additionclient.java

程序练习中包括书中实例程序代码和练习中要用到的代码,是压缩文件

package examples.network;

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

/** A client-side class that uses a TCP/IP socket
  */
public class AdditionClient {

   private InetAddress host;
   private int port;

   // This is not a reserved port number 
   static final int DEFAULT_PORT = 8189; 

   /** Constructor
     * @param host Internet address of the host
     *        where the server is located
     * @param port Port number on the host where
     *        the server is listening
     */
   public AdditionClient( InetAddress host, int port ) {
      this.host = host;
      this.port = port;
   }

   /** The method used to start a client object
     */
   public void run() {
      try {
         Socket client = new Socket( host, port );
         BufferedReader socketIn;
         socketIn
            = new BufferedReader(
              new InputStreamReader(
              client.getInputStream() ) );
         PrintWriter socketOut
            = new PrintWriter(
              client.getOutputStream(), true );

         String numbers = "1.2 3.4 5.6";
         System.out.println( "Adding the numbers "
                             + numbers
                             + " together" );
         socketOut.println( numbers );
         System.out.println( socketIn.readLine() );

         socketOut.println ( "" );
      }
      catch( IOException iox ) {
         System.out.println( iox );
         iox.printStackTrace();
      }
   }

   /** The test method for the class
     * @param args Optional port number
     *        and host name
     */
   public static void main( String[] args ) {
      try {
         InetAddress host = InetAddress.getLocalHost();
         int port = DEFAULT_PORT;
         if ( args.length > 0 ) {
            port = Integer.parseInt( args[0] );
         }
         if ( args.length > 1 ) {
            host = InetAddress.getByName( args[1] );
         }

         AdditionClient addClient
            = new AdditionClient( host, port );
         addClient.run();
      }
      catch ( UnknownHostException uhx ) {
         System.out.println( uhx );
         uhx.printStackTrace();
      }
   }
}