对接微信米大师虚拟支付2.0文档

话不多说 上代码;

    //支付密钥算法

    public static String calcPaySig(String uri, String postBody, String appKey) {
        String needSignMsg = uri + "&" + postBody;
        try {
            Mac sha256Hmac = Mac.getInstance("HmacSHA256");
            SecretKeySpec secretKey = new SecretKeySpec(appKey.getBytes(StandardCharsets.UTF_8), "HmacSHA256");
            sha256Hmac.init(secretKey);
            byte[] hmacBytes = sha256Hmac.doFinal(needSignMsg.getBytes(StandardCharsets.UTF_8));
            StringBuilder hexString = new StringBuilder();
            for (byte hmacByte : hmacBytes) {
                String hex = Integer.toHexString(0xff & hmacByte);
                if (hex.length() == 1) hexString.append('0');
                hexString.append(hex);
            }
            return hexString.toString();
        } catch (NoSuchAlgorithmException | InvalidKeyException e) {
            e.printStackTrace();
            return null;
        }
    }

    // 签名密钥算法
    public static String calcSignature(String postBody, String sessionKey) {
        String needSignMsg = postBody;
        try {
            Mac sha256Hmac = Mac.getInstance("HmacSHA256");
            SecretKeySpec secretKey = new SecretKeySpec(sessionKey.getBytes(StandardCharsets.UTF_8), "HmacSHA256");
            sha256Hmac.init(secretKey);
            byte[] hmacBytes = sha256Hmac.doFinal(needSignMsg.getBytes(StandardCharsets.UTF_8));
            StringBuilder hexString = new StringBuilder();
            for (byte hmacByte : hmacBytes) {
                String hex = Integer.toHexString(0xff & hmacByte);
                if (hex.length() == 1) hexString.append('0');
                hexString.append(hex);
            }
            return hexString.toString();
        } catch (NoSuchAlgorithmException | InvalidKeyException e) {
            e.printStackTrace();
            return null;
        }
    }

 业务代码：

 /**
     * 虚拟支付2.0
     * pay_v2.getBalance
     *
     * @param dto
     * @return
     */
    public MidasBalanceV2VO balanceV2(MidasBalanceV2DTO dto) {

        OrderInfo orderInfo = orderInfoRepo.getByOrderNumber(dto.getOrderNumber());
        String sessionKey = wxApiSessionKeyAndOpenIdRedis.retrieve(dto.getOpenid())[0];
        if (Objects.isNull(orderInfo))throw new AppException(ErrorCode.ORDER_INFO_NO_EXIST);

        WxAppletConfig wxConfig = gameAppRepo.getByAppNumber(dto.getAppNumber()).getWxAppletConfig();
        if (Objects.isNull(wxConfig) || StringUtils.isBlank(wxConfig.getWxAppletAppId()) || StringUtil.isBlank(wxConfig.getWxAppletSecret())) {
            throw new AppException(ErrorCode.SYS_ERROR.code(), "应用未配置小程序信息");
        }
        GetBalanceParamV2 paramV2 = new GetBalanceParamV2(wxConfig.getMidasOfferId(),dto.getOpenid(),dto.getTs(), dto.getZoneId(), wxConfig.getMidasEnv());
        String postBody = JsonUtils.Object2Json(paramV2);
        String signature = calcSignature(postBody, sessionKey);
        String appKey = wxConfig.getMidasSecret();
        String paySig = calcPaySig(BALANCE_URI, postBody, appKey);
        String accessToken = wxApiService.authGetAccessTokenForMidas(wxConfig.getWxAppletAppId(), wxConfig.getWxAppletSecret());
        GetBalanceResultV2 balanceResultV2 = MidasPayUtil.getBalanceV2(signature,paySig,accessToken,postBody);

        if(balanceResultV2.getErrCode() != 0){
            log.error("【订单编号:{}】;调用微信接口出错:余额不足",orderInfo.getOrderNumber());
            throw new AppException(ErrorCode.PAY_WECHAT_INTERFACE_ERROR.code(), balanceResultV2.getErrMsg());
        }
        return getMidasBalanceV2VO(orderInfo, wxConfig, balanceResultV2);
    }

注意再经过wx.auth2Session()获取的wx.code只能使用一次,否者会出现 code been used..错误。所以再微信授权的时候把auth2Session返回的结果集中的sessionKey丢再redis中，通过hash结构来存储取出。

另外切记切记postbody中的Filed一定要加下划线来请求 !! （被这个无关紧要的问题给卡住了两天，最后发现是offerId要改为offer_id 微信那边才能识别出你的offer_id，不然识别不出!）


getBanlanceV2(2.0版本)
 

    /**
     * 虚拟支付2.0 【查询余额】
     *
     * 获取余额 pay_getBalance
     * POST https://api.weixin.qq.com/wxa/game/getbalance?access_token=ACCESS_TOKEN&signature=SIGNATURE&sig_method=SIG_METHOD&pay_sig=PAY_SIGNATURE
     *
     */
    public static GetBalanceResultV2 getBalanceV2(String signature, String paySig, String accessToken, String postBody) {
        // 0 米大师正式环境 1 米大师沙箱环境 https://api.weixin.qq.com/wxa/game/
        String url =  MIDAS_API_BASE_URL + "getbalance"
                                         + "?access_token="+accessToken
                                         + "&signature="+signature
                                         + "&pay_sig="+paySig;

        try {
            log.info("微信API:{}",url);
            HashMap<String, String> headers = new HashMap<>();
            headers.put("Content-Type", "application/json");
            log.info("body:{}",postBody);
            String postForm = HttpUtil.post(url, postBody, headers);
            log.info("返回参数:{}", postForm);
            return JSONObject.parseObject(postForm, GetBalanceResultV2.class);
        } catch (Exception e) {
            log.info("微信API:{},异常信息:{}", url, e);
            throw new AppException(ErrorCode.SYS_ERROR.code(), e.getMessage());
        }
    }

大家就作为一个参考吧!