Graphics2D 图片上添加图片或绘制二维码 代码实例 // 读取原图片信息 //得到文件 File file = new File("d:\\1.png"); //文件转化为图片 Image srcImg = ImageIO.read(file); //获取图片的宽 int srcImgWidth = srcImg.getWidth(null); //获取图片的高 int srcImgHeight = srcImg.getHeight(null); // 加水印 BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB); Graphics2D g = bufImg.createGraphics(); g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null); //使用工具类生成二维码 Image image = createQrCode("二维码内容", 226, 226, "二维码中间logo图片地址"); //将小图片绘到大图片上,表示你的小图片在大图片上的位置。 g.drawImage(image, 263, 700, null); //或者将图片绘制上去 File file = new File("d:\\2.png"); BufferedImage read = ImageIO.read(file); Graphics2D k = bufImg.createGraphics(); //将小图片绘到大图片上,表示你的小图片在大图片上的位置。 k.drawImage(read, 650, 188, 150,150,null); k.setColor(Color.WHITE); k.dispose(); //设置颜色。 g.setColor(Color.WHITE); g.dispose(); ByteArrayOutputStream bs = new ByteArrayOutputStream(); ImageOutputStream imOut = ImageIO.createImageOutputStream(bs); ImageIO.write(bufImg, "png", imOut); InputStream inputStream = new ByteArrayInputStream(bs.toByteArray()); OutputStream outStream = new FileOutputStream("d:\\3.png"); IOUtils.copy(inputStream, outStream); inputStream.close(); outStream.close(); private static BufferedImage createQrCode(String content, int width, int height, String logoPath) throws IOException { QrConfig config = new QrConfig(width, height); if (logoPath != null) { Image image = ImageIO.read(new FileInputStream(new File(logoPath))); config.setImg(image); } config.setErrorCorrection(ErrorCorrectionLevel.H); return QrCodeUtil.generate( content, config); }二维码生成工具引用 <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.2.4</version> </dependency>