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


/**
 * This program opens a connection to a computer specified
 * as the first command-line argument.  The connection is made to
 * the port specified by LISTENING_PORT.  The program reads one
 * line of text from the connection and then closes the
 * connection.  It displays the text that it read on
 * standard output.  This program is meant to be used with
 * the server program, DataServer, which sends the current
 * date and time on the computer where the server is running.
 */

public class DateClient {

   public static final int LISTENING_PORT = 32007;

   public static void main(String[] args) {

      String hostName;         // Name of the server computer to connect to.
      Socket connection;       // A socket for communicating with server.
      BufferedReader incoming; // For reading data from the connection.

      /* Get computer name from command line. */

      if (args.length > 0)
         hostName = args[0];
      else {
            // No computer name was given.  Print a message and exit.
         System.out.println("Usage:  java DateClient <server_host_name>");
         return;
      }

      /* Make the connection, then read and display a line of text. */

      try {
         connection = new Socket( hostName, LISTENING_PORT );
         incoming = new BufferedReader( 
                    new InputStreamReader(connection.getInputStream()) );
         String lineFromServer = incoming.readLine();
         if (lineFromServer == null) {
               // A null from incoming.readLine() indicates that
               // end-of-stream was encountered.
            throw new IOException("Connection was opened, " + 
                  "but server did not send any data.");
         }
         System.out.println();
         System.out.println(lineFromServer);
         System.out.println();
         incoming.close();
      }
      catch (Exception e) {
         System.out.println("Error:  " + e);
      }

   }  // end main()


} //end class DateClient