扫码支付服务

public interface XcPayRecordService extends IService<XcPayRecord> {

    /**
     * 根据交易编号查询记录
     *
     * @param payNo 交易编号
     * @return com.swx.orders.model.po.XcPayRecord 支付记录
     */
    XcPayRecord getOneByPayNo(String payNo);
}

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author sw-code
 * @since 2023-09-04
 */
@Service
public class XcPayRecordServiceImpl extends ServiceImpl<XcPayRecordMapper, XcPayRecord> implements XcPayRecordService {

    /**
     * 根据交易编号查询记录
     *
     * @param payNo 交易编号
     * @return com.swx.orders.model.po.XcPayRecord 支付记录
     */
    @Override
    public XcPayRecord getOneByPayNo(String payNo) {
        return getOne(Wrappers.<XcPayRecord>lambdaQuery().eq(XcPayRecord::getPayNo, payNo));
    }
}

@ApiOperation("扫码下单接口")
@RequestMapping("/requestpay")
public void requestPay(String payNo, HttpServletResponse httpResponse) throws IOException {
    // 判断支付记录号是否存在
    XcPayRecord xcPayRecord = xcPayRecordService.getOneByPayNo(payNo);
    if (xcPayRecord == null) {
        throw new BizException("支付记录不存在");
    }
    if (xcPayRecord.getStatus().equals("601002")) {
        // 该支付记录已成功支付
        throw new BizException("已支付，无需重复支付");
    }
    // 发起支付请求
    AlipayClient alipayClient = new DefaultAlipayClient(AlipayConfig.URL, APP_ID, APP_PRIVATE_KEY, AlipayConfig.FORMAT, AlipayConfig.CHARSET, ALIPAY_PUBLIC_KEY, AlipayConfig.SIGNTYPE);
    AlipayTradeWapPayRequest request = new AlipayTradeWapPayRequest();
    // 异步接收地址，仅支持http/https，公网可访问
    request.setNotifyUrl(NOTIFY_URL);
    /******必传参数******/
    JSONObject bizContent = new JSONObject();
    //商户订单号，商家自定义，保持唯一性
    bizContent.put("out_trade_no", payNo);
    //支付金额，最小值0.01元
    bizContent.put("total_amount", xcPayRecord.getTotalPrice());
    //订单标题，不可使用特殊符号
    bizContent.put("subject", xcPayRecord.getOrderName());

    /******可选参数******/
    //手机网站支付默认传值FAST_INSTANT_TRADE_PAY
    bizContent.put("product_code", "QUICK_WAP_WAY");

    request.setBizContent(bizContent.toString());
    String form = "";
    try {
        form = alipayClient.pageExecute(request).getBody();
    } catch (AlipayApiException e) {
        e.printStackTrace();
        throw new BizException("拉取支付宝支付失败");
    }
    httpResponse.setContentType("text/html;charset=" + AlipayConfig.CHARSET);
    httpResponse.getWriter().write(form);
    httpResponse.getWriter().flush();
}