//拿到二维码
BufferedImage twodimensioncode = ImageIO.read(new File("C:/Users/HY/Desktop/newPic12312312.jpg"));
//绘制
Graphics2D g = twodimensioncode.createGraphics();
//读取logo
BufferedImage logo = ImageIO.read(new File("C:/Users/HY/Desktop/a1231.png"));
//设置二维码大小,太大,会覆盖二维码,此处20%
int logoWidth = logo.getWidth(null) > twodimensioncode.getWidth()*3 /10 ? (twodimensioncode.getWidth()*3 /10) : logo.getWidth(null);
int logoHeight = logo.getHeight(null) > twodimensioncode.getHeight()*3 /10 ? (twodimensioncode.getHeight()*3 /10) : logo.getHeight(null);
// 确定二维码的中心位置坐标,设置logo图片放置的位置
int x = (twodimensioncode.getWidth() - logoWidth) / 2;
int y = (twodimensioncode.getHeight() - logoHeight) / 2;
g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
//开始合并绘制图片
g.drawImage(logo, x, y, logoWidth, logoHeight, null);
g.drawRoundRect(x, y, logoWidth, logoHeight, 15 ,15);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
g.dispose();
logo.flush();
twodimensioncode.flush();
ImageIO.write(twodimensioncode, "jpeg", new File("C:/Users/HY/Desktop/newPic12312312.jpg"));
System.out.println("创建成功");