Java by API/javax.imageio/ImageIO
Содержание
- 1 ImageIO: createImageInputStream(Object input)
- 2 ImageIO: getImageReadersByFormatName(String formatName)
- 3 ImageIO: getImageReadersByMIMEType(String MIMEType)
- 4 ImageIO: getImageReadersBySuffix(String fileSuffix)
- 5 ImageIO: getImageReaders(Object input)
- 6 ImageIO: getImageWritersByFormatName(String formatName)
- 7 ImageIO: getImageWritersByMIMEType(String MIMEType)
- 8 ImageIO: getImageWritersBySuffix(String fileSuffix)
- 9 ImageIO: getReaderFormatNames()
- 10 ImageIO: getReaderMIMETypes()
- 11 ImageIO: getWriterFormatNames()
- 12 ImageIO: getWriterMIMETypes()
- 13 ImageIO: read(File input)
- 14 ImageIO: read(URL input)
- 15 ImageIO: write(RenderedImage im, String formatName, File output)
ImageIO: createImageInputStream(Object input)
<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>
ImageIO: getImageReadersByFormatName(String formatName)
<source lang="java">
import java.io.File; import java.util.Iterator; import javax.imageio.ImageIO; public class Main {
public static void main(String[] argv) throws Exception {
boolean b;
// Check availability using a format name
b = canReadFormat("foo"); // false
b = canReadFormat("gif"); // true
b = canReadFormat("giF"); // true
}
// Returns true if the specified format name can be read
public static boolean canReadFormat(String formatName) {
Iterator iter = ImageIO.getImageReadersByFormatName(formatName);
return iter.hasNext();
}
}
</source>
ImageIO: getImageReadersByMIMEType(String MIMEType)
<source lang="java">
import java.util.Iterator; import javax.imageio.ImageIO; public class Main {
public static void main(String[] argv) throws Exception {
boolean b;
b = canReadMimeType("image/jpg"); // false
b = canReadMimeType("image/jpeg"); // true
}
// Returns true if the specified mime type can be read
public static boolean canReadMimeType(String mimeType) {
Iterator iter = ImageIO.getImageReadersByMIMEType(mimeType);
return iter.hasNext();
}
}
</source>
ImageIO: getImageReadersBySuffix(String fileSuffix)
<source lang="java">
import java.io.File; import java.util.Iterator; import javax.imageio.ImageIO; public class Main {
public static void main(String[] argv) throws Exception {
boolean b;
// Check availability using a format name
b = canReadExtension("foo"); // false
b = canReadExtension("gif"); // true
b = canReadExtension("giF"); // true
}
// Returns true if the specified file extension can be read
public static boolean canReadExtension(String fileExt) {
Iterator iter = ImageIO.getImageReadersBySuffix(fileExt);
return iter.hasNext();
}
}
</source>
ImageIO: getImageReaders(Object input)
<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>
ImageIO: getImageWritersByFormatName(String formatName)
<source lang="java">
import java.util.Iterator; import javax.imageio.ImageIO; public class Main {
public static void main(String[] argv) throws Exception {
boolean b;
// Check availability using a format name
b = canWriteFormat("foo"); // false
b = canWriteFormat("gif"); // true
b = canWriteFormat("giF"); // true
}
public static boolean canWriteFormat(String formatName) {
Iterator iter = ImageIO.getImageWritersByFormatName(formatName);
return iter.hasNext();
}
}
</source>
ImageIO: getImageWritersByMIMEType(String MIMEType)
<source lang="java">
import java.io.File; import java.util.Iterator; import javax.imageio.ImageIO; public class Main {
public static void main(String[] argv) throws Exception {
boolean b;
b = canWriteMimeType("image/jpg"); // false
b = canWriteMimeType("image/jpeg"); // true
}
// Returns true if the specified mime type can be written
public static boolean canWriteMimeType(String mimeType) {
Iterator iter = ImageIO.getImageWritersByMIMEType(mimeType);
return iter.hasNext();
}
}
</source>
ImageIO: getImageWritersBySuffix(String fileSuffix)
<source lang="java">
import java.util.Iterator; import javax.imageio.ImageIO; public class Main {
public static void main(String[] argv) throws Exception {
boolean b;
// Check availability using a format name
b = canWriteExtension("foo"); // false
b = canWriteExtension("gif"); // true
b = canWriteExtension("giF"); // true
}
// Returns true if the specified file extension can be written
public static boolean canWriteExtension(String fileExt) {
Iterator iter = ImageIO.getImageWritersBySuffix(fileExt);
return iter.hasNext();
}
}
</source>
ImageIO: getReaderFormatNames()
<source lang="java">
/* reader BMP reader bmp reader jpeg reader wbmp reader gif reader png reader JPG reader jpg reader WBMP reader JPEG writer BMP writer bmp writer jpeg writer wbmp writer png writer JPG writer PNG writer jpg writer WBMP writer JPEG
- /
import javax.imageio.ImageIO; public class Main {
static public void main(String args[]) throws Exception {
String names[] = ImageIO.getReaderFormatNames();
for (int i = 0; i < names.length; ++i) {
System.out.println("reader " + names[i]);
}
names = ImageIO.getWriterFormatNames();
for (int i = 0; i < names.length; ++i) {
System.out.println("writer " + names[i]);
}
}
}
</source>
ImageIO: getReaderMIMETypes()
<source lang="java">
import javax.imageio.ImageIO; public class Main {
public static void main(String[] args) {
String[] readers, writers;
System.out.println("For Reading:");
readers = ImageIO.getReaderFormatNames();
System.out.println("\tBy format:");
for (int i = 0; i < readers.length; i++)
System.out.println("\t\t" + readers[i]);
readers = ImageIO.getReaderMIMETypes();
System.out.println("\tBy MIME Types:");
for (int i = 0; i < readers.length; i++)
System.out.println("\t\t" + readers[i]);
System.out.println("For Writing:");
writers = ImageIO.getWriterFormatNames();
System.out.println("\tBy format:");
for (int i = 0; i < writers.length; i++)
System.out.println("\t\t" + writers[i]);
writers = ImageIO.getWriterMIMETypes();
System.out.println("\tBy MIME Types:");
for (int i = 0; i < writers.length; i++)
System.out.println("\t\t" + writers[i]);
}
}
</source>
ImageIO: getWriterFormatNames()
<source lang="java">
/* reader BMP reader bmp reader jpeg reader wbmp reader gif reader png reader JPG reader jpg reader WBMP reader JPEG writer BMP writer bmp writer jpeg writer wbmp writer png writer JPG writer PNG writer jpg writer WBMP writer JPEG
- /
import javax.imageio.ImageIO; public class Main {
static public void main(String args[]) throws Exception {
String names[] = ImageIO.getReaderFormatNames();
for (int i = 0; i < names.length; ++i) {
System.out.println("reader " + names[i]);
}
names = ImageIO.getWriterFormatNames();
for (int i = 0; i < names.length; ++i) {
System.out.println("writer " + names[i]);
}
}
}
</source>
ImageIO: getWriterMIMETypes()
<source lang="java">
import javax.imageio.ImageIO; public class Main {
public static void main(String[] args) {
String[] readers, writers;
System.out.println("For Reading:");
readers = ImageIO.getReaderFormatNames();
System.out.println("\tBy format:");
for (int i = 0; i < readers.length; i++)
System.out.println("\t\t" + readers[i]);
readers = ImageIO.getReaderMIMETypes();
System.out.println("\tBy MIME Types:");
for (int i = 0; i < readers.length; i++)
System.out.println("\t\t" + readers[i]);
System.out.println("For Writing:");
writers = ImageIO.getWriterFormatNames();
System.out.println("\tBy format:");
for (int i = 0; i < writers.length; i++)
System.out.println("\t\t" + writers[i]);
writers = ImageIO.getWriterMIMETypes();
System.out.println("\tBy MIME Types:");
for (int i = 0; i < writers.length; i++)
System.out.println("\t\t" + writers[i]);
}
}
</source>
ImageIO: read(File input)
<source lang="java">
import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.File; import javax.imageio.ImageIO; import javax.swing.JFrame; public class Main extends JFrame {
private BufferedImage bi;
public static void main(String[] args) {
new Main ().setVisible(true);
}
public Main () {
setDefaultCloseOperation(EXIT_ON_CLOSE);
try {
bi = ImageIO.read(new File("your.jpg"));
} catch (Exception e) {
e.printStackTrace();
}
setSize(bi.getWidth(), bi.getHeight());
}
public void paint(Graphics g) {
g.drawImage(bi, 0, 0, getWidth(), getHeight(), this);
}
}
</source>
ImageIO: read(URL input)
<source lang="java">
import java.awt.BorderLayout; import java.awt.Image; import java.net.URL; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; public class Main {
public static void main(String[] argv) throws Exception {
// Read from a URL
URL url = new URL("http://java.org/source.gif");
Image image = ImageIO.read(url);
JFrame frame = new JFrame();
JLabel label = new JLabel(new ImageIcon(image));
frame.getContentPane().add(label, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
}
</source>
ImageIO: write(RenderedImage im, String formatName, File output)
<source lang="java">
import java.awt.Color; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.File; import javax.imageio.ImageIO; public class Main {
final static int WIDTH = 50;
final static int HEIGHT = 50;
final static int NUM_ITER = 1500;
public static void main(String[] args) throws Exception {
BufferedImage bi;
bi = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
Graphics g = bi.getGraphics();
for (int i = 0; i < NUM_ITER; i++) {
g.setColor(Color.RED);
g.drawLine(1, 2, i, i + 1);
}
g.dispose();
ImageIO.write(bi, "gif", new File("image.gif"));
}
}
</source>
