可以读取并使用从ImageReadParamImageIO
包图像的显示片段。下面是说明如何读取使用ImageReadParam
单一片段,而不必读取整个图像的基本示例:
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import javax.swing.*;
public class TestImageChunks {
private static void createAndShowUI() {
try {
URL url = new URL(
"http://duke.kenai.com/wave/.Midsize/Wave.png.png");
Image chunk = readFragment(url.openStream(), new Rectangle(150,
150, 300, 250));
JOptionPane.showMessageDialog(null, new ImageIcon(chunk), "Duke",
JOptionPane.INFORMATION_MESSAGE);
} catch (IOException e) {
JOptionPane.showMessageDialog(null, e.getMessage(), "Failure",
JOptionPane.ERROR_MESSAGE);
e.printStackTrace();
}
}
public static BufferedImage readFragment(InputStream stream, Rectangle rect)
throws IOException {
ImageInputStream imageStream = ImageIO.createImageInputStream(stream);
ImageReader reader = ImageIO.getImageReaders(imageStream).next();
ImageReadParam param = reader.getDefaultReadParam();
param.setSourceRegion(rect);
reader.setInput(imageStream, true, true);
BufferedImage image = reader.read(0, param);
reader.dispose();
imageStream.close();
return image;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowUI();
}
});
}
}
结果看起来像这样:
感谢您的宝贵意见,我会尝试这一点,让你知道。 – Mihir 2013-03-01 06:55:56
我成功实施了您的解决方案并且工作正常。请帮助我在这个问题以及http://stackoverflow.com/questions/15438506/how-do-i-convert-an-enormous-tiff-image-to-png-jpeg-without-out-of-memory -错误 – Mihir 2013-03-15 17:24:15