Loading and Saving Images with the image I/O Library
J2SE 1.4, the javax.imageio package is the primary package for the Java Image I/O API. As its name implies, this package helps you read and write image files. You might wonder what\'s so important abo
Tutorial Details:
the Image I/O libraries is what formats are supported? With Sun\'s reference implementation, you get a specific set. However, the API is flexible enough so that you can install your own formats by extending the necessary classes in the javax.imageio.spi library. For the moment, let\'s put that aspect of the library aside. To discover the installed set of readers and writers, you simply ask the ImageIO class through its getReaderFormatNames() and getWriterFormatNames() methods (or getReaderMIMETypes() and getWriterMIMETypes() if you want to work directly with MIME types). import javax.imageio.*;
public class GetList {
public static void main(String args[]) {
String readerNames[] =
ImageIO.getReaderFormatNames();
printlist(readerNames, \"Reader names:\");
String readerMimes[] =
ImageIO.getReaderMIMETypes();
printlist(readerMimes, \"Reader MIME types:\");
String writerNames[] =
ImageIO.getWriterFormatNames();
printlist(writerNames, \"Writer names:\");
String writerMimes[] =
ImageIO.getWriterMIMETypes();
printlist(writerMimes, \"Writer MIME types:\");
}
private static void printlist(String names[],
String title) {
System.out.println(title);
for (int i=0, n=names.length; i System.out.println(\"\\t\" + names[i]);
}
}
}
If you run the GetList program with Sun\'s reference implementation (and no custom providers installed), you should see the following output:
Reader names:
jpeg
gif
JPG
png
jpg
JPEG
Reader MIME types:
image/png
image/jpeg
image/x-png
image/gif
Writer names:
jpeg
JPG
png
jpg
PNG
JPEG
Writer MIME types:
image/png
image/jpeg
Basically, you get support for reading GIF, JPEG, and PNG formatted images, and for writing JPEG and PNGs. There is no GIF writer provided.
As you work with the Image I/O libraries, you might notice that almost all the work is requested through the static methods of the ImageIO class. For basic usage, these static methods are all you need. For example, to read an image, you pass the location to one of the following read methods of ImageIO:
read(File input)
read(ImageInputStream stream)
read(InputStream input)
read(URL input)
Read
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