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二维码收款——后端API

后端使用springboot

API流程见下图，手机画图，见谅

用户通过微信公众号授权获取其openid，微信支付需要使用openid，授权的流程等同于登录，授权完成后将openid写入session表示登录成功，后面接口通信基于session验证是否登录
用户端输入金额后发起支付请求，接口 /create/pay/order
服务端收到支付请求后创建本系统订单并持久化，然后向微信支付统一下单接口发起请求获取微信支付必要参数，获取参数后返回给客户端（/create/pay/order接口的返回）
用户端（微信中）收到/create/pay/order接口的返回，本地拉起微信支付，用户支付成功
用户支付成功后，微信支付服务器会通知我的服务端，服务端将本系统订单状态修改为已支付，同时将订单支付成功的信息发送给语音播报程序（语音播报装在电脑上通过socket与服务端连接）

注：服务端提供websocket服务，用于和语音播报程序长连接

按流程顺序，核心代码如下：

登录验证，通过springboot拦截器实现，拦截器类代码

@Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        logger.info("请求dump：{}", WebUtil.dumpRequest(request));
        String servletPath = WebUtil.getServletPathWithParam(request);
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }
        //进入拦截处理逻辑
        final HandlerMethod handlerMethod = (HandlerMethod) handler;
        final Class<?> clazz = handlerMethod.getBeanType();
        final Method method = handlerMethod.getMethod();
        //a.终端用户登录
        if (clazz.isAnnotationPresent(LoginUserRequired.class) || method.isAnnotationPresent(LoginUserRequired.class)) {
            LoginUserBean userBean = AuthHelper.getUserBean(request);
            logger.info("微信网页端登录：request中的用户=>{}", userBean);
            //如果request中已经有用户对象
            if (userBean != null) {
                return true;
            }
            logger.info("微信网页登录失效，请重新授权");
            //ajax请求返回json
            if (WebUtil.isAjaxRequest(request)) {
                String s = APIUtil.getReturn(401, "请重新登录");
                response.setContentType("application/json;charset=UTF-8");
                response.getWriter().print(s);
            } else {
                //跳转到微信授权的页面
                String referer = Base64.encodeBase64String(servletPath.getBytes(StandardCharsets.UTF_8));
                response.sendRedirect("/c/auth/wechat?referer=" + referer);
            }
            return false;
        }
　　　　return false;
}

微信授权代码（/c/auth/wechat接口），Controller中

/**
     * 终端用户微信网页登录
     * @param code
     * @param state
     * @param referer base64编码的原始请求链接，带有全部get参数
     * @return
     */
    @RequestMapping(value = "/c/auth/wechat")
    public Object wxLogin(String code, String state, String referer, HttpServletRequest request,
            HttpServletResponse response) throws UnsupportedEncodingException {
        Object result;
        logger.info("微信登录 code=>{}, state=>{}, referer=>{}", code, state, referer);
        LoginUserBean userBean = AuthHelper.getUserBean(request);
        if (userBean != null) {
            logger.info("已经登录成功，无需再次微信授权，{}", userBean);
            if (StringUtils.isBlank(referer)) {
                result = new MsgTipsView(MsgTipsView.Level.INFO, "提示", "已经登录");
            } else {
                referer = new String(Base64.decodeBase64(referer));
                result = "redirect:" + referer;
            }
            return result;
        }
        //微信授权第一次请求
        if (StringUtils.isAnyBlank(code, state)) {
            //authBackURL的host必须与微信后台设置的相同
            String basePath = appConf.getApiHost();
            String authBackURL = basePath + "/c/auth/wechat?referer=" + referer;
            try {
                authBackURL = URLEncoder.encode(authBackURL, "utf-8");
            } catch (Exception e) {
                logger.error("URLEncode错误, URL: {}, error: {}", authBackURL, e.getMessage());
            }
            logger.debug("authBackURL: " + authBackURL);
            String rand = RandomStringUtils.randomAlphanumeric(5);
            String wxAuthURL = gzhApiService.getWxGZHApiModule().gzhWebAuthURL(authBackURL, rand, "snsapi_base");
            result = "redirect:" + wxAuthURL;
            return result;
        }
        //微信授权完成，通过code获取用户信息
        WeixinUserInfo userInfo = gzhApiService.getWxGZHApiModule().getWeixinIDByAuth2Code(code, "snsapi_base");
        logger.info("获取的微信用户信息: {}", userInfo);
        if (userInfo == null) {
            result = new MsgTipsView(MsgTipsView.Level.ERROR, "微信登录", "获取微信信息失败");
            return result;
        }
        //获取openid成功，写入session以表示登录
        userBean = new LoginUserBean(userInfo.getOpenid());
        AuthHelper.writeUserBean(request, userBean);
        if (StringUtils.isBlank(referer)) {
            return new MsgTipsView(MsgTipsView.Level.SUCCESS, "登录成功", "登录成功");
        }
        //恢复最开始请求的页面
        return "redirect:" + new String(Base64.decodeBase64(referer));
    }

本系统创建订单(/create/pay/order接口)

/**
     * 创建支付订单
     * @param orderParam   支付订单所需的参数 {'mercNo': 'xxx','amount': '订单金额', 'memo': '订单备注', 'channel': '支付通道'}
     * @return 客户端实际支付所需的参数
     */
    @PostMapping(value = "/a/create/pay/order")
    @ResponseBody
    @LoginUserRequired
    public String createPayOrder(@RequestBody Map<String, String> orderParam, LoginUserBean userBean,
            HttpServletRequest request) {
        String openid = userBean.getWxOpenid();
        String mercNo = orderParam.getOrDefault("mercNo", "");
        String payChannel = orderParam.getOrDefault("channel", "");
        BigDecimal orderAmount = new BigDecimal(orderParam.getOrDefault("amount", "0.00"));
        String orderMemo = orderParam.getOrDefault("memo", "");
        //验证参数
        RMerc merc;
        if ((merc = mercService.selectMerc(mercNo)) == null) {
            return APIUtil.getReturn(1, "商户号不存在");
        }
        List<String> availableChannels = ImmutableList.of("wxpay");
        if (!availableChannels.contains(payChannel)) {
            return APIUtil.getReturn(1, "不支持的支付通道");
        }
        if (orderAmount.compareTo(BigDecimal.ZERO) <= 0 || orderAmount.scale() > 2) {
            return APIUtil.getReturn(1, "金额格式错误");
        }
        //微信支付
        if ("wxpay".equals(payChannel)) {
            RPayOrder order = payOrderService.createOrderAndSave(openid, mercNo, orderAmount, "wxpay", orderMemo);
            logger.info("创建支付订单：{}", JSON.toJSONString(order));
            //构造微信统一下单API所需的参数
            String orderId = order.getOrderId();
            int fee = orderAmount.multiply(new BigDecimal(100)).intValue();
            String ip = WebUtil.getRealIp(request);
            String notifyURL = getPayNotifyURL();
            GZHWxpayModule module = gzhApiService.getGzhWxpayModule();
            WxpayModule wxpayModule = module.getWxpayModule();
            String body = String.format("支付订单%s%s", orderId, StringUtils.isNotBlank(orderMemo) ? ":" + orderMemo : "");
            SortedMap<String, String> ret = wxpayModule.getJsApiPayParam(module.getAppid(), openid, orderId, body, fee,
                    ip, notifyURL);
            if (CollectionUtils.isEmpty(ret)) {
                return APIUtil.getReturn(1, "系统错误");
            }
            return APIUtil.getReturn(APIConst.OK, ret);
        }
        return APIUtil.getReturn(1, "不支持的支付通道");
    }

微信端拉起微信支付代码，见前一篇文章pay.js中代码

微信支付成功后，微信支付系统回调我们的服务端

/**
     * 微信支付回调通知
     * @param content   post的内容
     * @return 响应给微信支付的文本
     */
    @PostMapping(value = "/c/wxpay/notify")
    @ResponseBody
    public String wxpayNotifyBack(@RequestBody String content) {
        String resp = PayCommonUtil.setXML("FAIL", "exception");
        try {
            Map<String, String> resMap = XMLUtil.doXMLParse(content);
            logger.info("微信支付回调通知：{}", resMap);
            if (resMap == null) {
                resp = "请求内容非法";
                throw new RuntimeException("请求内容格式错误");
            }
            WxpayModule module = gzhApiService.getGzhWxpayModule().getWxpayModule();
            //验证签名
            if (!module.checkSignValid(resMap)) {
                resp = PayCommonUtil.setXML("FAIL", "invalid sign");
                throw new RuntimeException("签名错误");
            }
            String resCode = resMap.get("return_code");
            String bizCode = resMap.get("result_code");
            if ("FAIL".equals(resCode) || "FAIL".equals(bizCode)) {
                logger.error("微信回调失败：{}", content);
                resp = PayCommonUtil.setXML("FAIL", "weixin pay fail");
                throw new RuntimeException("微信回调系统错误");
            }
            if (!"SUCCESS".equals(bizCode)) {
                logger.error("微信支付系统业务错误：{}", content);
                throw new RuntimeException("微信支付系统业务错误");
            }
            //------------支付成功----------------
            // 业务系统的订单号
            String outTradeNo = resMap.get("out_trade_no");
            // 微信支付的订单号
            String transactionId = resMap.get("transaction_id");
            // 支付金额（分）
            int totalFee = Integer.parseInt(resMap.get("total_fee"));
            //调用内部处理
            doActionWithWhenPaySuccess(outTradeNo, transactionId, totalFee);
            //给微信支付接口返回成功
            resp = PayCommonUtil.setXML("SUCCESS", "OK");
        } catch (Exception e) {
            logger.error("微信支付回调异常：{}，{}", content, e.getMessage());
        }
        return resp;
    }

    /**
     * 支付成功后处理业务逻辑
     * @param outTradeNo        业务系统订单号
     * @param transactionId     支付方单号
     * @param totalFee          实际支付金额，分
     */
    private void doActionWithWhenPaySuccess(String outTradeNo, String transactionId, int totalFee) {
        RPayOrder order = payOrderService.queryById(outTradeNo);
        if (order == null || order.getOrderStatus() > 0) {
            return;
        }
        //验证实际支付的金额
        BigDecimal payAmount = new BigDecimal(totalFee).divide(new BigDecimal(100), 2, RoundingMode.UNNECESSARY);
        if (order.getAmount().compareTo(payAmount) != 0) {
            logger.info("实际支付金额与订单金额不符，订单：{}，实际支付金额：{}元，订单金额：{}元", order.getOrderId(), payAmount, order.getAmount());
            return;
        }
        //填入支付信息，让回调队列去处理
        order.setPayOrderId(transactionId);
        order.setOrderStatus(1);
        orderCallbackTaskService.putTask(order);
    }

OrderCallbackTaskService类专门用于订单支付成功后处理

/**
 * 订单支付完成后回调任务服务
 */
@Service
public class OrderCallbackTaskService implements CommandLineRunner {
    private final Logger logger = LoggerFactory.getLogger(OrderCallbackTaskService.class);

    private LinkedBlockingDeque<RPayOrder> callbackOrderQueue = new LinkedBlockingDeque<>();
    @Resource private ThreadPoolTaskExecutor taskExecutor;
    @Resource private RPayOrderService payOrderService;

    @Override
    public void run(String... args) throws Exception {
        taskExecutor.execute(() -> {
            boolean exit = false;
            while (!exit) {
                try {
                    RPayOrder order = callbackOrderQueue.take();
                    //1. 支付成功，更新订单状态
                    updateOrderStatus(order);
                } catch (InterruptedException e) {
                    logger.error("订单回调队列中断");
                    exit = true;
                }
            }
        });
    }

    /**
     * 向队列加入一个任务
     * @param order 订单
     */
    @SneakyThrows
    public void putTask(RPayOrder order) {
        callbackOrderQueue.put(order);
    }

    /**
     * 更新订单的状态
     * @param order 订单
     */
    private void updateOrderStatus(RPayOrder order) {
        boolean s = payOrderService.updatePayInfo(order.getOrderId(), order.getPayOrderId(), order.getOrderStatus());
        if (s) {
            //发送通知
            pushNotice(order);
        }
    }

    /**
     * 推送通知
     * @param order
     */
    private void pushNotice(RPayOrder order) {
        //给语音播报设备发送通知
        WebSocketService.sendMessage(order.getMercNo(), new RefuWsMessage<>("order", order));
    }
}

Java端websocket服务比较简单，参考文章很多