code: public static BufferedImage flipHorizontal(Object srcIm) {
          BufferedImage im1 = read(srcIm);
          int w = im1.getWidth();
          int h = im1.getHeight();
          BufferedImage flipImage = new BufferedImage(w, h, im1.getType());
          Graphics2D gs = flipImage.createGraphics();
          gs.drawImage(im1, 0, 0, w, h, w, 0, 0, h, null);
          gs.dispose();
          return flipImage;
      }
docs: 水平翻转一张图片
  
  @param srcIm
  源图片
  @return 被转换后的图像