imageutil.java

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package cn.js.fan.util;

import java.awt.image.*;
import java.io.*;
import javax.imageio.*;


public class ImageUtil {

    
    public static BufferedImage getScaleImage(BufferedImage source,
                                              int width, int height) {
        
        BufferedImage image = new BufferedImage(width, height, source.getType());
        image.createGraphics().drawImage(source, 0, 0, width, height, null);
        return image;
    }

    
    public static BufferedImage getScaleImage(BufferedImage source,
                                              double xscale, double yscale) {
        
        return getScaleImage(source,
                (int)(source.getWidth() * xscale), (int)(source.getHeight() * yscale));
    }

    
    public static boolean scaleImage(File input, File output,
                                     int width, int height) throws IOException {
        BufferedImage image = ImageIO.read(input);
        if (image == null) { return false; }
        image = getScaleImage(image, width, height);
        String name = output.getName();
        String format = name.substring(name.lastIndexOf('.')+1).toLowerCase();
        return ImageIO.write(image, format, output);
    }

    
    public static boolean scaleImage(File input, File output,
                                     double xscale, double yscale) throws IOException {
        BufferedImage image = ImageIO.read(input);
        if (image == null) { return false; }
        image = getScaleImage(image, xscale, yscale);
        String name = output.getName();
        String format = name.substring(name.lastIndexOf('.')+1).toLowerCase();
        return ImageIO.write(image, format, output);
    }

    
    public static boolean Image2Thumb(File input, File output,
                                     int thumbWidth) throws IOException {
       BufferedImage image = ImageIO.read(input);
       if (image == null) {
           return false;
       }
       int w = image.getWidth();
       int h = image.getHeight();

        double dHeight = ((double)thumbWidth)/w * h;
        int height = (int)dHeight;
        if (w>thumbWidth)
            image = getScaleImage(image, thumbWidth, height);
        else
            image = getScaleImage(image, w, h);
        String name = output.getName();
        String format = name.substring(name.lastIndexOf('.')+1).toLowerCase();
        return ImageIO.write(image, format, output);
    }
}