Problem on image transfer using Socket

Question

There are a server and a client,
server executes the code:
ImageIO.write( bufferedImage, "jpg", outputStream );
System.out.println("writed");client executes the code:
BufferedImage bufferedImage = ImageIO.read( inputStream );
System.out.println("read");The problem is that the string "writed" is displayed at the console of the server, but the client is blocking at the method ImageIO.read().
However, when I add one more line of code to the server:
ImageIO.write( bufferedImage, "jpg", outputStream );
outputStream.close();
System.out.println("writed");The problem is solved but I don't want to close the outputStream.
I would like to ask is there any idea to solve this problem without close the outputStream?
Thank you very much.

Answer 1

I would like to ask is there any idea to solve this
problem without close the outputStream?Send a message not data.
You now just shove data down the pipe. The other end has no way to know when the data has arrived.
Wrapping data in a message provides a way to determine that all of the data has arrived. This also means that you need a communication API. That is an api that
1. Takes data as input
2. Packages it in a message.
3. Sends the message.
4. Recieves a message
5. Unpackages the data
6. Returns the data as output.