Question

The problem I am having is that when I use an InputStream to read bytes, it blocks until the connection is finished. EG:

        InputStream is = socket.getInputStream();
        byte[] buffer = new byte[20000];
        while (is.read(buffer) != -1) {
            System.out.println("reading");
        }
        System.out.println("socket read");

“socket read” doesn’t print out until the FYN packet is actually recieved, thus closing the connection. What is the proper way to receive all the bytes in without blocking and waiting for the connection to drop?

Answer 1

Try this:

        InputStream is = socket.getInputStream();
        byte[] buffer = new byte[20000];
        int bytesRead;
        do {
            System.out.println("reading");
            bytesRead = is.read(buffer);
        }
        while (is.available() > 0 && bytesRead != -1);
        System.out.println("socket read");

More info: https://docs.oracle.com/javase/1.5.0/docs/api/java/io/InputStream.html#available()