            String serialNo = request.getHeader("Wechatpay-Serial");
            String signature = request.getHeader("Wechatpay-Signature");

            log.info("timestamp:{} nonce:{} serialNo:{} signature:{}", timestamp, nonce, serialNo, signature);
            String result = HttpKit.readData(request);
            log.info("支付通知密文 {}", result);

            // 需要通过证书序列号查找对应的证书，verifyNotify 中有验证证书的序列号
            String plainText = WxPayKit.verifyNotify(serialNo, result, signature, nonce, timestamp,
                    mchKey, platFormPath);

            log.info("支付通知明文 {}", plainText);

            if (StrUtil.isNotEmpty(plainText)) {
                response.setStatus(200);
                map.put("code", "SUCCESS");
                map.put("message", "SUCCESS");
            } else {
                response.setStatus(500);
                map.put("code", "ERROR");
                map.put("message", "签名错误");
            }
            response.setHeader("Content-type", ContentType.JSON.toString());
            response.getOutputStream().write(JSONUtil.toJsonStr(map).getBytes(StandardCharsets.UTF_8));
            response.flushBuffer();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

3.4 微信退款

    public String payRefund(int amount, int qty, String outTradeNo, String outRefundNo) {
        log.info("进入退款接口------>" );
        log.info("执行操作的 原支付交易对应的商户订单号：{}", outTradeNo );

        try {
//            String outRefundNo = PayKit.generateStr();
            log.info("商户退款单号: {}", outRefundNo);
            List<RefundGoodsDetail> list = new ArrayList<>();
            RefundGoodsDetail refundGoodsDetail = new RefundGoodsDetail()
                    .setMerchant_goods_id(outRefundNo)
                    .setGoods_name("取消订单")
                    .setUnit_price(amount)     //金额，单位为分
                    .setRefund_amount(amount)
                    .setRefund_quantity(qty);
            list.add(refundGoodsDetail);

            RefundModel refundModel = new RefundModel()
                    .setOut_refund_no(outRefundNo)
                    .setReason("取消订单")
                    //.setNotify_url(wechatPayV3Bean.getDomain().concat("/wechat/operation/pay/refundNotify")) //退款异步回调通知
                    .setAmount(new RefundAmount().setRefund(1).setTotal(1).setCurrency("CNY"))
                    .setGoods_detail(list);
            if (outTradeNo != null && !outTradeNo.equals("")) {
                refundModel.setOut_trade_no( outTradeNo );
            }
            log.info("退款参数: {}", JSONUtil.toJsonStr(refundModel));
            IJPayHttpResponse response = WxPayApi.v3(
                    RequestMethod.POST,
                    WxDomain.CHINA.toString(),
                    WxApiType.DOMESTIC_REFUNDS.toString(),
                    mchid,
                    serialNumber,
                    null,
                    certKeyPath,
                    JSONUtil.toJsonStr(refundModel)
            );
            log.info("退款响应 {}", response);

            // 根据证书序列号查询对应的证书来验证签名结果
            boolean verifySignature = WxPayKit.verifySignature(response, platFormPath);
            log.info("verifySignature: {}", verifySignature);

            String body = response.getBody();
            JSONObject jsonObject = JSONUtil.parseObj(body); //转换为JSON
            log.info("响应数据：" + body);

            if(response.getStatus()==200){ //退款成功，处理业务逻辑
                System.out.println("==================================");
                System.out.println("退款成功！");
            }
            if (verifySignature) {
                return response.getBody();
            }
        } catch (Exception e) {
            e.printStackTrace();
            return e.getMessage();
        }
        return null;
    }

3.5 订单查询

    public String queryPayResult(String payId) throws Exception{
        WechatPayHttpClientBuilder builder = getWechatPayHttpClientBuilder();
        CloseableHttpClient httpClient = builder.build();

        String result = "";
        try {
            URIBuilder uriBuilder = new URIBuilder("https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/"+ payId +"?mchid=" + mchid);
            HttpGet httpGet = new HttpGet(uriBuilder.build());
            httpGet.addHeader("Accept", "application/json");
            CloseableHttpResponse response = httpClient.execute(httpGet);

            result = EntityUtils.toString(response.getEntity());
            log.info("支付信息：" + result);

            JSONObject jsonObject = JSONUtil.parseObj(result);
            String code = jsonObject.getStr("trade_state");
            log.info("支付结果：" + code);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
    
    private WechatPayHttpClientBuilder getWechatPayHttpClientBuilder() throws Exception{
        PrivateKey merchantPrivateKey = PemUtil.loadPrivateKey(
                new FileInputStream(certKeyPath));

        // 获取证书管理器实例
        CertificatesManager certificatesManager = CertificatesManager.getInstance();

        // 向证书管理器增加需要自动更新平台证书的商户信息
        certificatesManager.putMerchant(mchid, new WechatPay2Credentials(mchid,
                new PrivateKeySigner(serialNumber, merchantPrivateKey)), mchKey.getBytes(StandardCharsets.UTF_8));
        // ... 若有多个商户号，可继续调用putMerchant添加商户信息

        // 从证书管理器中获取verifier
        Verifier verifier = certificatesManager.getVerifier(mchid);

        X509Certificate certificate = verifier.getValidCertificate();
        List<X509Certificate> certificates = new ArrayList<>();
        certificates.add(certificate);

        WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create()
                .withMerchant(mchid, serialNumber, merchantPrivateKey)
                .withWechatPay(certificates);

        // 通过WechatPayHttpClientBuilder构造的HttpClient，会自动的处理签名和验签
        return builder;
    }

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