netecho.java

client server using socket programing with best optimized way to do .. and how to do guide is als

// lars appel 25.nov.98 / 22.feb.99 / 25.apr.99

import java.net.*;
import java.io.*;

class NetEcho
{
  // waits for tcp connections, reads a number from the client and returns
  // a response based on this request. use number <= 0 to stop the server.
  
  static final int PORT = 3030;
  
  public static void main( String args[] )
    throws Exception
  {
    ServerSocket serv = new ServerSocket(PORT);

    System.out.println( "NetEcho listener ready" );

    while (true)
    {
      Socket sock = serv.accept();

      BufferedReader r =
        new BufferedReader (new InputStreamReader (sock.getInputStream()) );

      PrintWriter w =
        new PrintWriter (sock.getOutputStream(), false);  // no autoFlush

      int n = Integer.parseInt( r.readLine() );

      System.out.println( "client requested " + n + " lines" );

      if (n <= 0) break;

      w.println ("Sending " + n + " lines...\r");

      for (int k=1; k <= n; k++)
        w.println ("This is test line number " + k + "\r");

      w.println ("Thanks and bye\r");

      w.flush();

      r.close();
      w.close();

      sock.close();
    }

    serv.close();
  }
}