OO Programming in Java

Class 10 Material

Network

Java is supposed to be about networking .....

Server side ..

import java.awt.*;
import java.lang.*;
import java.util.*;
import java.net.*;
import java.io.*;

public class View extends Frame{

    public static void main(String args[]){

        ServerSocket theServer = null;
        Socket theSocket = null;

        try {
            theServer = new ServerSocket(200);
            System.out.println ("Server ready");
        }
        catch (IOException e) {
            System.out.println("Server Socket Error - " + e);
        }

        while(true) {
            try {
                theSocket = theServer.accept();
                PrintStream p = new PrintStream(theSocket.getOutputStream());
                p.println("You are talking to the Java Server");
                theSocket.close();
            }
            catch (IOException e) {
                System.out.println("Serving Error");
            }
        }
    }
}

Client side ...

import java.awt.*;
import java.lang.*;
import java.util.*;
import java.net.*;
import java.io.*;

public class View extends Frame{

    /* This is the companion to servertest.prj
       This is the client, servertest is the server
                                                    */

    public static void main(String args[]){

        InetAddress address = null;
        Socket theSocket = null;
        DataInputStream theInput = null;

        System.out.println ("Begin Socket Test, Godzilla/Trex");

        try {
            address = InetAddress.getByName("Trex");
            System.out.println("Found address = " + address);
        }
        catch (UnknownHostException e) {
            System.out.println("Could not find address = " + address);
        }

        try {
            theSocket = new Socket(address, 200);
            theInput = new DataInputStream (theSocket.getInputStream());
            String theLine = theInput.readLine();
            System.out.println("Received - " + theLine);
        }
        catch (IOException e) {
            System.out.println("IO Error during communication with server");
        }

        try {Thread.sleep(5000); } catch (InterruptedException e) {}
    }
}