图片-拼接

public class MergePicUtils {
    /**
     * 拼接图片（注：图片需长宽一致）
     *
     * @param files      img1 ，img2
     * @param type       1：横向拼接  2：纵向拼接
     * @param targetFile 合成新的图片地址
     */
    public static void mergeImage(List<String> files, int type, String targetFile) {
        int size = files.size();
        if (size < 1) {
            throw new RuntimeException("图片数量小于1");
        }
        File[] src = new File[size];
        BufferedImage[] images = new BufferedImage[size];
        int[][] ImageArrays = new int[size][];
        for (int i = 0; i < size; i++) {
            try {
                src[i] = new File(files.get(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++) {
            // 横向
            if (type == 1) {
                newHeight = newHeight > images[i].getHeight() ? newHeight : images[i].getHeight();
                newWidth += images[i].getWidth();
            } else if (type == 2) {// 纵向
                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;
        }
        // 生成新图片
        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();
                }
            }
            //输出想要的图片
            ImageIO.write(ImageNew, targetFile.split("\\.")[1], new File(targetFile));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}