/*  File:  EchoServer.java
 * 
 *  Adapted from an example by
 *  Gary Cornell and Cay S. Horstmann, Core Java (Book/CD-ROM)
 *
 */

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

class EchoServer
{  
   public static void main(String[] args ) 
   {  try 
      {  // open a serversocket on port 4882
         ServerSocket s = new ServerSocket( 4882 );

         // the accept method waits for a message contacting the port
         // from a client
         Socket incoming = s.accept();

         BufferedReader br =
           new BufferedReader(
             new InputStreamReader( incoming.getInputStream() ) );
         PrintWriter out =
           new PrintWriter( incoming.getOutputStream(), true );

         out.println( "Hello! Enter BYE to exit." );

         // Echo lines back to the client until the client sends "BYE"
         boolean done = false;
         while ( !done )
         {  String str = br.readLine();
            if ( str == null ) done = true;
            else
            {  out.println( "Echo: " + str );

               if ( str.trim().equals("BYE") ) 
                  done = true;
            }
         }
         // close the socket         
         incoming.close();
      }
      catch ( Exception e ) 
      {  System.out.println( e );
      } 
   } 
}