Pages

Sunday, 5 March 2017

Chapter 31 Exercise 8, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

31.8 (Transfer last 100 numbers in an ArrayList) Programming Exercise 24.12
retrieves the last 100 prime numbers from a file PrimeNumbers.dat. Write a
client program that requests the server to send the last 100 prime numbers in
an ArrayList . Name the server program Exercise31_08Server and the client
program Exercise31_08Client. Assume that the numbers of the long type are
stored in PrimeNumbers.dat in binary format.

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.ObjectOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;

public class Exercise08s {

 public static void main(String[] args) throws IOException {
  @SuppressWarnings("resource")
  ServerSocket serverSocket = new ServerSocket(8000);
  while (true) {
   Socket socket = serverSocket.accept(); 
   ObjectOutputStream outputToClient = new ObjectOutputStream(socket.getOutputStream());
   
   DataInputStream input = new DataInputStream(new BufferedInputStream(new FileInputStream("/tmp/PrimeNumbers.dat")));
   int primeNumbers = 100;
   ArrayList<Long> list = new ArrayList<>();
   input.skipBytes(input.available() - 8 * primeNumbers);
   for (int i = 0; i < primeNumbers; i++) {
    list.add(input.readLong());
   }
   input.close();
   
   outputToClient.writeObject(list);
   
  }
 }

}

import java.io.*;
import java.net.Socket;
import java.util.ArrayList;

public class Exercise08c {

 public static void main(String[] args) throws IOException, ClassNotFoundException {
  Socket socket = new Socket("localhost", 8000);
  ObjectInputStream fromServer = new ObjectInputStream(socket.getInputStream());
  @SuppressWarnings("unchecked")
  ArrayList<Long> list = (ArrayList<Long>)fromServer.readObject();
  for (int i = 0; i < list.size(); i++) {
   System.out.println(list.get(i));
  }
  socket.close();
 }
}

No comments :

Post a Comment