创建支付订单

到课程git项目中下载银联SDK和相关数字证书文件，按照说明文档，设置后端Java项目。

创建UnionPayController.java

@RestController
@RequestMapping("/app/unionpay")
@Api("银联业务接口")
public class UnionPayController {
    @Autowired
    private SDKConfig config;

    @Autowired
    private AcpService acpService;

    @Value("${application.unionpay.mch-id}")
    private String mchId;

    @Value("${application.unionpay.frontUrl}")
    private String frontUrl;

    @Value("${application.unionpay.backUrl}")
    private String backUrl;

    @Value("${application.unionpay.orderUrl}")
    private String orderUrl;

    @Value("${application.unionpay.wapFrontUrl}")
    private String wapFrontUrl;

    @Autowired
    private RedisUtils redisUtils;

    @Autowired
    private UserService userService;

    @Autowired
    private OrderService orderService;

    @Autowired
    private JwtUtils jwtUtils;

    @Login
    @PostMapping("/wapPayOrder")
    @ApiOperation("Wap付款")
    public R wapPayOrder(@RequestBody PayOrderForm form, @RequestHeader HashMap header) {
        ValidatorUtils.validateEntity(form);
        String token = header.get("token").toString();
        Long userId = Long.parseLong(jwtUtils.getClaimByToken(token).getSubject());
        int orderId = form.getOrderId();
        UserEntity user = new UserEntity();
        user.setUserId(userId);
        QueryWrapper wrapper = new QueryWrapper(user);
        long count = userService.count(wrapper);
        if (count == 0) {
            return R.error("用户不存在");
        }

        OrderEntity order = new OrderEntity();
        order.setUserId(userId.intValue());
        order.setId(orderId);
        order.setStatus(1);
        wrapper = new QueryWrapper(order);
        count = orderService.count(wrapper);
        if (count == 0) {
            return R.error("不是有效的订单");
        }
        //验证购物券是否有效
        //验证团购活动是否有效

        order = new OrderEntity();
        order.setId(orderId);
        wrapper = new QueryWrapper(order);
        order = orderService.getOne(wrapper);
        //向银联平台发出请求，创建支付订单
        String amount = order.getAmount().multiply(new BigDecimal("100")).intValue() + "";

        try {
            Map<String, String> requestData = new HashMap<String, String>();
            requestData.put("version", "5.0.0");    //版本号，全渠道默认值
            requestData.put("encoding", "UTF-8");  //字符集编码，可以使用UTF-8,GBK两种方式
            requestData.put("signMethod", "01"); //签名方法
            requestData.put("txnType", "01");  //交易类型 ，01：消费
            requestData.put("txnSubType", "01");  //交易子类型， 01：自助消费
            requestData.put("bizType", "000201");  //业务类型，B2C网关支付，手机wap支付
            requestData.put("channelType", "07");  //渠道类型；07：PC,平板  08：手机
            requestData.put("merId", mchId);       //商户号码
            requestData.put("accessType", "0");    //接入类型，0：直连商户
            requestData.put("orderId", order.getCode());  //商户订单号
            //订单发送时间，取系统时间，格式为YYYYMMDDhhmmss，必须取当前时间，否则会报txnTime无效
            requestData.put("txnTime", new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()));
            requestData.put("currencyCode", "156");  //交易币种（境内商户一般是156 人民币）
            requestData.put("txnAmt", amount);  //交易金额，单位分，不要带小数点
            requestData.put("frontUrl", wapFrontUrl);
            requestData.put("backUrl", backUrl);
            requestData.put("payTimeout", new SimpleDateFormat("yyyyMMddHHmmss").format(new Date().getTime() + 15 * 60 * 1000));
            //数字签名
            Map<String, String> submitFromData = acpService.sign(requestData, "UTF-8");
            String requestFrontUrl = config.getFrontRequestUrl();
            String htmlCode = AcpService.createAutoFormHtml(requestFrontUrl, submitFromData, "UTF-8");
            //未完待续

        } catch (Exception e) {
            e.printStackTrace();
            return R.error("银联支付模块故障");
        }
    }
}