微信公众号带参二维码应用场景

1、淘客系统中的推荐人或代理记录

2、店家发票

3、店铺会员

4、硬件设备一物一码

下面介绍公众号淘客系统中推荐人及代理对临时二维码的应用

思路：

1、根据用户的unionid生成二维码

2、下载场景二维码到服务器

3、上传临时二维码到公众号图片空间，并获取到mediaId

4、通过菜单的click事件发送给用户

5、其它用户扫描场景二维码成为下级

关键代码

生成二维码

 /**
     * 换取二维码ticket
     *
     * @param access_token
     * @param terminal_user_id
     */
    public String getQrCode(String access_token, int terminal_user_id) {
        StringBuffer bufferUrl = new StringBuffer("https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=");
        bufferUrl.append(access_token);
        QrCodeDto qrCode = new QrCodeDto();
        qrCode.setAction_name("QR_SCENE");
        qrCode.setExpire_seconds(2592000);
        QrCodeDto.Action_infoEntity a = new QrCodeDto.Action_infoEntity();
        QrCodeDto.Action_infoEntity.SceneEntity s = new QrCodeDto.Action_infoEntity.SceneEntity();
        s.setScene_id(terminal_user_id);
        a.setScene(s);
        qrCode.setAction_info(a);
        Gson gson = new Gson();
        String qrCodeParameter = gson.toJson(qrCode);
        String qrTicketResult = HttpClientUtil.doPostJson(bufferUrl.toString(), qrCodeParameter);
        System.out.println("换取二维码得到的值为==>" + qrTicketResult);
        return qrTicketResult;
    }

下载二维码图片

  /**
     * @param ticket
     * @param imageName 需要保存的文件名，比如abc.jpg
     * @throws Exception
     * @Return 文件保存的路径 比如E:\fanbo2.0\123456.jpg
     */
    public static String dowloadImage(String ticket, String imageName) throws Exception {
        String wxUrl = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=" + ticket;
        LOGGER.debug("下载图片请求地址==>{}", wxUrl);
        //new一个URL对象
        URL url = new URL(wxUrl);
        //打开链接
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        //设置请求方式为"GET"
        conn.setRequestMethod("GET");
        //超时响应时间为5秒
        conn.setConnectTimeout(5 * 1000);
        //通过输入流获取图片数据
        InputStream inStream = conn.getInputStream();
        //得到图片的二进制数据，以二进制封装得到数据，具有通用性
        byte[] data = readInputStream(inStream);
        //new一个文件对象用来保存图片，默认保存当前工程根目录
        File imageFile = new File(imageName);
        //创建输出流
        FileOutputStream outStream = new FileOutputStream(imageFile);
        String imageFilePath = imageFile.getAbsolutePath();
        //写入数据
        outStream.write(data);
        //关闭输出流
        outStream.close();
        return imageFilePath;
    }

上传二维码图片

/**
     * 模拟表单进行多媒体传输
     *
     * @param fileName （文件名字）
     * @param filePath (文件内容)
     * @return
     * @throws Exception
     */
    public static String uploadMultimedia(String access_token, String fileName, String filePath) throws Exception {
        String requestUrl = "https://api.weixin.qq.com/cgi-bin/media/upload?type=image&access_token=" + access_token;
        String str = "";
        String result = null;
        File file = new File(filePath);
        if (!file.exists() || !file.isFile()) {
            throw new IOException("文件不存在");
        }
        try {
            URL url = new URL(requestUrl);
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            // 以Post方式提交表单，默认get方式
            con.setRequestMethod("POST");
            con.setDoInput(true);
            con.setDoOutput(true);
            // post方式不能使用缓存
            con.setUseCaches(false);
            // 设置请求头信息
            con.setRequestProperty("Connection", "Keep-Alive");
            con.setRequestProperty("Charset", "UTF-8");
            // 设置边界
            String BOUNDARY = "----------" + System.currentTimeMillis();
            con.setRequestProperty("Content-Type",
                    "multipart/form-data; boundary=" + BOUNDARY);
            StringBuilder sb = new StringBuilder();
            // 必须多两道线
            sb.append("--");
            sb.append(BOUNDARY);
            sb.append("\r\n");
            sb.append("Content-Disposition: form-data;name=\"file\";filename=\""
                    + fileName + "\"\r\n");
            sb.append("Content-Type:application/octet-stream\r\n\r\n");
            byte[] head = sb.toString().getBytes("utf-8");
            OutputStream out = new DataOutputStream(con.getOutputStream());
            out.write(head);
            DataInputStream in = new DataInputStream(new FileInputStream(file));
            int bytes = 0;
            byte[] bufferOut = new byte[1024];
            while ((bytes = in.read(bufferOut)) != -1) {
                out.write(bufferOut, 0, bytes);
            }
            in.close();
            byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定义最后数据分隔线
            out.write(foot);
            out.flush();
            out.close();
            StringBuffer buffer = new StringBuffer();
            BufferedReader reader = null;
            try {
                reader = new BufferedReader(new InputStreamReader(
                        con.getInputStream()));
                String line = null;
                while ((line = reader.readLine()) != null) {
                    buffer.append(line);
                }
                if (result == null) {
                    result = buffer.toString();
                }
            } catch (IOException e) {
                LOGGER.info("上传图片至微信临时空间出现异常==>{}", e);
                e.printStackTrace();
                throw new IOException("数据读取异常");
            } finally {
                if (reader != null) {
                    reader.close();
                }
            }
            str = buffer.toString();
            LOGGER.info("上传图片后返回后的字符串==>{}", str);
        } catch (Exception e) {
            throw new Exception(e.getMessage());
        }
        return str;
    }