Java实现图片拼接（注：图片需长宽一致）

/**
 *  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(String[] files, int type, String targetFile) {
    int len = files.length;
    if (len < 1) {
        throw new RuntimeException("图片数量小于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++) {
        // 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);
    }
}