生成小程序二維碼

生成小程序的官方文檔地址：https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/qr-code/wxacode.getUnlimited.html

功能代碼塊：

@RequestMapping("createWxTinyCode")
    public ResponseEntity<String> createWxTinyCode(@BCurrentUser EnterpriseUserinfo enterpriseUserinfo, Integer type,
                                                   Integer width, String page, String typeUrl, Integer storeId) {
        log.info("創建小程序二維碼，type:{},width:{},page:{},typeUrl:{},storeId:{}", type, width, page, typeUrl, storeId);
        Assert.notNull(page, "地址不能爲空");
        try {
            String accessToken = cacheService.get(CacheKeyConstants.WEIXIN_AUTHORIZED_ACCESS_TOKEN + ModuleConstants.WEIXIN_TINY_APPID);
            log.info("accessToken：{}", accessToken);
            JSONObject paramJson = new JSONObject();
            paramJson.put("width", width);
            String urlStr = "";
            if (type == null) {
                type = 1;
            }
            // 生成小程序碼
            if (1 == type) {
                // 接口B：適用於需要的碼數量極多的業務場景
                // api地址：https://developers.weixin.qq.com/miniprogram/dev/api/qrcode.html
                JSONObject json = new JSONObject();
                json.put("typeUrl", typeUrl);
                json.put("storeId", storeId);
                String param = storeId + "";
                if (typeUrl != null) {
                    param += "#" + typeUrl;
                }
                

                log.info("小程序請求參數:{}", param);
                urlStr = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=";
                paramJson.put("scene", param);
                paramJson.put("page", page);
                paramJson.put("auto_color", false);
                JSONObject line_color = new JSONObject();
                line_color.put("r", 0);
                line_color.put("g", 0);
                line_color.put("b", 0);
                paramJson.put("line_color", line_color);
            } else {
                // 生成小程序二維碼
                paramJson.put("path", page);
                urlStr = "https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=";
            }

            URL url = new URL(urlStr + accessToken);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");// 提交模式
            // 發送POST請求必須設置如下兩行
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            // 獲取URLConnection對象對應的輸出流
            PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
            // 發送請求參數
            printWriter.write(paramJson.toString());
            // flush輸出流的緩衝
            printWriter.flush();
            printWriter.close();

            String picUrl = DOWNLOAD_TEMP_FOLDER + "/smallCode_" + System.currentTimeMillis() + ".png";
            BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream());
            OutputStream os = new FileOutputStream(new File(picUrl));
            int len;
            byte[] arr = new byte[1024];
            while ((len = bis.read(arr)) != -1) {
                os.write(arr, 0, len);
                os.flush();
            }
            os.close();
            InputStream in = null;
            byte[] data = null;
            // 讀取圖片字節數組
            try {
                in = new FileInputStream(picUrl);
                data = new byte[in.available()];
                in.read(data);
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            String res = new String(Base64.encodeBase64(data));

            log.info("base64 res:{}", res);
            new File(picUrl).delete();
            return ReqResultUtil.genSuccessResultResponse(res);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

 注意點：sence 參數  { 最大32個可見字符，只支持數字，大小寫英文以及部分特殊字符：!#$&'()*+,/:;=?@-._~，其它字符請自行編碼爲合法字符（因不支持%，中文無法使用 urlencode 處理，請使用其他編碼方式）}