微信生成带参数二维码(用户id), 扫码可获取用户id

生成带参数的二维码: https://developers.weixin.qq.com/doc/offiaccount/Account_Management/Generating_a_Parametric_QR_Code.html

示例代码: 

    /*** 生成带参数的二维码** @param userId    用户id* @return*/@GetMapping@RequestMapping("/createTicket/{userId}")public AjaxResult createTicket(@PathVariable Long userId){String ossUrl = ticketService.createTicket(userId);Map<String, String> map = new HashMap<>();map.put("ossUrl", ossUrl);return AjaxResult.success("操作成功", map);}

    /*** 生成带参数的二维码** @param userId    用户id* @return*/@Overridepublic String createTicket(Long userId) {if (userId == null) {userId = 0L;}String url = String.format("https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=%s",SpringUtils.getBean(AccessTokenUtils.class).getAccessToken());// 生成永久二维码String data = String.format("{\"action_name\": \"QR_LIMIT_SCENE\", \"action_info\": {\"scene\": {\"scene_id\": %d}}}", userId);// 发送POST请求获取ticketRestTemplate restTemplate = new RestTemplate();// {"ticket":"gQGi8TwAAAAAAAAAAS5odHRwOi8vd2VpeGluLnFxLmNvbS9xLzAyNGN1TzRPaU5jSkgxMDAwMHcwMzUAAgRoga9lAwQAAAAA","url":"http:\/\/weixin.qq.com\/q\/024cuO4OiNcJH10000w035"}String ticketResponse = restTemplate.postForObject(url, data, String.class);// 解析ticketJSONObject jsonObject = JSONObject.parseObject(ticketResponse);String ticket = jsonObject.getString("ticket");//  根据ticket获取二维码图片URLString ticketUrl = String.format("https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=%s", ticket);// 上传ossString ossUrl = ossUtils.strToInputStreamUpload(ticketUrl);log.info("生成的带参数二维码URL：" + ossUrl);return ossUrl;}

扫码接收事件推送:
https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Receiving_event_pushes.html

示例代码: 

    /*** 接收用户消息并回复消息** @param request       xml内容* @return              xml格式的字符串*/@PostMapping("/validateWeChatServer")public String receiveMessage(HttpServletRequest request) {return weChatService.receiveMessage(request);}

  /*** 接收用户消息并回复消息** @param request       xml内容* @return              xml格式的字符串*/@Overridepublic String receiveMessage(HttpServletRequest request) {ServletInputStream inputStream = null;try {inputStream = request.getInputStream();HashMap<String, String> map = new HashMap<>();SAXReader reader = new SAXReader();try {// 读取request输入流, 获取Document对象Document document = reader.read(inputStream);// 获取root节点Element root = document.getRootElement();// 获取所有的子节点List<Element> elements = root.elements();for (Element element : elements) {map.put(element.getName(), element.getText());}log.info("接收到的用户消息: {}", map);} catch (DocumentException e) {e.printStackTrace();} finally {if (inputStream != null) {try {inputStream.close();} catch (IOException e) {e.printStackTrace();}}}// 关注用户, 保存到数据库ResUser user = SpringUtils.getBean(IResUserService.class).attentionMedia(map.get("FromUserName"));// 回复消息String message = getReplyTextMessage(map, user);log.info("回复消息: {}", message);return message;} catch (IOException e) {e.printStackTrace();}return null;}

private String getReplyTextMessage(HashMap<String, String> map, ResUser user) {// 未关注用户时Event=subscribe, EventKey=qrscene_4(事件KEY值，qrscene_为前缀，后面是自定义的用户id)// 获取 "qrscene_" 后面的值Long userId = Long.valueOf(map.get("EventKey").substring("qrscene_".length()));// TODO}

接收到的用户消息: {Ticket=gQFC8TwAAAAAAAAAAS5odHRwOi8vd2VpeGluLnFxLmNvbS9xLzAyaWplQzQzaU5jSkgxMDAwME0wM3oAAgR6r7BlAwQAAAAA, CreateTime=1706078168, EventKey=qrscene_4, Event=subscribe, ToUserName=gh_da9c697c8555, FromUserName=oUjEt6xFAs2ABHsmLyJeSUe-WVXI, MsgType=event}