From ebacc81fc329b368212ec7ed646682ba80dcd212 Mon Sep 17 00:00:00 2001
From: mrobi <mrobi@192.168.1.69>
Date: Fri, 3 Sep 2021 15:58:41 -0700
Subject: [PATCH] HW2 reupload
---
.../Robinson/RobinsonTCP3exClient.java | 89 +++++++++++++++++++
.../Robinson/RobinsonTCP3exServer.java | 86 ++++++++++++++++++
2 files changed, 175 insertions(+)
create mode 100644 assignments/src/MV3500Cohort2021JulySeptember/homework2/Robinson/RobinsonTCP3exClient.java
create mode 100644 assignments/src/MV3500Cohort2021JulySeptember/homework2/Robinson/RobinsonTCP3exServer.java
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Robinson/RobinsonTCP3exClient.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Robinson/RobinsonTCP3exClient.java
new file mode 100644
index 0000000000..1b3ac0dc4e
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Robinson/RobinsonTCP3exClient.java
@@ -0,0 +1,89 @@
+package MV3500Cohort2021JulySeptember.homework2.Robinson;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.net.Socket;
+
+/**
+ *
+ * @author mrobi
+ */
+public class RobinsonTCP3exClient {
+
+ public final static String LOCALHOST = "0:0:0:0:0:0:0:1";
+
+ /**
+ * Program invocation, execution starts here
+ * @param args command-line arguments
+ */
+ public static void main(String[] args) throws InterruptedException {
+
+ // Local variables/fields
+ Socket socket = null;
+ InputStream is;
+ Reader isr;
+ BufferedReader br;
+ String serverMessage;
+ int clientLoopCount = 0;
+ int totalLoops = 25;
+
+ try {
+ while (clientLoopCount < totalLoops)
+ {
+ clientLoopCount++; // increment at beginning of loop for reliability
+ System.out.println(RobinsonTCP3exClient.class.getName() + " creating socket...");
+
+ // We request an IP to connect to ("localhost") and
+ // port number at that IP (2317). This establishes
+ // a connection to that IP in the form of a Socket
+ // object; the server uses a ServerSocket to wait for
+ // connections.
+ socket = new Socket(LOCALHOST, 2317); // locohost?
+
+ // Now hook everything up (i.e. set up the streams), Java style:
+ is = socket.getInputStream();
+ isr = new InputStreamReader(is);
+ br = new BufferedReader(isr);
+
+ // Read a single line written by the server. We'd
+ // do things a bit differently if there were many lines to be read
+ // from the server instead of one only.
+ serverMessage = br.readLine();
+ System.out.println("====================RobinsonHW2==============================");
+
+ System.out.print ("Client loop " + clientLoopCount + ": ");
+ System.out.println("now we're talking!");
+ System.out.println("The message the server sent was: '" + serverMessage + "'");
+ // socket gets closed, either automatically/silently by this code (or possibly by the server)
+
+ Thread.sleep(500l); // slow things down, for example 500l (long) = 500 msec (1/2 second)
+
+ } // end while(true) // infinite loops are dangerous, be sure to kill this process!
+ }
+ catch (IOException e)
+ {
+ System.err.println("Problem with " + RobinsonTCP3exClient.class.getName() + " 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
+ if (e instanceof java.net.BindException) {
+ System.err.println("*** Be sure to stop any other running instances of programs using this port!");
+ }
+ }
+ finally // occurs after any other activity when shutting down
+ {
+ try {
+ if (socket != null)
+ socket.close();
+ } catch (IOException e) {}
+
+ // program exit: tell somebody about that happening. Likely cause: server drops connection.
+ System.out.println();
+ System.out.println(RobinsonTCP3exClient.class.getName() + " exit");
+ }
+ }
+}
+
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Robinson/RobinsonTCP3exServer.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Robinson/RobinsonTCP3exServer.java
new file mode 100644
index 0000000000..442d862e57
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Robinson/RobinsonTCP3exServer.java
@@ -0,0 +1,86 @@
+package MV3500Cohort2021JulySeptember.homework2.Robinson;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ *
+ * @author mrobi
+ */
+public class RobinsonTCP3exServer {
+
+ 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(RobinsonTCP3exServer.class.getName() + " 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;
+ int serverLoopCount = 0;
+
+ // Server is up and waiting (i.e. "blocked" or paused)
+ // Loop, infinitely, waiting for client connections.
+ // Stop the program somewhere else.
+ while (true) {
+
+ // block until connected to a client
+ try (Socket clientConnectionSocket = serverSocket.accept())
+ {
+ serverLoopCount++; // increment at beginning of loop for reliability
+
+ // Now hook everything up (i.e. set up the streams), Java style:
+ os = clientConnectionSocket.getOutputStream();
+ ps = new PrintStream(os);
+ ps.println("This is response " + serverLoopCount + " produced by the Robinson server."); // 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();
+
+ System.out.print ("Robinson Server loop " + serverLoopCount + ": ");
+
+ // 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(RobinsonTCP3exServer.class.getName() + " socket pair showing host name, address, port:");
+ System.out.println(" (( " +
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( " +
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+
+ 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.
+ ps.flush();
+ // like it or not, you're outta here!
+ }
+ }
+ } catch (IOException e) {
+ System.err.println("Problem with " + RobinsonTCP3exServer.class.getName() + " 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!");
+ }
+ }
+ }
+}
--
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