1.生成二维码

	public static byte[] generateQRCodeImages(String text, int width, int height) throws WriterException, IOException {String binary = null;QRCodeWriter qrCodeWriter = new QRCodeWriter();//调整白边大小Hashtable<EncodeHintType, Object> hints = new Hashtable<>();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");hints.put(EncodeHintType.MARGIN, 1);BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height,hints);//BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height);//bitMatrix = deleteWhite(bitMatrix);ByteArrayOutputStream out = new ByteArrayOutputStream();MatrixToImageWriter.writeToStream(bitMatrix,"PNG",out);byte[] byteArray = out.toByteArray();/*ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(out.toByteArray());byte[] bytes = new byte[out.size()];byteArrayInputStream.read(bytes);BASE64Encoder encoder = new BASE64Encoder();String base64 = encoder.encode(bytes);*/return byteArray;}

2.合并海报

public static void merge(String backGroundImageUrl, /*String qrCodeUrl*/byte[] buf, HttpServletResponse response) {String title="全平台累计中奖100000人";int size = 35;// 添加字体的属性设置Font font = new Font("黑体", Font.BOLD, size);try {//加载背景图片(也就是模板图)BufferedImage backGroundImage = ImageIO.read(Objects.requireNonNull(getInputStreamByGet(backGroundImageUrl)));//加载二维码图片(也就是需要合成到模板图上的图片)//BufferedImage imageCode = ImageIO.read(new File(qrCodeUrl));BufferedImage imageCode = ImageIO.read(new ByteArrayInputStream(buf));//把背景图片当做为模板Graphics2D graphics = backGroundImage.createGraphics();//在模板上绘制图象(需要绘图的图片,左边距,上边距,图片宽度,图片高度,图像观察者)同一个模板一般是不会变的//graphics.drawImage(imageCode, 30, 30, 20, 20, null);int width = Math.min(imageCode.getWidth(null), backGroundImage.getWidth() * 5 / 10);int height = imageCode.getHeight(null) > backGroundImage.getHeight() * 5 / 10 ? (backGroundImage.getHeight() * 5 / 10) : imageCode.getWidth(null);graphics.drawImage(imageCode, (backGroundImage.getWidth() - width) / 2, backGroundImage.getHeight() / 2 + 100, width, height, null);//设置字体graphics.setFont(font);//设置颜色graphics.setColor(Color.BLACK);//获取字体度量(字体度量是指对于指定字号的某种字体，在度量方面的各种属性)FontMetrics fontMetrics = graphics.getFontMetrics(font);//获取字体度量的宽度int textWidth = fontMetrics.stringWidth(title);//左边距=(模板图宽度-文字宽度)/2int widthX = (backGroundImage.getWidth() - textWidth) / 2-150;//g.drawString(title, 820, 2850);//绘制文字(内容，左边距,上边距)，同一个模板上边距一般也是不变的graphics.drawString(title, widthX, backGroundImage.getHeight() - (size * 2 + 20));graphics.drawString(title, widthX, backGroundImage.getHeight() - (size + 20));//完成模板修改graphics.dispose();//获取新文件的地址//imageName="E://aa.png;//File outPutFile = new File(imageName);ServletOutputStream outPutFile = response.getOutputStream();//生成新的合成过的用户二维码并写入新图片,指定类型为pngImageIO.write(backGroundImage, "png", outPutFile);// 刷新输出流outPutFile.flush();outPutFile.close();} catch (Exception e) {e.printStackTrace();}// 返回给页面的图片地址(因为绝对路径无法访问)//return imageName;}public static InputStream getInputStreamByGet(String url) {try {HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();conn.setReadTimeout(50000);conn.setConnectTimeout(50000);conn.setRequestMethod("GET");if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {return conn.getInputStream();}} catch (IOException e) {e.printStackTrace();}return null;}

	public static void main(String[] args) throws IOException, WriterException {byte[] bytes = generateQRCodeImages("4d5sa4ds4adsad4sd64d6s4a", 350, 350);ImageUtil.merge("http://oss.yunlegeyou.cn/wisdomlife/face/images/1715243426866.jpg",bytes,response);}