/*
 * Copyright (c) 2004 David Flanagan.  All rights reserved.
 * This code is from the book Java Examples in a Nutshell, 3nd Edition.
 * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
 * You may study, use, and modify it for any non-commercial purpose,
 * including teaching and use in open-source projects.
 * You may distribute it non-commercially as long as you retain this notice.
 * For a commercial use license, or to purchase the book, 
 * please visit http://www.davidflanagan.com/javaexamples3.
 */
package je3.net;
import java.io.*;
import java.net.*;

/**
 * A simple network client that establishes a network connection to a specified
 * port on a specified host, send an optional message across the connection,
 * reads the response from the server and exits.  A suitable client for simple
 * network services like the daytime or finger.
 **/
public class Connect {
    public static void main(String[] args) {
	try {  // Handle exceptions below
	    // Get our command-line arguments
	    String hostname = args[0];
	    int port = Integer.parseInt(args[1]);
	    String message = "";
	    if (args.length > 2) 
		for(int i = 2; i < args.length; i++) message += args[i] + " ";
	    
	    // Create a Socket connected to the specified host and port.
	    Socket s = new Socket(hostname, port);

	    // Get the socket output stream and wrap a PrintWriter around it
	    PrintWriter out = new PrintWriter(s.getOutputStream());

	    // Sent the specified message through the socket to the server.
	    out.print(message + "\r\n");
	    out.flush();  // Send it now.
	    
	    // Get an input stream from the socket and wrap a BufferedReader
	    // around it, so we can read lines of text from the server.
	    BufferedReader in =
		new BufferedReader(new InputStreamReader(s.getInputStream()));

	    // Before we start reading the server's response tell the socket
	    // that we don't want to wait more than 3 seconds
	    s.setSoTimeout(3000);

	    // Now read lines from the server until the server closes the
	    // connection (and we get a null return indicating EOF) or until
	    // the server is silent for 3 seconds.
	    try {
		String line;                          
		while((line = in.readLine()) != null) // If we get a line
		    System.out.println(line);         // print it out.
	    }
	    catch(SocketTimeoutException e) {
		// We end up here if readLine() times out.
		System.err.println("Timeout; no response from server.");
	    }
	    
	    out.close();  // Close the output stream
	    in.close();   // Close the input stream
	    s.close();    // Close the socket
	}
	catch(IOException e) {  // Handle IO and network exceptions here
	    System.err.println(e);
	}
	catch(NumberFormatException e) {  // Bad port number
	    System.err.println("You must specify the port as a number");
	}
	catch(ArrayIndexOutOfBoundsException e) {  // wrong # of args
	    System.err.println("Usage: Connect <hostname> <port> message...");
	}
    }
}