put together Stefan'S and my folder

08/18/2020

assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/TCPReceiverVPNBridge.java

-
-package MV3500Cohort2020JulySeptember.homework3.WeissenbergerGoericke;
-
-import java.io.IOException;
-import java.io.OutputStream;
-import java.io.PrintStream;
-import java.net.InetAddress;
-import java.net.ServerSocket;
-import java.net.Socket;
-
-/**
- * Just for me for testing - not part of Homework #3!
- * @author Loki
- */
-public class TCPReceiverVPNBridge {
-
-    protected static String server_IP_VPN = "10.1.105.9"; // argon IP
-    protected static String server_IP_Local = "192.168.188.103"; // Local IP
-    
-    private static final int server_Port = 2317 ;
-    protected static String client_IP ;
-    
-    /**
-     * @param args the command line arguments
-     */
-    public static void main(String[] args) {
-        try {
-            
-            
-
-// ServerSocket waits for a connection from a client. 
-            // Notice that it is outside the loop; ServerSocket
-            // needs to be made only once.
-            System.out.println("TcpExample3Server has started..."); // it helps debugging to put this on console first
-            
-            ServerSocket serverSocket = new ServerSocket(server_Port);
-            OutputStream os;
-            PrintStream ps;
-            InetAddress localAddress, remoteAddress;
-            int localPort, remotePort;
-            int serverLoopCount = 0;
-
-            // Server is up and waiting (i.e. "blocked" or paused)
-            // Loop, infinitely, waiting for client connections.
-            // Stop the program somewhere else.
-            while (true) { 
-                
-                // block until connected to a client
-                try (Socket clientConnectionSocket = serverSocket.accept())
-                {
-                    serverLoopCount++; // increment at beginning of loop for reliability
-                    
-                    // Now hook everything up (i.e. set up the streams), Java style:
-                    os = clientConnectionSocket.getOutputStream();
-                    ps = new PrintStream(os);
-                    ps.println("This is response " + serverLoopCount + " produced by the server."); // this gets sent back to client!
-                    
-                    // Print some information locally about the Socket connection.
-                    // This includes the port and IP numbers on both sides (the socket pair).
-                     localAddress = clientConnectionSocket.getLocalAddress();
-                    remoteAddress = clientConnectionSocket.getInetAddress();
-                        localPort = clientConnectionSocket.getLocalPort();
-                       remotePort = clientConnectionSocket.getPort();
-                       
-                    System.out.print ("Server loop " + serverLoopCount + ": ");
-                    
-                    // My socket pair connection looks like this, to localhost:
-                    // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 ))
-                    // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
-                    
-                    // Why is the first IP/port the same, while the second set has different ports?
-                    System.out.println("TcpExample3Server socket pair showing host name, address, port:");
-                    System.out.println("  (( " + 
-                         localAddress.getHostName() + "=" +  localAddress.getHostAddress() + ", " + localPort + " ), ( " + 
-                        remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
-                    
-                    if ( localAddress.getHostName().equals( localAddress.getHostAddress()) ||
-                        remoteAddress.getHostName().equals(remoteAddress.getHostAddress()))
-                        System.out.println("  note HostName matches address if host has no DNS name");
-                    
-                    // Notice the use of flush() and try w/ resources. Without
-                    // the try w/ resources the Socket object may stay open for
-                    // a while after the client has stopped needing this
-                    // connection. try w/ resources explicitly ends the connection.
-                    ps.flush();
-                    // like it or not, you're outta here!
-                }
-            }
-        } catch (IOException e) {
-            System.err.println("Problem with TcpExample3Server networking: " + e);
-
-            // Provide more helpful information to user if exception occurs due to running twice at one time
-            if (e instanceof java.net.BindException) {
-                System.err.println("*** Be sure to stop any other running instances of programs using this port!");
-            }
-        }
-    }
-    
-}