图片缩放

public static void reduceImg(String imgsrc, String imgdist, int widthdist,  
        int heightdist) {  
    try {  
        File srcfile = new File(imgsrc);  
        if (!srcfile.exists()) {  
            return;  
        }  
        Image src = javax.imageio.ImageIO.read(srcfile);  
 
        BufferedImage tag= new BufferedImage((int) widthdist, (int) heightdist,  
                BufferedImage.TYPE_INT_RGB);  
 
        tag.getGraphics().drawImage(src.getScaledInstance(widthdist, heightdist,  Image.SCALE_SMOOTH), 0, 0,  null);  
///         tag.getGraphics().drawImage(src.getScaledInstance(widthdist, heightdist,  Image.SCALE_AREA_AVERAGING), 0, 0,  null);  
          
        FileOutputStream out = new FileOutputStream(imgdist);  
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);  
        encoder.encode(tag);  
        out.close();  
 
    } catch (IOException ex) {  
        ex.printStackTrace();  
    }  
}