com.pentahohub.nexus.util.ImageCropUtils Maven / Gradle / Ivy

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package com.pentahohub.nexus.util;

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.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.imageio.ImageIO;

import org.springframework.util.StreamUtils;

/**
 * 图片剪裁工具类
 * 
 * @author LUOXC
 */
public class ImageCropUtils {

	/**
	 * 图像剪裁(按指定起点坐标和宽高切割)
	 * 
	 * @param in
	 *            源图像
	 * @param out
	 *            剪裁后的图像
	 * @param x
	 *            目标图像起点坐标X
	 * @param y
	 *            目标图像起点坐标Y
	 * @param width
	 *            目标图像宽度
	 * @param height
	 *            目标图像高度
	 * @throws IOException
	 */
	public final static void crop(InputStream in, OutputStream out, int x, int y, int width, int height) throws IOException {
		BufferedImage bi = ImageIO.read(in);
		int srcHeight = bi.getHeight();
		int srcWidth = bi.getWidth();
		if (srcWidth > 0 && srcHeight > 0) {
			Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
			ImageFilter cropFilter = new CropImageFilter(x, y, width, height);
			Image 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);
			g.dispose();
			ImageIO.write(tag, ImageUtils.IMAGE_TYPE_PNG, out);
		}
	}

	public final static void crop(File in, File out, int x, int y, int width, int height) throws IOException {
		crop(new FileInputStream(in), new FileOutputStream(out), x, y, width, height);
	}

	public final static byte[] cropToByteArray(InputStream in, int x, int y, int width, int height) throws IOException {
		ByteArrayOutputStream out = new ByteArrayOutputStream(StreamUtils.BUFFER_SIZE);
		crop(in, out, x, y, width, height);
		return out.toByteArray();
	}

	public final static byte[] cropToByteArray(File in, int x, int y, int width, int height) throws IOException {
		return cropToByteArray(new FileInputStream(in), x, y, width, height);
	}

}