Re: getting img dimensions..

From:
"Remi Arntzen" <Remi.Arntzen@gmail.com>
Newsgroups:
comp.lang.java.help
Date:
7 Aug 2006 23:52:28 -0700
Message-ID:
<1155019948.113319.290700@p79g2000cwp.googlegroups.com>
dsjoblom@abo.fi wrote:

Remi Arntzen wrote:

maya wrote:

can you do with java what you can do with PHP as described here?
http://us2.php.net/manual/en/function.getimagesize.php

 > >

namely, get image-dimensions.. is there a way to do this w/Java ON T=

HE

SERVER, not in an applet or swing app..

thank you..


java.awt.image.BufferedImage image =
javax.imageio.ImageIO.read(java.io.File);
int imageWidth = image.getWidth();
int imageHeight = image.getHeight();


Although this works, it is a bit heavy handed. There's no reason to
read the whole image into memory. Try something like this instead:

        /**
     * Attempts to read image width and height from file.
     *
     * @param file File that contains image
     * @return image dimensions or null if file does not contain
     * an image or an error occurs while reading file.
     */
    public static Dimension readDimensions(File file)
    {
        ImageInputStream iis = null;
        ImageReader reader = null;
        try
        {
            iis = new FileImageInputStream(file);
            Iterator it = ImageIO.getImageReaders(iis);
            if (!it.hasNext())
                return null;

            reader = (ImageReader) it.next();
            reader.setInput(iis, true, true);

            return new Dimension(reader.getWidth(0), reader.getHeight(0));
        }
        catch (IOException e)
        {
            e.printStackTrace();
            return null;
        }
        finally
        {
            try
            {
                if (reader != null)
                    reader.dispose();
                if (iis != null)
                    iis.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
    }

Regards,
Daniel Sj=F6blom


Thanks, it definitely is faster. Does this method internally access
the image's meta-data?

maya wrote:

thank you.. can you use java.awt on the server???
(this is for server-processing, for a CMS, so can't use any client-side
stuff..)


All J2EE servers require all the api classes of the J2SE to function,
i.e. J2EE can't do much without java.lang.String. The only difference
is that certain J2EE servers may impose security restrictions on direct
file access and other things through policy files.

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