Java by API/javax.imageio/ImageReader
Содержание
ImageReader: addIIOReadProgressListener(IIOReadProgressListener listener)
<source lang="java">
import java.awt.image.BufferedImage; import java.io.File; import java.io.FileInputStream; import java.util.Iterator; import javax.imageio.ImageIO; import javax.imageio.ImageReader; import javax.imageio.ImageWriter; import javax.imageio.event.IIOReadProgressListener; import javax.imageio.stream.ImageInputStream; import javax.imageio.stream.ImageOutputStream; public class Main{
static public void main(String args[]) throws Exception {
FileInputStream fin = new FileInputStream("a.gif");
Iterator readers = ImageIO.getImageReadersBySuffix("GIF");
ImageReader imageReader = (ImageReader) readers.next();
ImageInputStream iis = ImageIO.createImageInputStream(fin);
imageReader.setInput(iis, false);
imageReader.addIIOReadProgressListener(new IIOReadProgressListener() {
public void imageComplete(ImageReader source) {
System.out.println("image complete " + source);
}
public void imageProgress(ImageReader source, float percentageDone) {
System.out.println("image progress " + source + ": " + percentageDone + "%");
}
public void imageStarted(ImageReader source, int imageIndex) {
System.out.println("image #" + imageIndex + " started " + source);
}
public void readAborted(ImageReader source) {
System.out.println("read aborted " + source);
}
public void sequenceComplete(ImageReader source) {
System.out.println("sequence complete " + source);
}
public void sequenceStarted(ImageReader source, int minIndex) {
System.out.println("sequence started " + source + ": " + minIndex);
}
public void thumbnailComplete(ImageReader source) {
System.out.println("thumbnail complete " + source);
}
public void thumbnailProgress(ImageReader source, float percentageDone) {
System.out.println("thumbnail started " + source + ": " + percentageDone + "%");
}
public void thumbnailStarted(ImageReader source, int imageIndex, int thumbnailIndex) {
System.out.println("thumbnail progress " + source + ", " + thumbnailIndex + " of "
+ imageIndex);
}
});
BufferedImage image = imageReader.read(0);
Iterator imageWriters = ImageIO.getImageWritersBySuffix("JPG");
ImageWriter imageWriter = (ImageWriter) imageWriters.next();
File file = new File("b.JPG");
ImageOutputStream ios = ImageIO.createImageOutputStream(file);
imageWriter.setOutput(ios);
imageWriter.write(image);
}
}
</source>
ImageReader: getFormatName()
<source lang="java">
import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.util.Iterator; import javax.imageio.ImageIO; import javax.imageio.ImageReader; import javax.imageio.stream.ImageInputStream; public class Main {
public static void main(String[] argv) throws Exception {
File file = new File("image.gif");
System.out.println(getFormatName(file));
InputStream is = new FileInputStream(file);
is.close();
System.out.println(getFormatName(is));
}
private static String getFormatName(Object o) {
try {
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;
}
}
</source>
ImageReader: getNumImages(boolean allowSearch)
<source lang="java">
import java.awt.Graphics; import java.awt.Panel; import java.awt.image.BufferedImage; import java.io.FileInputStream; import java.util.Iterator; import javax.imageio.ImageIO; import javax.imageio.ImageReader; import javax.imageio.stream.ImageInputStream; import javax.swing.JFrame; public class Main extends Panel{
private BufferedImage images[];
private int imageIndex = 0;
public Main(String filename) throws Exception{
FileInputStream fin = new FileInputStream(filename);
String suffix = filename.substring(filename.lastIndexOf(".") + 1);
System.out.println("suf " + suffix);
Iterator readers = ImageIO.getImageReadersBySuffix(suffix);
ImageReader imageReader = (ImageReader) readers.next();
ImageInputStream iis = ImageIO.createImageInputStream(fin);
imageReader.setInput(iis, false);
int num = imageReader.getNumImages(true);
images = new BufferedImage[num];
for (int i = 0; i < num; ++i) {
images[i] = imageReader.read(i);
}
fin.close();
}
public void paint(Graphics g) {
if (images == null)
return;
g.drawImage(images[imageIndex], 0, 0, null);
imageIndex = (imageIndex + 1) % images.length;
}
static public void main(String args[]) throws Exception {
JFrame frame = new JFrame("ShowImageIR.java");
Panel panel = new Main(args[0]);
frame.getContentPane().add(panel);
frame.setSize(400, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
</source>
ImageReader: read(int imageIndex)
<source lang="java">
import java.awt.Graphics; import java.awt.Panel; import java.awt.image.BufferedImage; import java.io.FileInputStream; import java.util.Iterator; import javax.imageio.ImageIO; import javax.imageio.ImageReader; import javax.imageio.stream.ImageInputStream; import javax.swing.JFrame; public class Main extends Panel{
private BufferedImage images[];
private int imageIndex = 0;
public Main(String filename) throws Exception{
FileInputStream fin = new FileInputStream(filename);
String suffix = filename.substring(filename.lastIndexOf(".") + 1);
System.out.println("suf " + suffix);
Iterator readers = ImageIO.getImageReadersBySuffix(suffix);
ImageReader imageReader = (ImageReader) readers.next();
ImageInputStream iis = ImageIO.createImageInputStream(fin);
imageReader.setInput(iis, false);
int num = imageReader.getNumImages(true);
images = new BufferedImage[num];
for (int i = 0; i < num; ++i) {
images[i] = imageReader.read(i);
}
fin.close();
}
public void paint(Graphics g) {
if (images == null)
return;
g.drawImage(images[imageIndex], 0, 0, null);
imageIndex = (imageIndex + 1) % images.length;
}
static public void main(String args[]) throws Exception {
JFrame frame = new JFrame("ShowImageIR.java");
Panel panel = new Main(args[0]);
frame.getContentPane().add(panel);
frame.setSize(400, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
</source>
ImageReader: setInput(Object input, boolean seekForwardOnly)
<source lang="java">
import java.awt.Graphics; import java.awt.Panel; import java.awt.image.BufferedImage; import java.io.FileInputStream; import java.util.Iterator; import javax.imageio.ImageIO; import javax.imageio.ImageReader; import javax.imageio.stream.ImageInputStream; import javax.swing.JFrame; public class Main extends Panel{
private BufferedImage images[];
private int imageIndex = 0;
public Main(String filename) throws Exception{
FileInputStream fin = new FileInputStream(filename);
String suffix = filename.substring(filename.lastIndexOf(".") + 1);
System.out.println("suf " + suffix);
Iterator readers = ImageIO.getImageReadersBySuffix(suffix);
ImageReader imageReader = (ImageReader) readers.next();
ImageInputStream iis = ImageIO.createImageInputStream(fin);
imageReader.setInput(iis, false);
int num = imageReader.getNumImages(true);
images = new BufferedImage[num];
for (int i = 0; i < num; ++i) {
images[i] = imageReader.read(i);
}
fin.close();
}
public void paint(Graphics g) {
if (images == null)
return;
g.drawImage(images[imageIndex], 0, 0, null);
imageIndex = (imageIndex + 1) % images.length;
}
static public void main(String args[]) throws Exception {
JFrame frame = new JFrame("ShowImageIR.java");
Panel panel = new Main(args[0]);
frame.getContentPane().add(panel);
frame.setSize(400, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
</source>
