Frank Assignment 2

assignments/src/MV3500Cohort2021JulySeptember/homework2/Frank/FrankServer.java

+package MV3500Cohort2021JulySeptember.homework2.Frank;
+
+import java.io.*;
+import java.net.*;
+
+
+public class FrankServer {
+
+    /**
+     * Program invocation, execution starts here If already compiled, can run
+     * using console in directory ../../build/classes/ by invoking \ java
+     * -classpath .TcpExamples.TcpExample3Server
+     *
+     * @param args command-line arguments
+     * @throws java.lang.InterruptedException
+     */
+    public static void main(String[] args) throws InterruptedException {
+        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(FrankServer.class.getName() + " has started..."); // it helps debugging to put this on console first
+
+            ServerSocket serverSocket = new ServerSocket(2318); // changed from 2317 to 2318
+            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);
+                    if (serverLoopCount <= 10) { // checking if the loop count <= 10
+                        ps.println("How are you doing?"); // this gets sent back to client!
+                    } else {
+                        ps.println("this is good bye message from Franks server"); // termination after 20 messages
+                        break; // Stop server
+                    }
+                    // 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(FrankServer.class.getName() + " 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");
+                    }
+
+                    // Not/*i*/ce 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 " + FrankServer.class.getName() + " 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!");
+            }
+        }
+    }
+}