Add basic Client and server credentials

serverCredentials.txt

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+user: 9
+password: 919747
+
+user: 10
+password:183220

src/RmCheckersClient.java

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+// RmCheckersClient.java is a client that interacts with Sam, a checkers
+// server. It is designed to illustrate how to communicate with the server
+// in a minimal way.  It is not meant to be beautiful java code.
+// Given the correct machine name and port for the server, a user id, and a
+// password (_machine, _port, _user, and _password in the code), running
+// this program will initiate connection and start a game with the default
+// player. (the _machine and _port values used should be correct, but check
+// the protocol document.)
+//
+// the program has been tested and used under Java 5.0, and 6.0, but probably
+// would work under older or newer versions. (also works under Java 8).
+//
+// Copyright (C) 2008 Robert McCartney
+
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA
+
+import java.io.*;
+import java.net.*;
+
+public class RmCheckersClient {
+
+  protected final static String _user1 = "9";
+  protected final static String _password1 = "919747";
+  protected final static String _user2 = "10";
+  protected final static String _password2 = "183220";
+  protected final static String _opponent = "0";
+  protected final String _machine  = "icarus.engr.uconn.edu";
+  protected int _port = 3499;
+  protected Socket _socket = null;
+  protected PrintWriter _out = null;
+  protected BufferedReader _in = null;
+
+  protected String _gameID;
+  protected String _myColor;
+
+  public RmCheckersClient(){
+    _socket = openSocket();
+  }
+
+  public Socket getSocket(){
+    return _socket;
+  }
+
+  public PrintWriter getOut(){
+    return _out;
+  }
+
+  public BufferedReader getIn(){
+    return _in;
+  }
+
+  public void setGameID(String id){
+    _gameID = id;
+  }
+
+  public String getGameID() {
+    return _gameID;
+  }
+
+  public void setColor(String color){
+    _myColor = color;
+  }
+
+  public String getColor() {
+    return _myColor;
+  }
+
+  public static void main(String[] argv){
+    String readMessage;
+    RmCheckersClient myClient = new RmCheckersClient();
+
+    try{
+      myClient.readAndEcho(); // start message
+      myClient.readAndEcho(); // ID query
+      myClient.writeMessageAndEcho(_user1); // user ID
+
+      myClient.readAndEcho(); // password query
+      myClient.writeMessage(_password1);  // password
+
+      myClient.readAndEcho(); // opponent query
+      myClient.writeMessageAndEcho(_opponent);  // opponent
+
+      myClient.setGameID(myClient.readAndEcho().substring(5,10)); // game
+      myClient.setColor(myClient.readAndEcho().substring(6,11));  // color
+      System.out.println("I am playing as "+myClient.getColor()+ " in game number "+ myClient.getGameID());
+      readMessage = myClient.readAndEcho();
+      // depends on color--a black move if i am white, Move:Black:i:j
+      // otherwise a query to move, ?Move(time):
+      if (myClient.getColor().equals("White")) {
+        readMessage = myClient.readAndEcho();  // move query
+        myClient.writeMessageAndEcho("(2:4):(3:5)");
+        readMessage = myClient.readAndEcho();  // white move
+        readMessage = myClient.readAndEcho();  // black move
+        readMessage = myClient.readAndEcho();  // move query
+        // here you would need to move again
+      }
+      else {
+        myClient.writeMessageAndEcho("(5:3):(4:4)");
+        readMessage = myClient.readAndEcho();  // black move
+        readMessage = myClient.readAndEcho();  // white move
+        readMessage = myClient.readAndEcho();  // move query
+        // here you would need to move again
+      }
+
+      myClient.getSocket().close();
+    } catch  (IOException e) {
+      System.out.println("Failed in read/close");
+      System.exit(1);
+    }
+  }
+
+  public String readAndEcho() throws IOException
+  {
+    String readMessage = _in.readLine();
+    System.out.println("read: "+readMessage);
+    return readMessage;
+  }
+
+  public void writeMessage(String message) throws IOException
+  {
+    _out.print(message+"\r\n");
+    _out.flush();
+  }
+
+  public void writeMessageAndEcho(String message) throws IOException
+  {
+    _out.print(message+"\r\n");
+    _out.flush();
+    System.out.println("sent: "+ message);
+  }
+
+  public  Socket openSocket(){
+    //Create socket connection, adapted from Sun example
+    try{
+      _socket = new Socket(_machine, _port);
+      _out = new PrintWriter(_socket.getOutputStream(), true);
+      _in = new BufferedReader(new InputStreamReader(_socket.getInputStream()));
+    } catch (UnknownHostException e) {
+      System.out.println("Unknown host: " + _machine);
+      System.exit(1);
+    } catch  (IOException e) {
+      System.out.println("No I/O");
+      System.exit(1);
+    }
+    return _socket;
+  }
+}