微信公眾號開發(fā)中，微商商城系統(tǒng)經(jīng)常會碰到要求系統(tǒng)自動生成授權(quán)圖片，試想如果會員較多，一個個手工處理費時費力。

一般會有如下要求：
自定義背景圖
附帶二維碼
附帶文字信息

 public String genQrcode(TMember member) throws Exception {
        /** 生成二維碼，用于圖片合并 */
        String url = WebConstants.PATH + "ucenter/member/inviteScan.do?inviteId=" + member.getId();
        String logo = ContextUtil.getRealPath() + "/theme/wd/images/qrcode_logo.png";
        String desDir = WebConstants.WEB_ROOT + "upload/code/";
        String fileName = "code_" + member.getId() + ".jpg";
        QRCodeUtil.encode(url, logo, desDir, fileName, true);
        /** 生成推廣圖 */
        String shareName = "share_" + member.getId() + ".jpg";
        String qrcodeBg = ContextUtil.getRealPath() + "/theme/wd/images/qrcode_bg.png";
        BufferedImage image1 = ImageIO.read(new File(qrcodeBg));
        BufferedImage image2 = ImageIO.read(new File(WebConstants.WEB_ROOT + "upload/code/" + fileName));
        BufferedImage combined = new BufferedImage(image1.getWidth(), image1.getHeight(), BufferedImage.TYPE_INT_RGB);
        // paint both images, preserving the alpha channels
        Graphics g = combined.getGraphics();
        g.drawImage(image1, 0, 0, null);
        g.drawImage(image2, 95, 600, 150, 150, null);
        // paint both images, preserving the alpha channels
        String uname = member.getUname();
        Calendar cal = Calendar.getInstance();
        cal.setTime(member.getInputDate());
        cal.add(Calendar.YEAR, 3);
        Font font = new Font("微軟雅黑", Font.BOLD, 16);
        Color color = new Color(0, 0, 0);
        g.drawImage(image1, 0, 0, null);
        g.setFont(font);
        g.setColor(color);
        g.drawString(uname, 200, 385);
        g.drawString(DateUtils.formatShortDate(cal.getTime()), 191, 495);
        g.drawString(member.getOpenid(), 191, 525);
        // Save as new image
        ImageIO.write(combined, "JPG", new File(desDir, shareName));
        return "upload/code/" + shareName;
    }