From 8a8f0c6bebe20d309da4ba55631e2cd14b30c259 Mon Sep 17 00:00:00 2001
From: "Fisher, Alexander (Alex) (Capt)" <alexander.fisher@nps.edu>
Date: Wed, 11 Aug 2021 09:55:50 -0700
Subject: [PATCH] Homework 2 - Final
---
.../homework2/Fisher/FisherServer.java | 231 +++++++++---------
1 file changed, 116 insertions(+), 115 deletions(-)
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java
index 181e871821..164e32a072 100644
--- a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java
@@ -1,115 +1,116 @@
-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!");
+ }
+ }
+ }
+
+}
--
GitLab