/**
 * 拼接圖片（注：圖片需長寬一致）
 * @param files  img1 ，img2
 * @param type  1：橫向拼接 2：縱向拼接
 * @param targetFile 合成新的圖片地址
 */
public static void mergeImage(String[] files, int type, String targetFile) {
 int len = files.length;
 if (len < 1) {
  throw new RuntimeException("圖片數(shù)量小于1");
 }
 File[] src = new File[len];
 BufferedImage[] images = new BufferedImage[len];
 int[][] ImageArrays = new int[len][];
 for (int i = 0; i < len; i++) {
  try {
   src[i] = new File(files[i]);
   images[i] = ImageIO.read(src[i]);
  } catch (Exception e) {
   throw new RuntimeException(e);
  }
  int width = images[i].getWidth();
  int height = images[i].getHeight();
  ImageArrays[i] = new int[width * height];
  ImageArrays[i] = images[i].getRGB(0, 0, width, height, ImageArrays[i], 0, width);
 }
 int newHeight = 0;
 int newWidth = 0;
 for (int i = 0; i < images.length; i++) {
  // 橫向
  if (type == 1) {
   newHeight = newHeight > images[i].getHeight() ? newHeight : images[i].getHeight();
   newWidth += images[i].getWidth();
  } else if (type == 2) {// 縱向
   newWidth = newWidth > images[i].getWidth() ? newWidth : images[i].getWidth();
   newHeight += images[i].getHeight();
  }
 }
 if (type == 1 && newWidth < 1) {
  return;
 }
 if (type == 2 && newHeight < 1) {
  return;
 }
 // 生成新圖片
 try {
  BufferedImage ImageNew = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);
  int height_i = 0;
  int width_i = 0;
  for (int i = 0; i < images.length; i++) {
   if (type == 1) {
    ImageNew.setRGB(width_i, 0, images[i].getWidth(), newHeight, ImageArrays[i], 0,
      images[i].getWidth());
    width_i += images[i].getWidth();
   } else if (type == 2) {
    ImageNew.setRGB(0, height_i, newWidth, images[i].getHeight(), ImageArrays[i], 0, newWidth);
    height_i += images[i].getHeight();
   }
  }
  //輸出想要的圖片
  ImageIO.write(ImageNew, targetFile.split("\\.")[1], new File(targetFile));
 } catch (Exception e) {
  throw new RuntimeException(e);
 }
}