OBP 9

package kominikacija;

import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

/**
 * Created by urosrt4515 on 12/18/2018.
 */
public class Klijent {
    public static void main(String[] args) {
        try {
            InetAddress adresa=InetAddress.getByName("127.0.0.1");
            Socket s= new Socket(adresa,7777);
            BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream()));
            PrintWriter out=new PrintWriter(new BufferedWriter(new OutputStreamWriter(s.getOutputStream())),true);

            System.out.println("Klijent pokrenut, unesite zahtev za slanje: ");
            Scanner unos=new Scanner(System.in);
            String zahtev=unos.nextLine();
            out.println(zahtev);
            System.out.println("Klijent poslao zahtev: " + zahtev + ", cekam odgovor servera...");
            String odgovor=in.readLine();
            System.out.println("Odgovor servera: "+odgovor);
            in.close();
            out.close();
            s.close();


        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}



package kominikacija;

import java.io.*;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Created by urosrt4515 on 12/18/2018.
 */
public class ServerNit extends Thread {
    private Socket s;
    private BufferedReader in;
    private PrintWriter out;

    public ServerNit(Socket s) {
        this.s = s;
        try {
            this.in = new BufferedReader(new InputStreamReader(s.getInputStream()));

            this.out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(s.getOutputStream())),true);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void run() {
        try {
        System.out.println("Uspostavljena sesija, cekam zahtev od klijenta...");
        String zahtev = in.readLine();
        String odgovor = "";
        if (zahtev.toUpperCase().equals("VREME")) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy:mm:dd:HH:MM:SS");
            Date d = new Date();
            odgovor = sdf.format(d);

        }
        else
        {
            odgovor = "Server ne moze da razresi trazeni zahtev";
        }
            out.println(odgovor);
            System.out.println("Server primio zahtev"+ zahtev +"salje odgovor:" + odgovor);
            in.close();
            out.close();
            s.close();


    } catch(
    IOException e)

    {
        e.printStackTrace();
    }
 }
}



package kominikacija;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Created by urosrt4515 on 12/18/2018.
 */
public class Server {
    public static void main(String[] args) {
        System.out.println("Server je pokrenut...");
        try {
            ServerSocket ss = new ServerSocket(7777);

            while(true){
                Socket s = ss.accept();
                new ServerNit(s).start();
        }
        }

        catch (IOException e){
                e.printStackTrace();
            }

    }
}