package test; import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics2D; import java.awt.Image; import java.awt.RenderingHints; import java.awt.geom.RoundRectangle2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; public class ChangeImage {

    public static BufferedImage makeRoundedCorner(BufferedImage image,             int cornerRadius) {

        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();         return output;     }     public static BufferedImage createResizedCopy(Image originalImage, int scaledWidth,             int scaledHeight, boolean preserveAlpha) {

        int imageType = preserveAlpha ? BufferedImage.TYPE_INT_RGB                 : BufferedImage.TYPE_INT_ARGB;         BufferedImage scaledBI = new BufferedImage(scaledWidth, scaledHeight,                 imageType);         Graphics2D g = scaledBI.createGraphics();         if (preserveAlpha) {

            g.setComposite(AlphaComposite.Src);         }         g.drawImage(originalImage, 0, 0, scaledWidth, scaledHeight, null);         g.dispose();         return scaledBI;     }     public static void main(String[] args) throws IOException {

        BufferedImage icon = ImageIO.read(new File("/home/june/桌面/mm.jpg"));         BufferedImage rounded = makeRoundedCorner(icon, 30);         ImageIO.write(rounded, "png", new File("/home/june/桌面/mm_rounded.png"));                  BufferedImage pic = ImageIO.read(new File("/home/june/桌面/zhang.jpg"));         BufferedImage resized = createResizedCopy(pic, 250, 250*768/1024, true);         ImageIO.write(resized, "jpg", new File("/home/june/桌面/zhang_small.jpg"));     } }