Java上传图片后的缩放，Java上传图片缩放,import java.

Java上传图片后的缩放，Java上传图片缩放,import java.

import java.awt.Color;import java.awt.Graphics2D;import java.awt.Image;import java.awt.image.BufferedImage;import java.awt.image.ConvolveOp;import java.awt.image.Kernel;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import org.apache.commons.fileupload.FileItem;import org.apache.log4j.Logger;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;public class ImageUtil {    /**     * Logger for this class     */    private static final Logger logger = Logger.getLogger(ImageUtil.class);    public void imageScale(String srcFilePath, String targetFilePath,            int width, int height) {        this.imageScale(new File(srcFilePath), new File(targetFilePath), width,                height);    }    public void imageScale(File srcFile, File targetFile, int width, int height) {        try {            Image image = javax.imageio.ImageIO.read(srcFile);            image = image.getScaledInstance(width, height,                    Image.SCALE_AREA_AVERAGING);            // Make a BufferedImage from the Image.            BufferedImage mBufferedImage = new BufferedImage(width, height,                    BufferedImage.TYPE_INT_RGB);            Graphics2D g2 = mBufferedImage.createGraphics();                        g2.drawImage(image, 0, 0, width, height, Color.white, null);            g2.dispose();            float[] kernelData2 = { -0.125f, -0.125f, -0.125f, -0.125f, 2,                    -0.125f, -0.125f, -0.125f, -0.125f };            Kernel kernel = new Kernel(3, 3, kernelData2);            ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);            mBufferedImage = cOp.filter(mBufferedImage, null);            File targetDir = targetFile.getParentFile();            if (!targetDir.exists())                targetDir.mkdirs();            FileOutputStream out = new FileOutputStream(targetFile);            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);            encoder.encode(mBufferedImage);            out.close();        } catch (Exception e) {            logger.error(                    "imageScale(String, String, int, int) - 图片压缩出错 - srcFilePath="                            + srcFile.getPath() + ", targeFilePath="                            + targetFile.getPath() + ", width=" + width                            + ", height=" + height, e);        }    }    public void imageScale(FileItem fileItem, String targetFilePath, int width,            int height) {        try {            InputStream input = fileItem.getInputStream();            Image image = javax.imageio.ImageIO.read(input);            image = image.getScaledInstance(width, height,                    Image.SCALE_AREA_AVERAGING);            BufferedImage mBufferedImage = new BufferedImage(width, height,                    BufferedImage.TYPE_INT_RGB);            Graphics2D g2 = mBufferedImage.createGraphics();            g2.drawImage(image, 0, 0, width, height, Color.white, null);            g2.dispose();            float[] kernelData2 = { -0.125f, -0.125f, -0.125f, -0.125f, 2,                    -0.125f, -0.125f, -0.125f, -0.125f };            Kernel kernel = new Kernel(3, 3, kernelData2);            ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);            mBufferedImage = cOp.filter(mBufferedImage, null);            File target = new File(targetFilePath);            File targetDir = target.getParentFile();            if (!targetDir.exists())                targetDir.mkdirs();            FileOutputStream out = new FileOutputStream(targetFilePath);            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);            encoder.encode(mBufferedImage);            out.close();            input.close();        } catch (Exception e) {            logger.error(                    "imageScale(String, String, int, int) - 图片压缩出错 - fileItem="                            + fileItem.getName() + ", targetFilePath="                            + targetFilePath + ", width=" + width + ", height="                            + height, e);        }    }    public static void main(String[] args) {        ImageUtil iu=new ImageUtil();        iu.imageScale("c:/uploadFiles/191540095661.jpg", "c:/uploadFiles/t.jpg", 270, 220);    }}