一、生成微信支付二维码

1、编写controller

@RestController
@RequestMapping("/orderservice/log")
@CrossOrigin
public class PayLogController {

    @Autowired
    private PayLogService payService;
    /**
     * 生成二维码
     *
     * @return
     */
    @GetMapping("/createNative/{orderNo}")
    public R createNative(@PathVariable String orderNo) {
        Map map = payService.createNative(orderNo);
        return R.ok().data(map);
    }
}

2、编写service

@Service
public class PayLogServiceImpl extends ServiceImpl<PayLogMapper, PayLog> implements PayLogService {

    @Autowired
    private TOrderService orderService;
    
    @Override
    public Map createNative(String orderNo) {
        try {
            //根据订单id获取订单信息
            QueryWrapper<TOrder> wrapper = new QueryWrapper<>();
            wrapper.eq("order_no",orderNo);
            TOrder order = orderService.getOne(wrapper);

            Map m = new HashMap();
            //1、设置支付参数
            m.put("appid", "wx74862e0dfcf69954");
            m.put("mch_id", "1558950191");
            m.put("nonce_str", WXPayUtil.generateNonceStr());
            m.put("body", order.getCourseTitle());
            m.put("out_trade_no", orderNo);
            m.put("total_fee", order.getTotalFee().multiply(new BigDecimal("100")).longValue()+"");
            m.put("spbill_create_ip", "127.0.0.1");
            m.put("notify_url", "http://guli.shop/api/order/weixinPay/weixinNotify\n");
            m.put("trade_type", "NATIVE");

            //2、HTTPClient来根据URL访问第三方接口并且传递参数
            HttpClient client = new HttpClient("https://api.mch.weixin.qq.com/pay/unifiedorder");

            //client设置参数
            client.setXmlParam(WXPayUtil.generateSignedXml(m, "T6m9iK73b0kn9g5v426MKfHQH7X8rKwb"));
            client.setHttps(true);
            client.post();
            //3、返回第三方的数据
            String xml = client.getContent();
            Map<String, String> resultMap = WXPayUtil.xmlToMap(xml);
            //4、封装返回结果集

            Map map = new HashMap<>();
            map.put("out_trade_no", orderNo);
            map.put("course_id", order.getCourseId());
            map.put("total_fee", order.getTotalFee());
            map.put("result_code", resultMap.get("result_code"));
            map.put("code_url", resultMap.get("code_url"));

            //微信支付二维码2小时过期，可采取2小时未支付取消订单
            //redisTemplate.opsForValue().set(orderNo, map, 120, TimeUnit.MINUTES);
            return map;
        } catch (Exception e) {
            e.printStackTrace();
            return new HashMap<>();
        }
    }
}

二、获取支付状态接口

1、编写controller

@GetMapping("/queryPayStatus/{orderNo}")
public R queryPayStatus(@PathVariable String orderNo) {
    //调用查询接口
    Map<String, String> map = payService.queryPayStatus(orderNo);
    if (map == null) {//出错
        return R.error().message("支付出错");
    }
    if (map.get("trade_state").equals("SUCCESS")) {//如果成功
        //更改订单状态
        payService.updateOrderStatus(map);
        return R.ok().message("支付成功");
    }

    return R.ok().code(25000).message("支付中");
}

2、编写service，更新订单状态

@Override
public void updateOrderStatus(Map<String, String> map) {
    //获取订单id
    String orderNo = map.get("out_trade_no");
    //根据订单id查询订单信息
    QueryWrapper<TOrder> wrapper = new QueryWrapper<>();
    wrapper.eq("order_no",orderNo);
    TOrder order = orderService.getOne(wrapper);
    
    if(order.getStatus().intValue() == 1) return;
    order.setStatus(1);
    orderService.updateById(order);

    //记录支付日志
    PayLog payLog=new PayLog();
    payLog.setOrderNo(order.getOrderNo());//支付订单号
    payLog.setPayTime(new Date());
    payLog.setPayType(1);//支付类型
    payLog.setTotalFee(order.getTotalFee());//总金额(分)
    payLog.setTradeState(map.get("trade_state"));//支付状态
    payLog.setTransactionId(map.get("transaction_id"));
    payLog.setAttr(JSONObject.toJSONString(map));
    baseMapper.insert(payLog);//插入到支付日志表
}


    @Override
    public Map queryPayStatus(String orderNo) {
        try {
            //1、封装参数
            Map m = new HashMap<>();
            m.put("appid", "wx74862e0dfcf69954");
            m.put("mch_id", "1558950191");
            m.put("out_trade_no", orderNo);
            m.put("nonce_str", WXPayUtil.generateNonceStr());

            //2、设置请求
            HttpClient client = new HttpClient("https://api.mch.weixin.qq.com/pay/orderquery");
            client.setXmlParam(WXPayUtil.generateSignedXml(m, "T6m9iK73b0kn9g5v426MKfHQH7X8rKwb"));
            client.setHttps(true);
            client.post();
            //3、返回第三方的数据
            String xml = client.getContent();
            Map<String, String> resultMap = WXPayUtil.xmlToMap(xml);
            //6、转成Map
            //7、返回
            return resultMap;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }