Java 图片切割

将图片横切或者竖切为两张

	public void carveImage(String dir, File file, String orient, int width, int height) {
		ImageFilter cropFilter;
		Image img;
		try {
			// 读取源图像
			BufferedImage bi = ImageIO.read(file);
			int srcWidth = bi.getWidth(); // 源图宽度
			int srcHeight = bi.getHeight(); // 源图高度

			int destWidth, destHeight;
			int j = 1, k = 1;
			// 判断
			if ("2".equals(orient)) {// 竖切
				destWidth = srcWidth / 2;
				destHeight = srcHeight;
				k = 0;
			} else if ("1".equals(orient)) {// 横切
				destWidth = srcWidth;
				destHeight = srcHeight / 2;
				j = 0;
			} else {
				return;
			}
			String fileName;
			String filePath;
			if (srcWidth >= destWidth && srcHeight >= destHeight) {
				Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
				for (int i = 0; i < 2; i++) {
					fileName = System.currentTimeMillis() + ".jpg";
					filePath = dir + "/" + fileName;
					cropFilter = new CropImageFilter(i * destWidth * j, i * destHeight * k, destWidth, destHeight);
					img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
					BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);
					Graphics g = tag.getGraphics();
					new CropThread(g, img).start();
					ImageIO.write(tag, "JPEG", new File(filePath));
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
			throw new RuntimeException(e);
		}
	}
class CropThread extends Thread {
	Graphics g = null;
	Image img = null;

	public CropThread(Graphics g, Image img) {
		this.g = g;
		this.img = img;
	}

	public void run() {
		g.drawImage(img, 0, 0, null); // 绘制缩小后的图
		g.dispose();
	}
}