Java瓜分拼接图片

private static void splitImage() throws IOException {
	
	String originalImg = "C:\\img\\split\\a380_1280x1024.jpg";

	// 读入大图
	File file = new File(originalImg);
	FileInputStream fis = new FileInputStream(file);
	BufferedImage image = ImageIO.read(fis);

	// 分割成4*4(16)个小图
	int rows = 4;
	int cols = 4;
	int chunks = rows * cols;

	// 计算每个小图的宽度和高度
	int chunkWidth = image.getWidth() / cols;
	int chunkHeight = image.getHeight() / rows;

	int count = 0;
	BufferedImage imgs[] = new BufferedImage[chunks];
	for (int x = 0; x < rows; x++) {
		for (int y = 0; y < cols; y++) {
			//设置小图的大小和类型
			imgs[count] = new BufferedImage(chunkWidth, chunkHeight, image.getType());

			//写入图像内容
			Graphics2D gr = imgs[count++].createGraphics();
			gr.drawImage(image, 0, 0, 
					chunkWidth, chunkHeight, 
					chunkWidth* y, chunkHeight * x, 
					chunkWidth * y + chunkWidth,
					chunkHeight * x + chunkHeight, null);
			gr.dispose();
		}
	}

	// 输出小图
	for (int i = 0; i < imgs.length; i++) {
		ImageIO.write(imgs[i], "jpg", new File("C:\\img\\split\\img" + i + ".jpg"));
	}
	
	System.out.println("完成分割！");
}

private static void mergeImage() throws IOException {

	int rows = 2;
	int cols = 2;
	int chunks = rows * cols;

	int chunkWidth, chunkHeight;
	int type;

	//读入小图
	File[] imgFiles = new File[chunks];
	for (int i = 0; i < chunks; i++) {
		imgFiles[i] = new File("C:\\img\\merge\\img" + i + ".jpg");
	}

	//创建BufferedImage
	BufferedImage[] buffImages = new BufferedImage[chunks];
	for (int i = 0; i < chunks; i++) {
		buffImages[i] = ImageIO.read(imgFiles[i]);
	}
	type = buffImages[0].getType();
	chunkWidth = buffImages[0].getWidth();
	chunkHeight = buffImages[0].getHeight();

	//设置拼接后图的大小和类型
	BufferedImage finalImg = new BufferedImage(chunkWidth * cols, chunkHeight * rows, type);

	//写入图像内容
	int num = 0;
	for (int i = 0; i < rows; i++) {
		for (int j = 0; j < cols; j++) {
			finalImg.createGraphics().drawImage(buffImages[num], chunkWidth * j, chunkHeight * i, null);
			num++;
		}
	}

	//输出拼接后的图像
	ImageIO.write(finalImg, "jpeg", new File("C:\\img\\merge\\finalImg.jpg"));

	System.out.println("完成拼接！");
}