图片处理

import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;

public class ImageHandle {
	/**
	 * 等比压缩图片的方法
	 * 
	 * @param srcURL
	 *            原图片路径
	 * @param deskURL
	 *            目标图片路径
	 * @param width
	 *            生成图片的宽度
	 * @throws Exception
	 */
	public void getCompressJPG(String srcURL, String outputPicName, int width,
			int height) {
		double ratio = 1.0;
		double widthRatio = 1;
		double heightRatio = 1;
		File inputFile = new File(srcURL);
		try {
			BufferedImage Bi = ImageIO.read(inputFile);
			int imageWidth = Bi.getWidth();
			int imageHeight = Bi.getHeight();
			widthRatio = imageWidth / (width * 1.0);
			heightRatio = imageHeight / (height * 1.0);
			if (widthRatio < heightRatio) {
				ratio = heightRatio;
			} else {
				ratio = widthRatio;
			}
			int widthdist = (int) Math.floor(Bi.getWidth() / ratio);
			int heightdist = (int) Math.floor(Bi.getHeight() / ratio);
			BufferedImage tag = new BufferedImage(widthdist, heightdist,
					BufferedImage.TYPE_INT_RGB);
			tag.getGraphics().drawImage(
					Bi.getScaledInstance(widthdist, heightdist,
							BufferedImage.SCALE_SMOOTH), 0, 0, null);
			File littleFile = new File(outputPicName);
			ImageIO.write(tag, "JPEG", littleFile);
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

	public static void main(String[] args) {
		ImageHandle imggeHandle = new ImageHandle();
		String srcURL = "D:/aa.jpg";
		String outPutPicName = "D:/cc.jpg";
		int width = 400;
		int height = 500;
		imggeHandle.getCompressJPG(srcURL, outPutPicName, width, height);
	}
}