Question

I am working on a server/client communication program and I am stuck at a problem. When I try to send messages from my client side it won’t work properly. After initializing the server, I connect the client and that is successful. When I try to send messages from the client, the server won’t receive them. After I close the client connection, the server receives all of the messages I attempted to send earlier. The following class is what I am using:

public class ServerSender extends Thread
{
    private DataOutputStream out = new DataOutputStream(socket.getOutputStream());
    private Scanner kb = new Scanner(System.in);

    public void run()
    {
        while(true)
        {
            try
            {
                out.writeUTF(kb.nextLine());
                out.flush();
            } catch(IOException e) { System.out.println("error"); }
        }
    }
}

Any help would be much appreciated, thanks.

Answer 1

DataOutputStream doesn’t have a buffer to flush, so your diagnosis is incorrect. However you need to be aware that writeUTF() writes a format that only DataInputStream.readUTF() can read. If you’re trying to write lines you have the wrong API: try BufferedWriter.write()/.newLine().