Java IIOMetadata.setFromTree方法代碼示例

import javax.imageio.metadata.IIOMetadata; //導入方法依賴的package包/類
/**
 * Paints this panel to a PNG image with specified resolution and width.
 * The image height is computed so that the image has the same aspect 
 * ratio as this panel.
 * @param dpi the image resolution, in dots per inch.
 * @param win the image width, in inches.
 * @param fileName the name of the file to contain the PNG image.
 * @throws IOException when unable to save to file.
 */
public void paintToPng(double dpi, double win, String fileName) 
  throws IOException 
{
  BufferedImage image = paintToImage((int)ceil(dpi*win));
  // The two lines below are simple, but do not write resolution info to 
  // the PNG file. We want that info, especially for high-res images.
  //File file = new File(fileName);
  //ImageIO.write(image,"png",file);
  Iterator<ImageWriter> i = ImageIO.getImageWritersBySuffix("png");
  if (!i.hasNext())
    throw new IOException("cannot get a PNG image writer");
  ImageWriter iw = i.next();
  FileOutputStream fos = new FileOutputStream(fileName);
  ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
  iw.setOutput(ios);
  ImageWriteParam iwp = iw.getDefaultWriteParam();
  ImageTypeSpecifier its = new ImageTypeSpecifier(image);
  IIOMetadata imd = iw.getDefaultImageMetadata(its,iwp);
  String format = "javax_imageio_png_1.0";
  IIOMetadataNode tree = (IIOMetadataNode)imd.getAsTree(format);
  IIOMetadataNode node = new IIOMetadataNode("pHYs");
  String dpm = Integer.toString((int)ceil(dpi/0.0254));
  node.setAttribute("pixelsPerUnitXAxis",dpm);
  node.setAttribute("pixelsPerUnitYAxis",dpm);
  node.setAttribute("unitSpecifier","meter");
  tree.appendChild(node);
  imd.setFromTree(format,tree);
  iw.write(new IIOImage(image,null,imd));
  ios.flush();
  ios.close();
  fos.flush();
  fos.close();
  iw.dispose();
}
 

import javax.imageio.metadata.IIOMetadata; //導入方法依賴的package包/類
/**
 * Configures the per frame metadata
 * 
 * @param meta the default meta data
 * @param delayTime the amount of time a frame is to stay on screen in hundreds of a second (millisecond value/10)
 * @param imageIndex the index of this frame
 * @throws IIOInvalidTreeException if the meta data cannot be set
 */
private void configureMetaData(IIOMetadata meta, String delayTime, int imageIndex) throws IIOInvalidTreeException {
	String metaFormat = meta.getNativeMetadataFormatName();
	Node root = meta.getAsTree(metaFormat);
	Node child = root.getFirstChild();
	while (child != null) {
		if ("GraphicControlExtension".equals(child.getNodeName())) {
			break;
		}
		child = child.getNextSibling();
	}
	IIOMetadataNode gce = (IIOMetadataNode) child;
	gce.setAttribute("userDelay", "FALSE");
	gce.setAttribute("delayTime", delayTime);
	gce.setAttribute("disposalMethod", "none");

	if (imageIndex == 0) {
		IIOMetadataNode aes = new IIOMetadataNode("ApplicationExtensions");
		IIOMetadataNode ae = new IIOMetadataNode("ApplicationExtension");
		ae.setAttribute("applicationID", "NETSCAPE");
        ae.setAttribute("authenticationCode", "2.0");
		byte[] uo = new byte[] { 0x1, (byte) (LOOP_COUNT & 0xFF), (byte) ((LOOP_COUNT >> 8) & 0xFF) };
		ae.setUserObject(uo);
		aes.appendChild(ae);
		root.appendChild(aes);
	}
	meta.setFromTree(metaFormat, root);		
}
 

import javax.imageio.metadata.IIOMetadata; //導入方法依賴的package包/類
public static void main(String[] args) throws IIOInvalidTreeException {

        // getting the writer for the png format
        Iterator iter = ImageIO.getImageWritersByFormatName("png");
        ImageWriter writer = (ImageWriter) iter.next();

        // creating a color model
        ColorModel colorModel = ColorModel.getRGBdefault();

        // creating a sample model
        SampleModel sampleModel = colorModel.createCompatibleSampleModel(640, 480);

        // creating a default metadata object
        IIOMetadata metaData = writer.getDefaultImageMetadata(new ImageTypeSpecifier(colorModel, sampleModel), null);
        String formatName = metaData.getNativeMetadataFormatName();

        // first call
        Node metaDataNode = metaData.getAsTree(formatName);
        try {
            metaData.setFromTree(formatName, metaDataNode);
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        // second call (bitdepht is already set to an invalid value)
        metaDataNode = metaData.getAsTree(formatName);

        metaData.setFromTree(formatName, metaDataNode);

    }
 

import javax.imageio.metadata.IIOMetadata; //導入方法依賴的package包/類
private static void writeTo(File f, ITXtTest t) {
    BufferedImage src = createBufferedImage();
    try {
        ImageOutputStream imageOutputStream =
            ImageIO.createImageOutputStream(f);

        ImageTypeSpecifier imageTypeSpecifier =
            new ImageTypeSpecifier(src);
        ImageWriter imageWriter =
            ImageIO.getImageWritersByFormatName("PNG").next();

        imageWriter.setOutput(imageOutputStream);

        IIOMetadata m =
            imageWriter.getDefaultImageMetadata(imageTypeSpecifier, null);

        String format = m.getNativeMetadataFormatName();
        Node root = m.getAsTree(format);

        IIOMetadataNode iTXt = t.getNode();
        root.appendChild(iTXt);
        m.setFromTree(format, root);

        imageWriter.write(new IIOImage(src, null, m));
        imageOutputStream.close();
        System.out.println("Writing done.");
    } catch (Throwable e) {
        throw new RuntimeException("Writing test failed.", e);
    }
}
 

import javax.imageio.metadata.IIOMetadata; //導入方法依賴的package包/類
private static void writeTo(File f, ITXtTest t) {
    BufferedImage src = createBufferedImage();
    try (ImageOutputStream imageOutputStream =
            ImageIO.createImageOutputStream(f)) {

        ImageTypeSpecifier imageTypeSpecifier =
            new ImageTypeSpecifier(src);
        ImageWriter imageWriter =
            ImageIO.getImageWritersByFormatName("PNG").next();

        imageWriter.setOutput(imageOutputStream);

        IIOMetadata m =
            imageWriter.getDefaultImageMetadata(imageTypeSpecifier, null);

        String format = m.getNativeMetadataFormatName();
        Node root = m.getAsTree(format);

        IIOMetadataNode iTXt = t.getNode();
        root.appendChild(iTXt);
        m.setFromTree(format, root);

        imageWriter.write(new IIOImage(src, null, m));
        System.out.println("Writing done.");
    } catch (Throwable e) {
        throw new RuntimeException("Writing test failed.", e);
    }
}