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deliverables/src/MV3500Cohort2018JulySeptember/homework1/JacksonAssignment1.java

+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package MV3500Cohort2018JulySeptember.homework1;
+
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ *
+ * @author John
+ */
+public class JacksonAssignment1 {
+
+
+    public static void main(String[] args) {
+        try {
+            System.out.println("Hello invoker, this server process is now running"); // reporting for duty
+			
+            int popularityCount = 0; // state
+
+            ServerSocket serverSocket = new ServerSocket(2317); // server decides here what port to listen on.
+            // of interest: often client doesn't care what port it uses locally when connecting to that server port.
+
+            // Loop, infinitely, waiting for client connections.
+            // Stop the program somewhere else.
+            while (true) {
+                Socket clientConnection = serverSocket.accept(); // blocks! then proceeds once a connection is "accept"ed
+                
+                /**
+                 * changed connectionCount to popularityCount
+                 */
+                popularityCount++;
+
+                OutputStream os = clientConnection.getOutputStream();
+                PrintStream ps = new PrintStream(os);
+
+                        ps.println("This client response was written by server JacksonAssignment1"); // to remote client
+                System.out.println("This server response was written by server JacksonAssignment1"); // to server console
+
+                ps.println("You were connection #" + popularityCount + ", by my count");
+
+                // Print some information locally about the Socket
+                // connection. This includes the port and IP numbers
+                // on both sides (the socket pair.)
+                InetAddress localAddress = clientConnection.getLocalAddress();
+                InetAddress remoteAddress = clientConnection.getInetAddress();
+
+                int localPort = clientConnection.getLocalPort();
+                int remotePort = clientConnection.getPort();       // remember the prior question, why are 2 ports different?
+
+                // 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 )) note IPv6
+                // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+                System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( "
+                        + remoteAddress.toString() + ", " + remotePort + " ))");
+                
+                if (popularityCount == 1){
+                
+                    System.out.println("Your server has received " + popularityCount + " hit"); // report progress
+                }
+                else {
+                    System.out.println("Your server has received " + popularityCount + " hits"); // report progress
+                }
+                ps.flush();
+                clientConnection.close();
+            }
+        } catch (Exception e) {
+            /**
+             * added to the println for fun
+             */
+            System.out.println("Error code: " + e);
+        }
+    }
+}
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