/** File is: MyTelnetClient.java
2017-10-02, Clark Elliott
This is a quick and dirty reworking of the Inet program. Feel free to use and modify this code as you wish.
Simple mechanism for sending data to a webserver and retrieving the results.
To use:
> java MyTelnetClient condor.depaul.edu
GET /elliott/dog.txt HTTP/1.1 [<-- Type this into the console window manually]
Host: condor.depaul.edu:80
[crlf] [<-- that is, a blank line]
[crlf]
stop
Should return something like:
HTTP/1.1 200 OK
Date: Mon, 02 Oct 2017 20:26:44 GMT
Server: Apache/2.2.3 (Red Hat)
Last-Modified: Wed, 07 Oct 2015 20:29:55 GMT
ETag: "8a1bfc-30-521899bff76c0"
Accept-Ranges: bytes
Content-Length: 48
Content-Type: text/plain
Connection: close
This is Elliott's dog file on condor. Good job!
But you might also get an error message (which is also valid HTML). For example, when a browser is
redirected to https:// protocol (which this simple telnet client can't handle) you'll get something like:
HTTP/1.1 301 Moved Permanently
Date: Tue, 07 Jul 2020 21:13:25 GMT
Server: Apache
Location: https://condor.depaul.edu:80/elliott/dog.txt
Content-Length: 252
Content-Type: text/html; charset=iso-8859-1
301 Moved Permanently
Moved Permanently
The document has moved here.
Or some other kind of HTML-formatted error. Either kind of response is fine. You are still talking to the server.
----------------------------------------------------------------------*/
import java.io.*;
import java.net.*;
public class MyTelnetClient{
public static void main (String args[]) {
String serverName;
if (args.length < 1) serverName = "localhost";
else serverName = args[0];
Socket sock;
BufferedReader fromServer;
PrintStream toServer;
String textFromServer;
System.out.println("Clark Elliott's MyTelnet Client, 1.0.\n");
System.out.println("Using server: " + serverName + ", Port: 80");
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
try {
sock = new Socket(serverName, 80); // change this to 2540 if you want to talk to MyListener at localhost!
fromServer =
new BufferedReader(new InputStreamReader(sock.getInputStream()));
toServer = new PrintStream(sock.getOutputStream());
String dataToSend;
do {
System.out.print
("Enter text to send to the server, to end: ");
System.out.flush ();
dataToSend = in.readLine ();
if (dataToSend.indexOf("stop") < 0){
toServer.println(dataToSend);
toServer.flush();
}
} while (dataToSend.indexOf("stop") < 0);
for (int i = 1; i <=20; i++){
textFromServer = fromServer.readLine();
if (textFromServer != null) System.out.println(textFromServer);
}
sock.close();
} catch (IOException x) {x.printStackTrace ();}
}
}