java图片缩放剪切处理

package action;         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.FileOutputStream;     import java.io.IOException;         import javax.imageio.ImageIO;         import com.sun.image.codec.jpeg.JPEGCodec;     import com.sun.image.codec.jpeg.JPEGImageEncoder;         public class ImageProcess {             /**         * 对图片进行缩放         *          * @param srcImgFileName         * @throws IOException         */        public void zoomImage(String srcImgFileName) throws IOException {             // 读入文件             File _file = new File(srcImgFileName);             // 构造Image对象             BufferedImage src = javax.imageio.ImageIO.read(_file);             int width = src.getWidth();             int height = src.getHeight();                 // 边长缩小为二分之一             BufferedImage tag = new BufferedImage(width / 2, height / 2, BufferedImage.TYPE_INT_RGB);             // 绘制缩小后的图             tag.getGraphics().drawImage(src, 0, 0, width / 2, height / 2, null);             FileOutputStream out = new FileOutputStream("D:\\test1\\targetIMG1-4.jpg");             JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);             encoder.encode(tag);             out.close();                 // 边长扩大为2倍             tag = new BufferedImage(width * 2, height * 2, BufferedImage.TYPE_INT_RGB);             tag.getGraphics().drawImage(src, 0, 0, width * 2, height * 2, null);             out = new FileOutputStream("D:\\test1\\targetIMGx2.jpg");             encoder = JPEGCodec.createJPEGEncoder(out);             encoder.encode(tag);             out.close();             }             /**         * 将图片分成九块         *          * @param srcImageFile         * @throws IOException         */        public void cut(String srcImageFile) throws IOException {             Image img;             ImageFilter cropFilter;             String dir = null;             // 读取源图像             BufferedImage src = ImageIO.read(new File(srcImageFile));             int destWidth = src.getWidth() / 3;             int destHeight = src.getHeight() / 3;             // 循环             for (int i = 0; i < 3; i++) {                 for (int j = 0; j < 3; j++) {                     // 四个参数分别为图像起点坐标和宽高                     cropFilter = new CropImageFilter(j * destWidth, i * destHeight, destWidth, destHeight);                     img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(src.getSource(), cropFilter));                     BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);                     Graphics g = tag.getGraphics();                     g.drawImage(img, 0, 0, null); // 绘制小图                     g.dispose();                     // 输出为文件                     dir = "D:\\test1\\cut_image_" + i + "_" + j + ".jpg";                     File f = new File(dir);                     ImageIO.write(tag, "JPEG", f);                 }             }         }             public static void main(String[] args) throws IOException {             String imgFileName = "D:\\test\\test.png";             ImageProcess iZoom = new ImageProcess();                 iZoom.zoomImage(imgFileName);             iZoom.cut(imgFileName);         }     }