java BufferedReader specific length returns NUL characters

Question

I have a TCP socket client receiving messages (data) from a server. messages are of the type length (2 bytes) + data (length bytes), delimited by STX & ETX characters.

Answer 1

Here is a sample server that I have used for testing The main rcv is structured like

while((chars_read = from_server.read(buffer)) != -1)
{
    to_user.write(buffer,0,chars_read);
    to_user.flush();
}

The actual whole server is below ...

   public static void main(String[] args) throws IOException
   {
      try
      {
         if (args.length != 2)
            throw new IllegalArgumentException("Wrong number of Args");

         String   host = args[0];
         int      port = Integer.parseInt(args[1]);

         Socket   s = new Socket(host,port);

         final Reader from_server = new InputStreamReader(s.getInputStream());
         PrintWriter to_server = new PrintWriter(new OutputStreamWriter(s.getOutputStream()));

         BufferedReader from_user = new BufferedReader(new InputStreamReader(System.in));
         final PrintWriter to_user = new PrintWriter(new OutputStreamWriter(System.out));

         to_user.println("Connected to " + s.getInetAddress() + ":" + s.getPort());

         Thread t = new Thread()
         {
            public void run()
            {
               char [] buffer = new char[1024];
               int chars_read;
               try
               {
                  while((chars_read = from_server.read(buffer)) != -1)
                  {
                     to_user.write(buffer,0,chars_read);
                     to_user.flush();
                  }
               }
               catch(IOException e)
               {
                  to_user.println(e);
               }

               to_user.println("Connection closed by server");
               to_user.flush();
               System.exit(0);
            }
         };

         t.setPriority(Thread.currentThread().getPriority() + 1);
         t.start();

         String line;
         while ((line = from_user.readLine()) != null)
         {
            to_server.println(line);
            to_server.flush();
         }

         //t.stop();
         s.close();
         to_user.println("Connection closed by client");
         to_user.flush();
      }
      catch(Throwable e)
      {
         e.printStackTrace();
         System.err.println("Usage : java TCPClient  ");
      }
   }