Java Servlet framework that does things like rencoding images to preferred format etc

Are there any frameworks/libraries that provide servlets/filters etc that handle reencoding on the fly of images.

• interpret the accept headers and output the file, reencoding into the new format if necessary by checking the actual format of the original image file.
• provide a low and high quality version of an image.
• re encode an image into ne开发者_开发问答w dimensions. width and height parameters might query string parameters.

I could create versions of the file in all the formats, at upload time but the seems overkill. I would rather lazily create the rencoded file and stick it in a cache if it gets served again etc.

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You donot need any framework. Do folowing:

1. Upload image. See Apache Commons FileUpload
2. Process the uploaded file using any of
   • Java Advance Imaging
   • Java wrapper for ImageMagick
3. When processed, provide a link to download.

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ImageMagick might be what you're after. http://www.imagemagick.org/script/index.php, there's a java interface for it available here: http://www.jmagick.org/index.html

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As Nishants suggested .. I'd use Apache Commons FileUpload, once you get the image .. just convert it to any format you want

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You need no framework. Java has all you need:

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ImageServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("image/png");
        ServletOutputStream output = response.getOutputStream();
        try {
          BufferedImage image = ImageIO.read( new File( "/path/to/image.jpg" ) );
          ImageIO.write(image, "png", output);
        } finally {
          output.close();
        }
    } 
}