Determining the Format of an Image in a File : ImageReader « 2D Graphics GUI « Java

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Determining the Format of an Image in a File

  



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;

  }

}

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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