Alexander Lohse schrieb:
As I am coming from PHP I am used to a very quick function-call to find
the size of an image. In Java I have to read the whole image into
memory, which takes very long in terms of request-time.
You don't have to read the entire image. The dimensions are usually
embedded in some meta-data section, so it is not necessary to decode the
entire image just to get the dimensions.
This is how you get the dimensions from image files:
ImageInputStream i = ImageIO.createImageInputStream(new
FileInputStream(file));
try {
Iterator<ImageReader> r = ImageIO.getImageReaders(i);
if (r.hasNext()) {
ImageReader reader = r.next();
reader.setInput(i, true);
width = reader.getWidth(0);
height = reader.getHeight(0);
formatName = reader.getFormatName().toLowerCase();
reader.dispose();
}
} finally {
i.close();
}
HTH,
Timo
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