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The Java Developers Almanac 1.4Order this book from Amazon. |
e696. Listing the Image Formats That Can Be Read and WrittenBy default, thejavax.imageio package can read GIF, PNG, and JPEG
images and can write PNG and JPEG images. The complete list of
available readable and writeable formats can be retrieved by calling
ImageIO.getReaderFormatNames() and
ImageIO.getWriterFormatNames() .
Note: These methods may return the format name in both lowercase
and uppercase. This example implements a // Get list of unique supported read formats String[] formatNames = ImageIO.getReaderFormatNames(); formatNames = unique(formatNames); // e.g. png jpeg gif jpg // Get list of unique supported write formats formatNames = ImageIO.getWriterFormatNames(); formatNames = unique(formatNames); // e.g. png jpeg jpg // Get list of unique MIME types that can be read formatNames = ImageIO.getReaderMIMETypes(); formatNames = unique(formatNames); // e.g image/jpeg image/png image/x-png image/gif // Get list of unique MIME types that can be written formatNames = ImageIO.getWriterMIMETypes(); formatNames = unique(formatNames); // e.g. image/jpeg image/png image/x-png // Converts all strings in 'strings' to lowercase // and returns an array containing the unique values. // All returned values are lowercase. public static String[] unique(String[] strings) { Set set = new HashSet(); for (int i=0; i<strings.length; i++) { String name = strings[i].toLowerCase(); set.add(name); } return (String[])set.toArray(new String[0]); }
e695. Saving a Generated Graphic to a PNG or JPEG File e697. Determining If an Image Format Can Be Read or Written e698. Determining the Format of an Image in a File e699. Compressing a JPEG File © 2002 Addison-Wesley. |