ImageIO什么时候应该停止从InputStream读取？

Question

I am trying make a server that receives a JPG image over the newtork in Java.

isr = socket.getInputStream();
BufferedImage img = ImageIO.read(isr);

I would like to finish reading, but keep the socket connection. ImageIO stops only when I close the connection. It also stops when I send the same image twice.

Answer 1

ImageIO.read should continue reading from the input stream until it has the entire file, at which point it stops reading. It is then teh responsibility of the caller to call close on the input stream.

You don't send any data from the client to the server to tell it you are done reading. Just close the connection.

If the server sends the same image twice, or sends two different images, you must make two socket connections, or use some other method to read the data. To the best of my knowledge, there's no way for ImageIO.read to read two images.