// 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.Socket;

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

public class client
{
   /**
    * Run server first, then in separate cmd shell, run client.
    * <p>
    * Usage (Windows): > java -classpath . client 
    *
    * @param args Array of parameters passed to the application
    * via the command line.
    */
   
   public static final int PORT = 1789;
   
   public static final String greeting = "Hello, Server.  This is Client.";
   
   public static void main( String[] args )
      throws IOException, InterruptedException
   {
      System.out.println( "Client attempting connection - \n" );
      
      java.net.Socket client = null;
      try {
         // Connect this client to server on known port
         client = new Socket( "localhost", PORT );
      } catch( Exception e ) {
         System.out.println( "Client connection FAILED.\n" );

         System.out.println( "Press <CR>" );
         byte[] response = new byte[256];
         System.in.read( response );      
      
         return;
      }
      
      System.out.println( "Client connection SUCCEEDED.\n" );
      
      java.io.InputStream  in  = client.getInputStream();
      java.io.OutputStream out = client.getOutputStream();

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

      in.close();
      out.close();
      client.close();
      
      System.out.println( "\nClient done." );
      
      System.out.println( "Press <CR>" );
      byte[] response = new byte[256];
      System.in.read( response );      
      
   }
}