From c52a2a884eef3108ec44dd3a645251e202554ef5 Mon Sep 17 00:00:00 2001
From: "Fisher, Alexander (Alex) (Capt)" <alexander.fisher@nps.edu>
Date: Wed, 28 Jul 2021 23:08:18 +0000
Subject: [PATCH] Fisher Homework 1
---
.../homework1/FisherTCPExample1Telnet.java | 64 +++++++++++++++++++
1 file changed, 64 insertions(+)
create mode 100644 assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java b/assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java
new file mode 100644
index 0000000000..483b40bf6e
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java
@@ -0,0 +1,64 @@
+package MV3500Cohort2021JulySeptember.homework1;
+
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ *
+ * @author adfis
+ */
+
+
+public class FisherTCPExample1Telnet {
+ public static void main(String[] args)
+ {
+ try
+ {
+ System.out.println("TcpExample1Telnet has started and is waiting for a connection.");
+ System.out.println(" help: https://savage.nps.edu/Savage/developers.html#telnet");
+ System.out.println(" enter (telnet localhost 2317) or (nc localhost 2317)..." );
+
+ // The ServerSocket waits for a connection from a client.
+ // It returns a Socket object when the connection occurs.
+ ServerSocket serverSocket = new ServerSocket(2317);
+
+ // Use Java io classes to write text (as opposed to
+ // unknown bytes of some sort) to the client
+
+ // The Socket object represents the connection between
+ // the server and client, including a full duplex connection
+ try (Socket clientConnection = serverSocket.accept()) {
+ // Use Java io classes to write text (as opposed to
+ // unknown bytes of some sort) to the client
+ OutputStream os = clientConnection.getOutputStream();
+ PrintStream ps = new PrintStream(os);
+
+ ps.println("Client response was written by Alex' server TcpExample1."); // to remote clientnc
+ ps.println("We are crushing this assignment, good work.");
+ System.out.println("Server response was written by Alex' server TcpExample1."); // to server console
+ System.out.println("SUCCESS!");
+
+ // "flush()" in important in that it forces a write
+ // across what is in fact a slow connection
+ ps.flush();
+ }
+ System.out.println("TcpExample1 completed successfully.");
+ }
+ catch(IOException e)
+ {
+ System.err.println("Problem with TcpExample1Telnet networking:"); // describe what is happening
+ System.err.println("Error: " + e);
+ // Provide more helpful information to user if exception occurs due to running twice at one time
+
+ // brute force exception checking, can be brittle if exception message changes
+ // if (e.getMessage().equals("Address already in use: NET_Bind"))
+ if (e instanceof java.net.BindException)
+ System.err.println("*** Be sure to stop any other running instances of programs using this port!");
+ }
+ }
+}
+
--
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