Java实现的不同图片居中剪裁生成同一尺寸缩略图功能示例

package platform.edu.resource.utils;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import javax.imageio.ImageIO;/** * 图片工具类 * @author hjn * @version 1.0 2013-11-26 * */public class ImageUtil {/** * 图片等比缩放居中剪裁 * 不管尺寸不等的图片生成的缩略图都是同一尺寸，方便用于页面展示 * @param imageSrc图片所在路径 * @param thumbWidth缩略图宽度 * @param thumbHeight缩略图长度 * @param outFilePath缩略图存放路径 * @throws InterruptedException * @throws IOException */public static void createImgThumbnail(String imgSrc, int thumbWidth, int thumbHeight, String outFilePath) throws InterruptedException, IOException {File imageFile=new File(imgSrc);BufferedImage image = ImageIO.read(imageFile);Integer width = image.getWidth();Integer height = image.getHeight();double i = (double) width / (double) height;double j = (double) thumbWidth / (double) thumbHeight;int[] d = new int[2];int x = 0;int y = 0;if (i > j) {d[1] = thumbHeight;d[0] = (int) (thumbHeight * i);y = 0;x = (d[0] - thumbWidth) / 2;} else {d[0] = thumbWidth;d[1] = (int) (thumbWidth / i);x = 0;y = (d[1] - thumbHeight) / 2;}File outFile = new File(outFilePath);if (!outFile.getParentFile().exists()) {outFile.getParentFile().mkdirs();}/*等比例缩放*/BufferedImage newImage = new BufferedImage(d[0],d[1],image.getType());    Graphics g = newImage.getGraphics();    g.drawImage(image, 0,0,d[0],d[1],null);    g.dispose();    /*居中剪裁*/newImage = newImage.getSubimage(x, y, thumbWidth, thumbHeight);ImageIO.write(newImage, imageFile.getName().substring(imageFile.getName().lastIndexOf(".") + 1), outFile);}}