// Copyright © 2002
// John M. Thompson
// Boulder, Colorado  USA
// jt@iwaypublishing.com
// http://www.iwaypublishing.com
// 
// A limited right to copy this page for 
// individual (non-commercial) educational 
// use only is hereby granted. 

import java.net.ServerSocket;
import java.net.Socket;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;

public class server
{
   
   public static final int PORT = 1789;
   
   public static final String greeting = "Hello, Client.  Nice to meet you!";

   /**
    * Run server first, then in separate cmd shell, run client.
    * <p>
    * Usage (Windows): > java -classpath . server
    *
    * @param args Array of parameters passed to the application
    * via the command line.
    */
   public static void main( String[] args )
      throws IOException, InterruptedException
   {
      // Create a server socket to listen for connections
      java.net.ServerSocket server = new ServerSocket( PORT );
      
      System.out.println( "Server awaiting connection -\n" );
      // Blocks until client request, then creates new
      // socket on which to conduct client conversation.
      java.net.Socket client = server.accept();
      
      System.out.println( "Server received connection.\n" );
      
      java.io.InputStream  in  = client.getInputStream();
      java.io.OutputStream out = client.getOutputStream();

      byte[] inputStringBytes = new byte[ 256 ];
      int inputLen = in.read( inputStringBytes );
      
      System.out.println( "Server received: " + 
         new String( inputStringBytes, 0, inputLen ) + "\n" );
      
      System.out.println( "Server sending: " + greeting + "\n" );

      out.write( greeting.getBytes() );
      out.flush();
      
      in.close();
      out.close();
      client.close();
      server.close();
      
      System.out.println( "\nServer done." );
      
      System.out.println( "Press <CR>" );
      byte[] response = new byte[256];
      System.in.read( response );      
      
   }
}