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5.0

TCP/IP disconnection detection

Asked by adlabac in Java Programming Language

Tags: socket, disconnect, detection

Hi,

I am writing some Telnet client and I have a problem. Namely, I found no way to detect when server disconnect me (other than to send a few strings and wait for exception). Here is the code:

public static void main(String[] args)
{
    Socket socket;
    InputStream in;
    OutputStream out;

    try
    {
        socket = new Socket("192.168.81.146",23);
        in = socket.getInputStream();
        out = socket.getOutputStream();
        BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
        boolean theEnd = false;

        while(!theEnd)
        {
            try
            {
                if (keyboard.ready())
                {
                    String command = keyboard.readLine();
                    command = command + "\r";
                    out.write(command.getBytes());
                    out.flush();
                }
            }
            catch (IOException e)
            {
                kraj = true;
                System.err.println (e);
            }
            if (in.available() > 0)
            {
                byte[] b = new byte[in.available()];
                int len = in.read(b);
                String text = new String (b,0,len);
                System.out.print (text);
            }
            try
            {
                Thread.sleep(100);
            }
            catch (InterruptedException ie)
            {
                return;
            }
            if (!socket.isBound() || !socket.isConnected() || socket.isClosed() ||
                 socket.isInputShutdown() || socket.isOutputShutdown()) theEnd = true;
        }
        in.close();
        out.close();
        socket.close();
    }
    catch (IOException ioe)
    {
        System.err.println (ioe);
    }
}

None of the methods used to detect if the connection is active (isBound, isConnected, isClosed, isInputShutdown, isOutputShutdown) worked, though the connection is down. I tried to set the timeout to 25, but nothing happened.

Any ideas?

Best regards,
  Sasha
 
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About this solution

Zone: Java Programming Language
Tags: socket, disconnect, detection
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Solution Provided By: krakatoa
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Solution Grade: A
 
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