微信收款码和支付宝收款码二合一小程序

一.前端是微信小程序，后端java

二.这里讲述后端

客户扫描二维码区分来源是支付宝还是微信，然后做不同的处理；

    @GetMapping("/{openid}/{codeId}")    public void scan(        @PathVariable String openid,        @PathVariable Long codeId,        HttpServletRequest request, HttpServletResponse response, Model model) throws Exception {                final Code code = codeRepository.findByIdAndUserOpenid(codeId, openid);        String agent = request.getHeader("User-Agent").toLowerCase();                if (agent.indexOf("micromessenger") > 0) {                        QrCodeUtil.encode(code.getWx(), code.getName(), response.getOutputStream());        } else if (agent.indexOf("alipayclient") > 0) {                        response.sendRedirect(code.getAlipay());        }else {            response.sendRedirect(code.getAlipay());        }    }

如果是支付宝则直接重定向；
如果是微信则根据微信收款码的地址生成二维码；以下是生成二维码的代码：

    private static final String CHARSET = "utf-8";    private static final String FORMAT = "PNG";    // 二维码尺寸      private static final int BG_WIDTH = 320;    private static final int BG_HEIGHT = 570;    private static final int QRCODE_SIZE = 200;    private static BufferedImage createBg(String name) throws Exception {                BufferedImage image = new BufferedImage(BG_WIDTH, BG_HEIGHT, BufferedImage.TYPE_INT_RGB);           Graphics2D g2 = (Graphics2D)image.getGraphics();           g2.setBackground(new Color(92,147,240));        g2.clearRect(0, 0, BG_WIDTH, BG_HEIGHT);           g2.setPaint(Color.WHITE);        byte[] title = new String("长按二维码识别付款").getBytes("utf-8");        Font font1 = new Font("SimHei", Font.BOLD, 25);        g2.setFont(font1);        double x1 = (BG_WIDTH - QRCODE_SIZE) / 2;           double y1 = (BG_HEIGHT - QRCODE_SIZE) / 4;          g2.drawString(new String(title), (int)x1, (int)y1);                Font font = new Font("SimHei", Font.PLAIN, 10);        if(name == null || name.isEmpty()) {            name = "***";        }         name = "向 " + name + " 付款";        byte[] names = new String(name).getBytes("utf-8");        double x = (BG_WIDTH - QRCODE_SIZE);           double y = BG_HEIGHT - (BG_HEIGHT - QRCODE_SIZE) / 3 - 15;        Graphics2D g3 = (Graphics2D)image.getGraphics();           g3.drawString(new String(names), (int)x, (int)y);           g3.setFont(font);        return image;    }        private static BufferedImage createQrcode(String url) throws Exception {        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);        hints.put(EncodeHintType.MARGIN, 2);        BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);        int width = bitMatrix.getWidth();        int height = bitMatrix.getHeight();        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);        for (int x = 0; x < width; x++) {            for (int y = 0; y < height; y++) {                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);            }        }        return image;    }    /**     * 插入二维码     * @param bgImge 背景图片     * @param qrcode 二维码     * @return     * @throws Exception     */    private static BufferedImage insertImage(BufferedImage bgImge, Image qrcode) throws Exception {        int width = qrcode.getWidth(null);        int height = qrcode.getHeight(null);        // 插入二维码        Graphics2D graph = bgImge.createGraphics();        int x = (BG_WIDTH - width) / 2;        int y = (BG_HEIGHT - height) / 2;        graph.drawImage(qrcode, x, y, width, height, null);        graph.dispose();                return bgImge;    }    /**     * 生成二维码(外嵌北京)      * @param content     * @param logoPath     * @param output     * @throws Exception     */    public static void encode(String content, String name, OutputStream output) throws Exception {         BufferedImage bgImage = QrCodeUtil.createBg(name);        BufferedImage qrcode = QrCodeUtil.createQrcode(content);                BufferedImage image = QrCodeUtil.insertImage(bgImage, qrcode);                ImageIO.write(image, FORMAT, output);    }