Swing/IIOMetadata のバックアップの現在との差分(No.3)

Jpegファイルのコメントを取り出す

概要

#screenshot

サンプルコード

#spanend
#spanadd
* サンプルコード [#sourcecode]
#spanend
#spanadd
#code(link){{
#spanend
InputStream source = getClass().getResourceAsStream("test.jpg");
Iterator readers = ImageIO.getImageReadersByFormatName("jpeg");
#spandel
ImageReader reader = (ImageReader)readers.next();
#spanend
#spandel
//FileInputStream source = new FileInputStream(new File("c:/tmp/test.jpg"));
#spanend
#spanadd
ImageReader reader = (ImageReader) readers.next();
#spanend
#spanadd
// FileInputStream source = new FileInputStream(new File("c:/tmp/test.jpg"));
#spanend
ImageInputStream iis = ImageIO.createImageInputStream(source);
reader.setInput(iis, true);

#spandel
//[[MediaTrackerで画像のサイズを取得>Swing/MediaTracker]]
#spanend
#spandel
//ImageReadParam param = reader.getDefaultReadParam();
#spanend
#spandel
//buf.append(String.format("Width: %d\n", reader.getWidth(0)));
#spanend
#spandel
//buf.append(String.format("Height: %d\n", reader.getHeight(0)));
#spanend
#spanadd
// [[MediaTrackerで画像のサイズを取得>Swing/MediaTracker]]
#spanend
#spanadd
// ImageReadParam param = reader.getDefaultReadParam();
#spanend
#spanadd
// buf.append(String.format("Width: %d%n", reader.getWidth(0)));
#spanend
#spanadd
// buf.append(String.format("Height: %d%n", reader.getHeight(0)));
#spanend

IIOMetadata meta = reader.getImageMetadata(0);
#spandel
//for(String s:meta.getMetadataFormatNames())
#spanend
#spandel
//  buf.append(String.format("MetadataFormatName: %s\n",s));
#spanend
#spanadd
// for (String s: meta.getMetadataFormatNames())
#spanend
#spanadd
//   buf.append(String.format("MetadataFormatName: %s%n",s));
#spanend

#spandel
IIOMetadataNode root = (IIOMetadataNode)meta.getAsTree("javax_imageio_jpeg_image_1.0");
#spanend
#spandel
//root = (IIOMetadataNode) meta.getAsTree("javax_imageio_1.0");
#spanend
#spanadd
IIOMetadataNode root = (IIOMetadataNode) meta.getAsTree("javax_imageio_jpeg_image_1.0");
#spanend
#spanadd
// root = (IIOMetadataNode) meta.getAsTree("javax_imageio_1.0");
#spanend

NodeList com = root.getElementsByTagName("com");
#spandel
if(com!=null && com.getLength()>0) {
#spanend
  String comment = ((IIOMetadataNode)com.item(0)).getAttribute("comment");
  buf.append(String.format("Comment: %s\n", comment));
#spanadd
if (com != null && com.getLength() > 0) {
#spanend
  String comment = ((IIOMetadataNode) com.item(0)).getAttribute("comment");
  buf.append(String.format("Comment: %s%n", comment));
}

• &jnlp;
• &jar;
• &zip;

1. ImageReaderから、IIOMetadataを取得
2. IIOMetadataからXMLのDOM(org.w3c.dom.Node)形式でデータを取得
3. comタグのcomment属性からコメントを取得

解説

参考リンク

コメント