Homework 2 - Final

assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java

-package MV3500Cohort2021JulySeptember.homework2.Fisher;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.OutputStream;
-import java.io.PrintStream;
-import java.net.InetAddress;
-import java.net.ServerSocket;
-import java.net.Socket;
-
-/**
- * Very slightly more complex than example1, further modifying example2. The
- * only thing this does differently is introduce a loop into the response, so
- * you don't have to restart the program after one response. Also, it prints out
- * the socket pair the server sees. Run the program via telnet several times and
- * compare the socket pairs.
- *
- * telnet (nc) localhost 2317
- *
- * If you're sophisticated you can contact the instructor's computer while
- * running this program.
- *
- * telnet (nc) [ipNumberOfServerLaptop] 2317
- *
- * and have the instructor display the socket pairs received.
- *
- * @author adfis
- */
-public class FisherServer {
-
-    /**
-     * @param args 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("FisherServer has started..."); // it helps debugging to put this on console first
-
-            ServerSocket serverSocket = new ServerSocket(2317);
-            OutputStream os;
-            PrintStream ps;
-            InetAddress localAddress, remoteAddress;
-            int localPort, remotePort;
-
-            InputStream is;
-            InputStreamReader isr;
-            BufferedReader br;
-            int serverLoopCount = 1;
-
-
-            // Server is up and waiting (i.e. "blocked" or paused)
-            // Loop, infinitely, waiting for client connections.
-            // Stop the program somewhere else.
-            while (serverLoopCount <= 10) {
-
-                // block until connected to a client
-                try ( Socket clientConnectionSocket = serverSocket.accept()) {
-
-                    // Now hook everything up (i.e. set up the streams), Java style:
-                    os = clientConnectionSocket.getOutputStream();
-                    ps = new PrintStream(os);
-                    ps.println("Why did the chicken cross the road?"); // 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();
-
-
-
-                    // 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("FisherServer socket pair showing host name, address, port:");
-                    System.out.println("  (( "
-                            + localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( "
-                            + remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
-
-                    is = clientConnectionSocket.getInputStream();
-                    isr = new InputStreamReader(is);
-                    br = new BufferedReader(isr);
-
-                    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.
-                    serverLoopCount++;
-                    ps.flush();
-                    // like it or not, you're outta here!
-                }
-            }
-        } catch (IOException e) {
-            System.err.println("Problem with FisherServer 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!");
-            }
-        }
-    }
-
-}
+package MV3500Cohort2021JulySeptember.homework2.Fisher;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * Very slightly more complex than example1, further modifying example2. The
+ * only thing this does differently is introduce a loop into the response, so
+ * you don't have to restart the program after one response. Also, it prints out
+ * the socket pair the server sees. Run the program via telnet several times and
+ * compare the socket pairs.
+ *
+ * telnet (nc) localhost 2317
+ *
+ * If you're sophisticated you can contact the instructor's computer while
+ * running this program.
+ *
+ * telnet (nc) [ipNumberOfServerLaptop] 2317
+ *
+ * and have the instructor display the socket pairs received.
+ *
+ * @author adfis
+ */
+public class FisherServer {
+
+    /**
+     * @param args 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("FisherServer has started..."); // it helps debugging to put this on console first
+
+            ServerSocket serverSocket = new ServerSocket(2317);
+            OutputStream os;
+            PrintStream ps;
+            InetAddress localAddress, remoteAddress;
+            int localPort, remotePort;
+
+            InputStream is;
+            InputStreamReader isr;
+            BufferedReader br;
+            int serverLoopCount = 1;
+
+
+            // Server is up and waiting (i.e. "blocked" or paused)
+            // Loop, infinitely, waiting for client connections.
+            // Stop the program somewhere else.
+            // Made a loop counter for server to stop after 10 pings with client
+            while (serverLoopCount <= 10) {
+
+                // block until connected to a client
+                try ( Socket clientConnectionSocket = serverSocket.accept()) {
+
+                    // Now hook everything up (i.e. set up the streams), Java style:
+                    os = clientConnectionSocket.getOutputStream();
+                    ps = new PrintStream(os);
+                    ps.println("Why did the chicken cross the road?"); // 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();
+
+
+
+                    // 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("FisherServer socket pair showing host name, address, port:");
+                    System.out.println("  (( "
+                            + localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( "
+                            + remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+
+                    is = clientConnectionSocket.getInputStream();
+                    isr = new InputStreamReader(is);
+                    br = new BufferedReader(isr);
+
+                    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.
+                    serverLoopCount++;
+                    ps.flush();
+                    // like it or not, you're outta here!
+                }
+            }
+        } catch (IOException e) {
+            System.err.println("Problem with FisherServer 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!");
+            }
+        }
+    }
+
+}