Example usage for javax.imageio ImageIO getImageReaders

Introduction

In this page you can find the example usage for javax.imageio ImageIO getImageReaders.

Prototype

public static Iterator<ImageReader> getImageReaders(Object input) 

Source Link

Document

Returns an Iterator containing all currently registered ImageReader s that claim to be able to decode the supplied Object , typically an ImageInputStream .

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ImageInputStream imageStream = ImageIO.createImageInputStream(new URL("").openStream());
    Iterator<ImageReader> readers = ImageIO.getImageReaders(imageStream);
    ImageReader reader = null;// w  w  w.  jav a 2  s  .  co  m
    if (!readers.hasNext()) {
        imageStream.close();
        return;
    } else {
        reader = readers.next();
    }
    String formatName = reader.getFormatName();
    if (!formatName.equalsIgnoreCase("jpeg") && !formatName.equalsIgnoreCase("png")
            && !formatName.equalsIgnoreCase("gif")) {
        imageStream.close();
        return;
    }
    reader.setInput(imageStream, true, true);
    BufferedImage theImage = reader.read(0);
    reader.dispose();
    imageStream.close();
}

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From source file:Main.java

public static void main(String[] args) throws IOException {
    URL[] urls = { new URL("http://yourserver/small.png") };
    for (URL url : urls) {
        ImageInputStream iis = ImageIO.createImageInputStream(url.openStream());
        Iterator<ImageReader> readers = ImageIO.getImageReaders(iis);

        System.out.println("url= " + url.getPath());
        while (readers.hasNext()) {
            ImageReader read = readers.next();
            System.out.println("format name = " + read.getFormatName());
        }/*from w  w  w . j a va 2s. c o  m*/
        System.out.println();
    }
}

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From source file:it.tidalwave.imageio.example.stats.FocalLengthStats.java

public static void main(final String[] args) {
    try {/* w  w w.  j  a va  2  s  .com*/
        final PrintWriter out = new PrintWriter(new File(args[1]));
        new DirectoryWalker() {
            @Override
            protected void handleFile(final File file, final int depth, final Collection results)
                    throws IOException {
                if (file.getName().toUpperCase().endsWith(".NEF")) {
                    System.out.printf("Processing %s...\n", file.getCanonicalPath());
                    final ImageReader reader = (ImageReader) ImageIO.getImageReaders(file).next();
                    reader.setInput(ImageIO.createImageInputStream(file));
                    final IIOMetadata metadata = reader.getImageMetadata(0);
                    final NEFMetadata nefMetadata = (NEFMetadata) metadata;
                    final IFD exifIFD = nefMetadata.getExifIFD();
                    final TagRational focalLength = exifIFD.getFocalLength();
                    out.println(focalLength.doubleValue());
                }
            }

            public void start() throws IOException {
                super.walk(new File(args[0]), new ArrayList<Object>());
            }
        }.start();

        out.flush();
        out.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:Main.java

private static String getFormatName(Object o) {
    try {/*ww w .j  ava  2 s . c om*/
        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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From source file:Main.java

public static BufferedImage readFragment(InputStream stream, Rectangle rect) throws IOException {
    ImageInputStream imageStream = ImageIO.createImageInputStream(stream);
    ImageReader reader = ImageIO.getImageReaders(imageStream).next();
    ImageReadParam param = reader.getDefaultReadParam();

    param.setSourceRegion(rect);/*from   w  w w  .ja  v  a 2  s. c  o  m*/
    reader.setInput(imageStream, true, true);
    BufferedImage image = reader.read(0, param);

    reader.dispose();
    imageStream.close();

    return image;
}

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From source file:de.mpg.imeji.presentation.metadata.extractors.BasicExtractor.java

public static List<String> extractTechMd(Item item) throws Exception {
    List<String> techMd = new ArrayList<String>();
    URI uri = item.getFullImageUrl();
    String imageUrl = uri.toURL().toString();
    GetMethod method = new GetMethod(imageUrl);
    method.setFollowRedirects(false);/* ww w  .  j a  v a2 s  .c  o m*/
    String userHandle = null;
    userHandle = LoginHelper.login(PropertyReader.getProperty("imeji.escidoc.user"),
            PropertyReader.getProperty("imeji.escidoc.password"));
    method.addRequestHeader("Cookie", "escidocCookie=" + userHandle);
    HttpClient client = new HttpClient();
    client.executeMethod(method);
    InputStream input = method.getResponseBodyAsStream();
    ImageInputStream iis = ImageIO.createImageInputStream(input);
    Iterator<ImageReader> readers = ImageIO.getImageReaders(iis);
    if (readers.hasNext()) {
        // pick the first available ImageReader
        ImageReader reader = readers.next();
        // attach source to the reader
        reader.setInput(iis, true);
        // read metadata of first image
        IIOMetadata metadata = reader.getImageMetadata(0);
        String[] names = metadata.getMetadataFormatNames();
        int length = names.length;
        for (int i = 0; i < length; i++) {
            displayMetadata(techMd, metadata.getAsTree(names[i]));
        }
    }
    return techMd;
}

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From source file:ImageUtilities.java

/**
 * Returns the format of an image (as string).
 * /*  w ww  .  j a  v a  2s. c o  m*/
 * @param stream
 *            image source stream
 * 
 * @return format stream (e.g. "JPEG")
 * 
 * @throws IOException
 *             if an I/O error occured
 */
public static String getFormat(InputStream stream) throws IOException {
    ImageInputStream iis = ImageIO.createImageInputStream(stream);
    Iterator iter = ImageIO.getImageReaders(iis);
    if (!iter.hasNext()) {
        throw new IOException("Unsupported image format!");
    }
    ImageReader reader = (ImageReader) iter.next();
    iis.close();
    return reader.getFormatName();
}

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From source file:ar.com.zauber.common.image.impl.AbstractImage.java

/**
 * Validate if is holds an image. This method closes is.
 * //ww w .j  a va 2 s .  co m
 * @param is image to validate
 * @throws IOException on i/o error.
 * @throws IllegalArgumentException if is doesn't represent an image
 */
public static void validateImage(final InputStream is) throws IOException, IllegalArgumentException {
    try {
        final ImageInputStream iis = ImageIO.createImageInputStream(is);
        final Iterator<ImageReader> i = ImageIO.getImageReaders(iis);
        iis.close();
        if (!i.hasNext()) {
            throw new IllegalArgumentException("don't know how to read " + "that type of images");
        }
    } finally {
        is.close();
    }
}

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From source file:nova.core.wrapper.mc.forge.v18.wrapper.render.BWClientRenderManager.java

@SideOnly(Side.CLIENT)
@Override//from   w  ww  . j  a  va 2s.c o m
public Vector2D getDimension(Texture texture) {
    ResourceLocation loc = toResourceLocation(texture);

    try {
        ImageInputStream in = ImageIO.createImageInputStream(
                Minecraft.getMinecraft().getResourceManager().getResource(loc).getInputStream());
        Iterator<ImageReader> readers = ImageIO.getImageReaders(in);
        if (readers.hasNext()) {
            ImageReader reader = readers.next();
            try {
                reader.setInput(in);
                return new Vector2D(reader.getWidth(0), reader.getHeight(0));
            } finally {
                reader.dispose();
            }
        }
    } catch (Exception e) {
        throw new RenderException("Couldn't load texture " + texture.getPath(), e);
    }
    return new Vector2D(16, 16);
}

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From source file:nova.core.wrapper.mc.forge.v17.wrapper.render.BWClientRenderManager.java

@SideOnly(Side.CLIENT)
@Override//from   w  w w .  ja v  a2s. c  o m
public Vector2D getDimension(Texture texture) {
    ResourceLocation loc = toResourceLocation(texture);

    try {
        ImageInputStream in = ImageIO.createImageInputStream(
                Minecraft.getMinecraft().getResourceManager().getResource(loc).getInputStream());
        Iterator<ImageReader> readers = ImageIO.getImageReaders(in);
        if (readers.hasNext()) {
            ImageReader reader = readers.next();
            try {
                reader.setInput(in);
                return new Vector2D(reader.getWidth(0), reader.getHeight(0));
            } finally {
                reader.dispose();
            }
        }
    } catch (Exception e) {
        throw new RenderException("Couldn't load texture " + texture.getPath(), e);
    }
    return super.getDimension(texture);
}

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