如何在java中通过套接字发送图像数据类型 [英] How to send Image data type via socket in java
本文介绍了如何在java中通过套接字发送图像数据类型的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我真的很困惑如何通过套接字发送图像数据类型。请帮帮我。我已经了解了如何将Image数据类型转换为char [],但结果是0。
I really confused how to send an Image data type via socket. Please help me. I've searced how to convert Image data type to char[] but the result was 0.
推荐答案
您可以转换<$使用此方法c $ c>图像到 BufferedImage
( source ):
public BufferedImage toBufferedImage(final Image image, final int type) {
//Test if image does not need conversion
if (image instanceof BufferedImage)
return (BufferedImage) image;
//Check if image can be converted easily
if (image instanceof VolatileImage)
return ((VolatileImage) image).getSnapshot();
//loadImage method ensures that the image has loaded fully (it could be from the web or something). If you are sure that when this method is called - the image is loaded, you can remove this line and whole method.
loadImage(image);
//Create new BufferedImage with the same width and height and given data type (see constants in BufferedImage API)
final BufferedImage buffImg = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
//Get graphics out of our new BufferedImage. Graphics2D is used to draw something on the image
final Graphics2D g2 = buffImg.createGraphics();
//Use Graphics2D to draw our Image contents on top of BufferedImage
g2.drawImage(image, null, null);
//We no longer need our graphics object as we drawn everything we wanted
g2.dispose();
//Return BufferedImage
return buffImg;
}
//Method that ensures that the image was loaded succesfully
private void loadImage(final Image image) {
//Inner class implementing the ImageObserver interface. It will be used to track the image loading progress
class StatusObserver implements ImageObserver {
boolean imageLoaded = false;
//Each time an image updates - it will call this method
public boolean imageUpdate(final Image img, final int infoflags,
final int x, final int y, final int width, final int height) {
//When flags contains ALLBITS flag - that means that the image was fully loaded.
if (infoflags == ALLBITS) {
synchronized (this) {
//Therefore we set status to true
imageLoaded = true;
//And notify anyone who was waiting for our job to be done
notify();
}
return true;
}
return false;
}
}
//Then we create the observer itself
final StatusObserver imageStatus = new StatusObserver();
//We aquire it's monitor with this synchronized block. This will allow us to "wait" for it to complete loading (see notify() in StatusObserver)
synchronized (imageStatus) {
//Basically if image is loaded - it will have it's width and height set
if (image.getWidth(imageStatus) == -1 || image.getHeight(imageStatus) == -1) {
//While status observer is not loaded
while (!imageStatus.imageLoaded) {
try {
//We wait for status observer to notify us
imageStatus.wait();
} catch (InterruptedException ex) {}
}
}
}
}
Then, you can write the resulting BufferedImage
with ImageIO.write() method.
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