【知识积累】BufferedImage类实现图片的切分

package com.leesf.util;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import javax.imageio.ImageIO;
public class ImageUtil {
    // 切图
    public static ArrayList<BufferedImage> cutImage(String fileUrl, int rows,
            int cols, int nums) {
        ArrayList<BufferedImage> list = new ArrayList<BufferedImage>();
        try {
            BufferedImage img = ImageIO.read(new File(fileUrl));
            int lw = img.getWidth() / cols;
            int lh = img.getHeight() / rows;
            for (int i = 0; i < nums; i++) {
                BufferedImage buffImg = img.getSubimage(i % cols * lw, i / cols
                        * lh, lw, lh);
                list.add(buffImg);
            }
            return list;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return list;
    }
    public static void main(String[] args) throws IOException {
        ArrayList<BufferedImage> biLists = ImageUtil.cutImage("img/image2.jpg",
                2, 2, 4);
        String fileNameString = "E:";
        int number = 0;
        String format = "jpg";
        for (BufferedImage bi : biLists) {
            File file1 = new File(fileNameString + File.separator + number
                    + "." + format);
            ImageIO.write(bi, format, file1);
            number++;
        }
    }
}