Melih Sakarya

	<servlet>
		<description></description>
		<display-name>ImageResizer</display-name>
		<servlet-name>ImageResizer</servlet-name>
		<servlet-class>
			com.vardar.util.image.ImageResizer
		</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>ImageResizer</servlet-name>
		<url-pattern>/ImageResizer</url-pattern>
	</servlet-mapping>

package com.vardar.utils.image;
 
import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
 
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * Servlet implementation class for Servlet: ImageResizer
 *
 */
public class ImageResizer extends HttpServlet {
    private static final long serialVersionUID = -8285774993751841288L;
    public void doGet(HttpServletRequest request, HttpServletResponse response) {
        String imageOutput = getParam(request, "output", "jpg");
        String imageRoot = getParam(request, "root", "c:/upl/");
        String imageFile = getParam(request, "file", "vardar.gif");
        int width = Integer.parseInt(getParam(request, "width", "250"));
        int height = Integer.parseInt(getParam(request, "height", "0"));
        if ("png".equals(imageOutput)) {
            response.setContentType("image/png");
        } else {
            response.setContentType("image/jpeg");
        }
        //String imageLoc = request.getSession().getServletContext().getRealPath(imageRoot) +"\\"+ imageFile;
        String imageLoc = imageRoot+imageFile;
        System.out.println("imageLoc = " + imageLoc);
        if((new File(imageRoot+width+"x"+imageFile)).exists()){
        	System.out.println("Dosya var = " + imageRoot+width+"x"+imageFile);
        	try {
        		BufferedImage bufferedImage = ImageIO.read(new File(imageRoot+width+"x"+imageFile));
        		ImageIO.write(bufferedImage, imageOutput, response.getOutputStream());
 
        	} catch (Exception e) {
	            System.out.println("Problem with image: " + imageLoc + e);
	        } 
    	}
        else{
        	System.out.println("Dosya yok ve yaratiliyor = " + imageRoot+width+"x"+imageFile);
	        try {
	            BufferedImage bufferedImage = ImageIO.read(new File(imageLoc));
	            int calcHeight = height > 0 ? height : (width * bufferedImage.getHeight() / bufferedImage.getWidth());
	            ImageIO.write(createResizedCopy(bufferedImage, width, calcHeight), imageOutput
, response.getOutputStream());
 
	            BufferedOutputStream buf = new BufferedOutputStream(new FileOutputStream(imageRoot+width+"x"+imageFile));
	            ImageIO.write(createResizedCopy(bufferedImage, width, calcHeight), imageOutput, buf);
	            buf.flush();
	            buf.close();
 
	        } catch (Exception e) {
	            System.out.println("Problem with image: " + imageLoc + e);
	        }
        }
    }
    BufferedImage createResizedCopy(Image originalImage, int scaledWidth, int scaledHeight) {
        BufferedImage scaledBI = new BufferedImage(scaledWidth, scaledHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = scaledBI.createGraphics();
        g.setComposite(AlphaComposite.Src);
        g.drawImage(originalImage, 0, 0, scaledWidth, scaledHeight, null);
        g.drawString("www.melihsakarya.com", 20, 20);
        g.dispose();
        return scaledBI;
    }
 
    private String getParam(HttpServletRequest request, String param, String def) {
        String parameter = request.getParameter(param);
        if (parameter == null || "".equals(parameter)) {
            return def;
        } else {
            return parameter;
        }
    }
}