java创建BufferedImage示例，bufferedimage示例,package cn.o

java创建BufferedImage示例，bufferedimage示例,package cn.o

package cn.outofmemory.snippets.desktop;import java.awt.Component;import java.awt.Frame;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.GraphicsConfiguration;import java.awt.GraphicsDevice;import java.awt.GraphicsEnvironment;import java.awt.Image;import java.awt.Toolkit;import java.awt.Transparency;import java.awt.image.BufferedImage;import java.awt.image.ImageObserver;public class ImageToBufferedImage {  static BufferedImage image;  static boolean imageLoaded = false;  public static void main(String[] args) {      // The ImageObserver implementation to observe loading of the image      ImageObserver myImageObserver = new ImageObserver() {        public boolean imageUpdate(Image image, int flags, int x, int y, int width, int height) {          if ((flags & ALLBITS) != 0) {            imageLoaded = true;            System.out.println("Image loading finished!");            return false;          }          return true;        }      };      // The image URL - change to where your image file is located!      String imageURL = "image.png";      /*        * This call returns immediately and pixels are loaded in the background        * We use an ImageObserver to be notified when the loading of the image        * is complete        */      Image sourceImage = Toolkit.getDefaultToolkit().getImage(imageURL);      sourceImage.getWidth(myImageObserver);      // We wait until the image is fully loaded      while (!imageLoaded) {          try {              Thread.sleep(100);          } catch (InterruptedException e) {          }      }      // Create a buffered image from the source image with a format that's compatible with the screen      GraphicsEnvironment graphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment();      GraphicsDevice graphicsDevice = graphicsEnvironment.getDefaultScreenDevice();      GraphicsConfiguration graphicsConfiguration = graphicsDevice.getDefaultConfiguration();      // If the source image has no alpha info use Transparency.OPAQUE instead      image = graphicsConfiguration.createCompatibleImage(sourceImage.getWidth(null), sourceImage.getHeight(null), Transparency.BITMASK);      // Copy image to buffered image      Graphics graphics = image.createGraphics();      // Paint the image onto the buffered image      graphics.drawImage(sourceImage, 0, 0, null);      graphics.dispose();      // Create frame with specific title      Frame frame = new Frame("Example Frame");      // Add a component with a custom paint method      frame.add(new CustomPaintComponent());      // Display the frame      int frameWidth = 300;      int frameHeight = 300;      frame.setSize(frameWidth, frameHeight);      frame.setVisible(true);  }  /*   * To draw on the screen, it is first necessary to subclass a Component and   * override its paint() method. The paint() method is automatically called   * by the windowing system whenever component's area needs to be repainted.   */  static class CustomPaintComponent extends Component {      public void paint(Graphics g) {          // Retrieve the graphics context; this object is used to paint          // shapes          Graphics2D g2d = (Graphics2D) g;          /*           * Draw an Image object The coordinate system of a graphics context           * is such that the origin is at the northwest corner and x-axis           * increases toward the right while the y-axis increases toward the           * bottom.           */          int x = 0;          int y = 0;          g2d.drawImage(image, x, y, this);      }  }}