- import java.io.File;
- import java.io.IOException;
- import java.util.Iterator;
- import javax.imageio.ImageIO;
- import javax.imageio.ImageReader;
- import javax.imageio.stream.ImageInputStream;
- public class DetermineFormatOfAnImage {
- public static void main(String[] args) throws IOException {
- // get image format in a file
- File file = new File("newimage.jpg");
- // create an image input stream from the specified file
- ImageInputStream iis = ImageIO.createImageInputStream(file);
- // get all currently registered readers that recognize the image format
- Iterator<ImageReader> iter = ImageIO.getImageReaders(iis);
- if (!iter.hasNext()) {
- throw new RuntimeException("No readers found!");
- }
- // get the first reader
- ImageReader reader = iter.next();
- System.out.println("Format: " + reader.getFormatName());
- // close stream
- iis.close();
- }
- }
来源: http://www.phpxs.com/code/1002691/