apache图片裁剪

Apache Commons Imaging是一个流行的开源库，用于处理各种图像文件格式，并提供了一些方便的功能，包括图片的裁剪。在Java中，你可以使用它来裁剪图片。这里是一个简单的示例：

import org.apache.commons.imaging.ImageIO;
import org.apache.commons.imaging.util.IoUtils;

import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class ImageCropExample {
    public static BufferedImage cropImage(File source, Point2D destPoint, int width, int height) throws IOException {
        File croppedFile = new File(source.getName() + "_cropped.jpg");
        BufferedImage originalImage = ImageIO.read(source);
        int x = (int) destPoint.getX();
        int y = (int) destPoint.getY();
        int srcWidth = originalImage.getWidth();
        int srcHeight = originalImage.getHeight();

        // 裁剪边界校验
        if (x < 0 || y < 0 || x > srcWidth - width || y > srcHeight - height) {
            throw new IllegalArgumentException("Invalid cropping coordinates");
        }

        BufferedImage croppedBufferedImage = originalImage.getSubimage(x, y, width, height);
        try (ImageOutputStream outputStream = ImageIO.createImageOutputStream(croppedFile)) {
            ImageIO.write(croppedBufferedImage, "jpg", outputStream);
        }
        return croppedBufferedImage;
    }

    public static void main(String[] args) {
        try {
            BufferedImage croppedImage = cropImage(new File("source.jpg"), new Point2D.Float(50f, 75f), 200, 150);
            // 对裁剪后的图片做进一步操作...
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

这个例子中，我们首先读取源图片，然后指定裁剪点和尺寸来创建一个新的`BufferedImage`对象，最后将裁剪后的图像保存到新的文件中。