TCPClient.java

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

public class TCPClient {
    public static void main(String[] args) throws IOException {

        // Variables for setting up connection and communication
        Socket Socket = null; // socket to connect with ServerRouter
        PrintWriter out = null; // for writing to ServerRouter
        BufferedReader in = null; // for reading form ServerRouter
        InetAddress addr = InetAddress.getLocalHost();
        String host = addr.getHostAddress(); // Client machine's IP
        String routerName = addr.getHostName(); // ServerRouter host name
        int SockNum = 5555; // port number

        // Tries to connect to the ServerRouter
        try {
            Socket = new Socket(routerName, SockNum);
            out = new PrintWriter(Socket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(Socket.getInputStream()));
        } catch (UnknownHostException e) {
            System.err.println("Don't know about router: " + routerName);
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for the connection to: " + routerName);
            System.exit(1);
        }

        // Variables for message passing
        Reader reader = new FileReader("file.txt");
        BufferedReader fromFile = new BufferedReader(reader); // reader for the string file
        String fromServer; // messages received from ServerRouter
        String fromUser; // messages sent to ServerRouter
        //Server IP goes here
        //Find this in console output of TCPServerRouter (ServerRouter connected with Client/Server: 127.0.0.1)
        String address = "127.0.0.1"; // destination IP (Server)
        long t0, t1, t;

        // Communication process (initial sends/receives
        out.println(address);// initial send (IP of the destination Server)
        fromServer = in.readLine();//initial receive from router (verification of connection)
        System.out.println("ServerRouter: " + fromServer);
        out.println(host); // Client sends the IP of its machine as initial send
        t0 = System.currentTimeMillis();
        long tOriginal = t0;

        int count = 0;

        // Communication while loop
        while ((fromServer = in.readLine()) != null) {
            System.out.println("Server: " + fromServer);
            t1 = System.currentTimeMillis();
            if (fromServer.equals("Bye.")) // exit statement
                break;
            t = t1 - t0;

            //If this is the first run, display the lookup time
            if (count == 0) {
                System.out.println("Lookup time is: " + t*10e-3);
            } else {
                //Otherwise output cycle time per line
                System.out.println("Cycle time: " + t*10e-3);
            }
            count++;

            fromUser = fromFile.readLine(); // reading strings from a file
            if (fromUser != null) {
                System.out.println("Client: " + fromUser);
                out.println(fromUser); // sending the strings to the Server via ServerRouter
                t0 = System.currentTimeMillis();
            }
            long t2 = System.currentTimeMillis();
            //Total time so far, in nanoseconds
            System.out.println("Total time so far: " + (t2 - tOriginal)*10e-3);
        }

        // closing connections
        out.close();
        in.close();
        Socket.close();
    }
}