Java缩放图片及剪裁圆形图标代码

剪裁圆形图标对生成png格式有效，对jpg无效，代码如下：

import java.awt.AlphaComposite;import java.awt.Color;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.RenderingHints;import java.awt.geom.RoundRectangle2D;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.IOException;import javax.imageio.ImageIO;import javax.swing.ImageIcon;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGEncodeParam;import com.sun.image.codec.jpeg.JPEGImageEncoder;/** * <b> </b> * <p> * 功能: * </p> *  * @作者 stone * @创建时间 2016年7月19日 下午2:40:59 * @修改内容 * @修改时间 */public class ImageUtil {    /**     * 重新设置图像大小     * @param sfile 图片源文件     * @param tfile 目标文件     * @param newWidth 新宽度     * @param newHeight 新高度     * @param quality 质量系数     * @throws IOException     */    public static void resizeImg(String sfile, String tfile, int newWidth,            int newHeight, float quality) throws IOException {        if(quality > 1) {              throw new IllegalArgumentException(                      "Quality has to be between 0 and 1");          }        if(newWidth <=0 || newHeight<=0) {            throw new IllegalArgumentException(                      "Width or Height must greater than zero");        }        //This code ensures that all the pixels in the image are loaded.        Image srcImg = new ImageIcon(sfile).getImage();        Image resizedImage = srcImg.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH);        // This code ensures that all the pixels in the image are loaded.          Image temp = new ImageIcon(resizedImage).getImage();          // Create the buffered image.          BufferedImage bufferedImage = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);        // Copy image to buffered image.          Graphics g = bufferedImage.createGraphics();          // Clear background and paint the image.          g.setColor(Color.white);          g.fillRect(0, 0, newWidth, newHeight);          g.drawImage(temp, 0, 0, null);          g.dispose();          // Soften.          float softenFactor = 0.05f;          float[] softenArray = { 0, softenFactor, 0, softenFactor,                  1 - (softenFactor * 4), softenFactor, 0, softenFactor, 0 };          Kernel kernel = new Kernel(3, 3, softenArray);          ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);          bufferedImage = cOp.filter(bufferedImage, null);        // Write the jpeg to a file.          FileOutputStream out = null;        try {            out = new FileOutputStream(new File(tfile));              // Encodes image as a JPEG data stream              JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);              JPEGEncodeParam param = encoder                      .getDefaultJPEGEncodeParam(bufferedImage);              param.setQuality(quality, true);              encoder.setJPEGEncodeParam(param);              encoder.encode(bufferedImage);         } catch (IOException e) {            e.printStackTrace();            throw e;        } finally {            if (out != null) {                out.close();            }        }    }    public static void makeRoundedCornerImg(String sfile, String tfile,            int cornerRadius) throws IOException {        BufferedImage image = ImageIO.read(new File(sfile));        int w = image.getWidth();        int h = image.getHeight();        BufferedImage output = new BufferedImage(w, h,                BufferedImage.TYPE_INT_ARGB);        Graphics2D g2 = output.createGraphics();        // This is what we want, but it only does hard-clipping, i.e. aliasing        // g2.setClip(new RoundRectangle2D ...)        // so instead fake soft-clipping by first drawing the desired clip shape        // in fully opaque white with antialiasing enabled...        g2.setComposite(AlphaComposite.Src);        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,                RenderingHints.VALUE_ANTIALIAS_ON);        g2.setColor(Color.WHITE);        g2.fill(new RoundRectangle2D.Float(0, 0, w, h, cornerRadius,                cornerRadius));        // ... then compositing the image on top,        // using the white shape from above as alpha source        g2.setComposite(AlphaComposite.SrcAtop);        g2.drawImage(image, 0, 0, null);        g2.dispose();        String filetype = tfile.substring(tfile.lastIndexOf(".")+1);        try {            ImageIO.write(output, filetype, new File(tfile));        } catch (IOException e) {            e.printStackTrace();        }    }    public static void main(String[] args) throws IOException {          String filepath = "D:/img/";        ImageUtil.resizeImg(filepath+"1.png", filepath+"1-256-256-1.png", 256, 256, 1.0f);        ImageUtil.resizeImg(filepath+"1.png", filepath+"1-256-256-2.png", 256, 256, 0.7f);        ImageUtil.resizeImg(filepath+"2.png", filepath+"2-256-256.png", 256, 256, 1.0f);        ImageUtil.resizeImg(filepath+"3.jpg", filepath+"3-256-256.jpg", 256, 256, 1.0f);        ImageUtil.makeRoundedCornerImg(filepath+"2-256-256.png", filepath+"2-256-256-90.png", 90);        ImageUtil.makeRoundedCornerImg(filepath+"2-256-256.png", filepath+"2-256-256-180.png", 180);        ImageUtil.makeRoundedCornerImg(filepath+"2-256-256.png", filepath+"2-256-256-360.png", 360);        ImageUtil.makeRoundedCornerImg(filepath+"3-256-256.jpg", filepath+"3-256-256-360.png", 360);    }  }