additionserver.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.*;
import java.util.StringTokenizer;

/** An example class that uses the server socket class
  */
public class AdditionServer {

   private int port;

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

   /** Constructor
     * @param port The port where the server
     *    will listen for requests
     */
   AdditionServer( int port ) {
      this.port = port;
   }

   /** The method that does the work for the class */
   public void run() {
      try {
         ServerSocket ss = new ServerSocket( port );
         Socket incoming = ss.accept();
         BufferedReader in;
         in = new BufferedReader(
            new InputStreamReader(
            incoming.getInputStream() ) );
         PrintWriter out
            = new PrintWriter(
            incoming.getOutputStream(), true );

         String str;
         while ( !(str = in.readLine()).equals("") ) {
            double result = 0;
            StringTokenizer st
               = new StringTokenizer( str );
            try {
               while( st.hasMoreTokens() ) {
                  Double d = new Double( st.nextToken() );
                  result += d.doubleValue();
               }
               out.println( "The result is " + result );
            }
            catch( NumberFormatException nfe ) {
               out.println( "Sorry, your list "
                            + "contains an "
                            + "invalid number" );
            }
         }
         incoming.close();
      }
      catch( IOException iox ) {
         System.out.println( iox );
         iox.printStackTrace();
      }
   }

   /** The test method for the class
     * @param args[0] Optional port number in place of
     *        the default
     */
   public static void main( String[] args ) {
      int port = DEFAULT_PORT;
      if (args.length > 0 ) {
         port = Integer.parseInt( args[0] );
      }
      AdditionServer addServe
         = new AdditionServer( port );
      addServe.run();
   }
}