java 图片裁剪

import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.image.CropImageFilter;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageFilter;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class qqq {
	private String cutImage(File imagePath, int x, int y, int w, int h, int width, int height) throws IOException {
		Image img;
		ImageFilter cropFilter;
		// 读取源图像
		BufferedImage bi = ImageIO.read(imagePath);
		int srcWidth = bi.getWidth(); // 源图宽度
		int srcHeight = bi.getHeight(); // 源图高度
		// 若原图大小大于切片大小，设置目标图片大小
		if (w > srcWidth) {
			w = srcWidth;
		}
		if (h > srcHeight) {
			h = srcHeight;
		}
		// 进行切割
		if (srcWidth >= w && srcHeight >= h) {
			Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
			cropFilter = new CropImageFilter(x, y, w, h);
			img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
			BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
			Graphics g = tag.getGraphics();
			g.drawImage(img, 0, 0, width, height, null); // 绘制缩小后的图
			g.dispose();
			// 获取源文件路径
			String path = imagePath.getPath();
			// 拼接新的输出文件的路径
			String[] split = path.split("\\.");
			String newPath = split[0] + "_cut." + split[1];
			// 创建文件
			File wj = new File(newPath);
			// 输出为文件
			ImageIO.write(tag, "PNG", wj);
			return newPath;
		}
		return null;
	}
}