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| Determining the Format of an Image in a File |
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import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
public class Main {
public static void main(String[] argv) throws Exception {
File file = new File("image.gif");
System.out.println(getFormatName(file));
InputStream is = new FileInputStream(file);
is.close();
System.out.println(getFormatName(is));
}
private static String getFormatName(Object o) {
try {
ImageInputStream iis = ImageIO.createImageInputStream(o);
Iterator iter = ImageIO.getImageReaders(iis);
if (!iter.hasNext()) {
return null;
}
ImageReader reader = (ImageReader) iter.next();
iis.close();
return reader.getFormatName();
} catch (IOException e) {
}
return null;
}
}
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| Related examples in the same category |
| 1. | Show Image with ImageReader | | | | 2. | Add Image IO Read Progress Listener to ImageReader | | | | 3. | Read an Image from a file | | | | 4. | Read an Image from inputStream | | | | 5. | Read an Image from URL | | | | 6. | Detect the file type of the input stream prior to reading the image | | | | 7. | List the image formats that can be read and written | | | | 8. | Get file format, image resolution, number of bits per pixel (JPEG, GIF, BMP, PCX, PNG, IFF, RAS, PBM, PGM, PPM, PSD and SWF files) | | | | 9. | Image format info | | | | 10. | Image observer blocks until the image is completely loaded. AWT defers the loading of images until they are painted on a graphic. | | |
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