From 4a1a9beb75ae2b6d579b9e4ae1e29795ba0a05ce Mon Sep 17 00:00:00 2001
From: chris <chris@10.0.0.236>
Date: Wed, 22 Jul 2020 11:04:00 -0700
Subject: [PATCH] Cannon HW 1
---
.../homework1/CannonTcpExample1Telnet.java | 61 +++++++++++++++++++
1 file changed, 61 insertions(+)
create mode 100644 assignments/src/MV3500Cohort2020JulySeptember/homework1/CannonTcpExample1Telnet.java
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework1/CannonTcpExample1Telnet.java b/assignments/src/MV3500Cohort2020JulySeptember/homework1/CannonTcpExample1Telnet.java
new file mode 100644
index 0000000000..86eb9df7c3
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework1/CannonTcpExample1Telnet.java
@@ -0,0 +1,61 @@
+package MV3500Cohort2020JulySeptember.homework1;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * Class MV30500
+ * Homework 1 that demonstrates how to connect to a TCP telnet server
+ * @author chris
+ */
+public class CannonTcpExample1Telnet {
+
+ /**
+ * @param args the command line arguments
+ */
+ 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);
+
+ // The Socket object represents the connection between
+ // the server and client, including a full duplex connection
+ 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("This client response was written by Captain Christopher Cannon."); // to remote clientnc
+ System.out.println("This server response was written by Captain Christopher Cannon."); // to server console
+
+
+
+ // "flush()" in important in that it forces a write
+ // across what is in fact a slow connection
+ ps.flush();
+
+ clientConnection.close();
+ System.out.println("TcpExample1 completed successfully.");
+ } catch (IOException e) {
+ System.out.println("problem with networking: " + e);
+
+ // Program modification: provide more helpful information to user if
+ // exception occurs when 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.out.println("Be sure to stop any other running instances of this program!");
+ }
+ }
+ }
+}
--
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