import java.net.Socket;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.BufferedReader;

import java.io.IOException;

public class EchoClient{

public static void main(String[] args){

if(args.length!=1){

System.err.println("usage: java EchoClient message");

System.err.println("example: java EchoClient I love New York");

return;

}

String message = args[0];

System.out.println("Sending message...");

Socket socket = null;

try{

socket = new Socket("localhost", EchoServer.ECHO_SERVER_PORT);

// explore the ports.

System.out.println("LocalPort: " + socket.getLocalPort() + ", RemotePort: " + socket.getPort());

OutputStream os = socket.getOutputStream();

PrintWriter pw = new PrintWriter(os);

pw.println(message);

pw.flush();

InputStream is = socket.getInputStream();

BufferedReader br = new BufferedReader(new InputStreamReader(is));

String messageBack = br.readLine(); // without line feed.

System.out.println("EchoBack: " + messageBack);

}catch(IOException ioe){

ioe.printStackTrace();

}finally{

if(socket!=null){

try{

socket.close();

}catch(IOException ioe){

ioe.printStackTrace();

}

}

}

}

}