Merge origin/master

deliverables/src/MV3500Cohort2018JulySeptember/homework2/CainTcpClient.java

+package MV3500Cohort2018JulySeptember.homework2;
+
+import java.net.Socket;
+import java.io.*;
+import java.net.*;
+
+/**
+ * credit to author mcgredo
+ */
+public class CainTcpClient {
+
+    public final static String LOCALHOST = "0:0:0:0:0:0:0:1"; // String constant, i.e. 127.0.0.1
+
+    public static void main(String[] args) {
+        try {
+            while (true) {
+                System.out.println("creating socket");
+
+                // * Changed IP from 2317 to 2468.
+                Socket socket = new Socket(LOCALHOST, 2468); // locohost?
+
+                OutputStream os = socket.getOutputStream();
+                OutputStreamWriter osw = new OutputStreamWriter(os);
+                BufferedWriter bw = new BufferedWriter(osw);
+                
+                InputStream is = socket.getInputStream();
+                InputStreamReader isr = new InputStreamReader(is);
+                BufferedReader br = new BufferedReader(isr);
+                
+                String inputMessage = "Client: We are under attack!  What do we do? ";
+                System.out.println("Client: we told the server: We are under attack!  What do we do? ");
+                String sendMessage = inputMessage + "\n";
+                bw.write(sendMessage);
+                bw.flush();
+
+                String input = br.readLine();
+                System.out.println("Client: copy, server: " + input);
+
+//                String serverMessage = br.readLine();
+                System.out.println("Client: We are on our way!\n" );  // + serverMessage
+
+                String update = br.readLine();
+//           String sendUpdate = update + "\n";
+//           System.out.println("Answer:" + sendUpdate);
+
+            } // end while(true)
+        } catch (IOException e) {
+            System.out.println("Problem with client: "); // describe what is happening
+            System.out.println(e);
+        }
+        // program exit: tell somebody about that
+        System.out.println("client exit");
+    }
+
+}

deliverables/src/MV3500Cohort2018JulySeptember/homework2/CainTcpServer.java

+package MV3500Cohort2018JulySeptember.homework2;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * 
+ * telnet localhost 2468
+ * telnet <ipOfServersLaptop> 2468
+ * credit to author mcgredo
+ */
+public class CainTcpServer 
+{
+
+    public static void main(String[] args) 
+    {
+        try
+        {
+            // * Changed IP from 2317 to 2468.
+            ServerSocket serverSocket = new ServerSocket(2468);
+
+           int x = 1;
+            while(x<=10)
+            {
+                System.out.println("server here, starting loop #: " + x);
+                Socket clientConnection = serverSocket.accept(); // block until connected
+                InputStream is = clientConnection.getInputStream();
+                InputStreamReader isr = new InputStreamReader(is);
+                BufferedReader br = new BufferedReader(isr);
+                String receivedInput = br.readLine();
+                System.out.println("Server: the client said: \n" + receivedInput);
+                
+                String returnInput;
+                returnInput = "Get to the choppa!";   // shows up 
+                System.out.println("Server: told the client to Get to the choppa!\n");                
+                OutputStream os = clientConnection.getOutputStream();
+                OutputStreamWriter osw = new OutputStreamWriter(os);
+                BufferedWriter bw = new BufferedWriter(osw);
+                
+//                bw.write(returnInput);
+//                System.out.println("Message volley");
+                
+                PrintStream ps = new PrintStream(os);                
+                ps.println("Get to the choppa!");
+                ps.println(returnInput);
+                
+                InetAddress localAddress = clientConnection.getLocalAddress();
+                InetAddress remoteAddress = clientConnection.getInetAddress();
+                
+                int localPort = clientConnection.getLocalPort();
+                int remotePort = clientConnection.getPort();
+
+                System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " + 
+                        remoteAddress.toString() + ", " + remotePort + " ))");
+                
+                // Notice the use of flush() and close(). Without
+                // the close() to Socket object may stay open for 
+                // a while after the client has stopped needing this
+                // connection. Close() explicitly ends the connection.
+                ps.flush();
+                clientConnection.close();
+                x++;
+            }
+       }
+        catch(Exception e)
+        {
+            // cosmetic change to print line
+            System.out.println("You got problems!  Deal with it");
+        }
+       
+    }
+    
+}
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