diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Client.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Allen/AllenTcpExample3Client.java
similarity index 98%
rename from assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Client.java
rename to assignments/src/MV3500Cohort2021JulySeptember/homework2/Allen/AllenTcpExample3Client.java
index 2184a1be395895c4fc9da11d10e3129698c901b7..bc3278ae27d7fe39f0eefa7dcc0857718ea6e0e1 100644
--- a/assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Client.java
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Allen/AllenTcpExample3Client.java
@@ -1,4 +1,4 @@
-package MV3500Cohort2021JulySeptember.homework2;
+package MV3500Cohort2021JulySeptember.homework2.Allen;
import java.io.*;
import java.net.*;
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Server.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Allen/AllenTcpExample3Server.java
similarity index 98%
rename from assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Server.java
rename to assignments/src/MV3500Cohort2021JulySeptember/homework2/Allen/AllenTcpExample3Server.java
index 3f4344fe53b26d963cc9bfd6564bb773160ba5a4..ab3fbee545e16d06ff32b8c629b076ffaaa3e91e 100644
--- a/assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Server.java
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Allen/AllenTcpExample3Server.java
@@ -1,4 +1,4 @@
-package MV3500Cohort2021JulySeptember.homework2;
+package MV3500Cohort2021JulySeptember.homework2.Allen;
import java.io.*;
import java.net.*;
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankTcpExample3Client.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Domonique/HittnerDTcpExample3Client.java
similarity index 54%
rename from assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankTcpExample3Client.java
rename to assignments/src/MV3500Cohort2021JulySeptember/homework2/Domonique/HittnerDTcpExample3Client.java
index 59842415433cd6df81d943477b2c6af87b316d61..fcfe2b131702176adf08e604b2b7e646320275be 100644
--- a/assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankTcpExample3Client.java
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Domonique/HittnerDTcpExample3Client.java
@@ -1,35 +1,26 @@
-package MV3500Cohort2021JulySeptember.homework2;
+package MV3500Cohort2021JulySeptember.homework2.Domonique;
+import java.io.*;
+import java.net.*;
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.Reader;
-import java.net.Socket;
-
-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
/**
- *
- * @author justi
+ * Hey why not say what this thing does...
+ * @author Dom Hittner
*/
-public class FrankTcpExample3Client {
+public class HittnerDTcpExample3Client {
- /**
+ /** IPv6 String constant for localhost address, similarly IPv4 127.0.0.1
+ * @see <a href="https://en.wikipedia.org/wiki/localhost">https://en.wikipedia.org/wiki/localhost</a>
+ * @see <a href="https://en.wikipedia.org/wiki/IPv6_address">https://en.wikipedia.org/wiki/IPv6_address</a>
*/
public final static String LOCALHOST = "0:0:0:0:0:0:0:1";
/**
* Program invocation, execution starts here
- *
* @param args command-line arguments
- * @throws java.lang.InterruptedException user cancels execution
+ * @throws java.lang.InterruptedException user can cancel execution
*/
public static void main(String[] args) throws InterruptedException {
-
+
// Local variables/fields
Socket socket = null;
InputStream is;
@@ -37,60 +28,60 @@ public class FrankTcpExample3Client {
BufferedReader br;
String serverMessage;
int clientLoopCount = 0;
-
+
try {
- while (true) {
+ while (true)
+ {
clientLoopCount++; // increment at beginning of loop for reliability
- System.out.println( "creating socket...");
+ System.out.println(HittnerDTcpExample3Client.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, 2318); // locohost?
+ socket = new Socket(LOCALHOST, 2317); // locohost?
// Now hook everything up (i.e. set up the streams), Java style:
- is = socket.getInputStream();
+ is = socket.getInputStream();
isr = new InputStreamReader(is);
- br = new BufferedReader(isr);
+ 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("*********************************");
-
- System.out.print( clientLoopCount + ": ");
- System.out.println("Hola!");
+ System.out.println("==================================================");
+
+// System.out.print ("Client loop " + clientLoopCount + ": ");
+ System.out.println("I am hungry");
System.out.println("The message the server sent was: '" + serverMessage + "'");
// socket gets closed, either automatically/silently by this code (or possibly by the server)
- if (serverMessage.equals("this is good bye message from Franks server")) { //if client recieved termanation message stop client
- break;
- }
- Thread.sleep(1000); // turned it down to 1 second
-
+
+ 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 " + FrankTcpExample3Client.class.getName() + " networking:"); // describe what is happening
+ }
+ catch (IOException e)
+ {
+ System.err.println("Problem with " + HittnerDTcpExample3Client.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
+ }
+ finally // occurs after any other activity when shutting down
{
try {
- if (socket != null) {
+ if (socket != null)
socket.close();
- }
- } catch (IOException e) {
- }
-
+ } catch (IOException e) {}
+
// program exit: tell somebody about that happening. Likely cause: server drops connection.
System.out.println();
- System.out.println("Good Bye!!!");
+ System.out.println(HittnerDTcpExample3Client.class.getName() + " exit");
}
}
-}
+}
\ No newline at end of file
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankServer.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Domonique/HittnerDTcpExampleServer.java
similarity index 51%
rename from assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankServer.java
rename to assignments/src/MV3500Cohort2021JulySeptember/homework2/Domonique/HittnerDTcpExampleServer.java
index aafe9a4a2ee3a0126f26a4f906abf699ea2a5864..610a9a7dccb332fb42a068f12ed77f243915cd23 100644
--- a/assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankServer.java
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Domonique/HittnerDTcpExampleServer.java
@@ -1,28 +1,29 @@
-package MV3500Cohort2021JulySeptember.homework2;
+package MV3500Cohort2021JulySeptember.homework2.Domonique;
import java.io.*;
import java.net.*;
-
-public class FrankServer {
+/**
+ *
+ * @author Dom Hittner
+ */
+public class HittnerDTcpExampleServer {
/**
- * Program invocation, execution starts here If already compiled, can run
- * using console in directory ../../build/classes/ by invoking \ java
- * -classpath . TcpExamples.TcpExample3Server
- *
+ * Program invocation, execution starts here
+ * If already compiled, can run using console in directory ../../build/classes/ by invoking \
+ * java -classpath . TcpExamples.TcpExample3Server
* @param args command-line arguments
- * @throws java.lang.InterruptedException user cancels execution
*/
- public static void main(String[] args) throws InterruptedException {
+ 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(FrankServer.class.getName() + " has started..."); // it helps debugging to put this on console first
-
- ServerSocket serverSocket = new ServerSocket(2318); // changed from 2317 to 2318
+ System.out.println(HittnerDTcpExampleServer.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;
@@ -32,45 +33,42 @@ public class FrankServer {
// Server is up and waiting (i.e. "blocked" or paused)
// Loop, infinitely, waiting for client connections.
// Stop the program somewhere else.
- while (true) {
-
+ while (true) {
+
// block until connected to a client
- try ( Socket clientConnectionSocket = serverSocket.accept()) {
+ 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);
- if (serverLoopCount <= 10) { // checking if the loop count <= 10
- ps.println("How are you doing?"); // this gets sent back to client!
- } else {
- ps.println("this is good bye message from Franks server"); // termination after 20 messages
- break; // Stop server
- }
+ ps.println("okay " + serverLoopCount + " let's go to Starbucks"); // 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();
+ localAddress = clientConnectionSocket.getLocalAddress();
remoteAddress = clientConnectionSocket.getInetAddress();
- localPort = clientConnectionSocket.getLocalPort();
- remotePort = clientConnectionSocket.getPort();
-
- System.out.print("Server loop " + serverLoopCount + ": ");
-
+ localPort = clientConnectionSocket.getLocalPort();
+ remotePort = clientConnectionSocket.getPort();
+
+ System.out.print ("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(FrankServer.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(HittnerDTcpExampleServer.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");
- }
-
- // Not/*i*/ce the use of flush() and try w/ resources. Without
+
+ // 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.
@@ -79,7 +77,7 @@ public class FrankServer {
}
}
} catch (IOException e) {
- System.err.println("Problem with " + FrankServer.class.getName() + " networking: " + e);
+ System.err.println("Problem with " + HittnerDTcpExampleServer.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) {
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankClient.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankClient.java
deleted file mode 100644
index 7a47fc9139e04f668c57b2448f8f907fc511b538..0000000000000000000000000000000000000000
--- a/assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankClient.java
+++ /dev/null
@@ -1,99 +0,0 @@
-package MV3500Cohort2021JulySeptember.homework2;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.Reader;
-import java.net.Socket;
-
-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
-/**
- *
- * @author justi
- */
-public class FrankClient {
-
- /**
- */
- public final static String LOCALHOST = "0:0:0:0:0:0:0:1";
-
- /**
- * Program invocation, execution starts here
- *
- * @param args command-line arguments
- * @throws java.lang.InterruptedException user cancels execution
- */
- 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;
-
- try {
- while (true) {
- clientLoopCount++; // increment at beginning of loop for reliability
- System.out.println( "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, 2318); // 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("*********************************");
-
- System.out.print( clientLoopCount + ": ");
- System.out.println("Hola!");
- System.out.println("The message the server sent was: '" + serverMessage + "'");
- int count = 0;
- System.out.println("test");
- count++;
-// socket gets closed, either automatically/silently by this code (or possibly by the server)
- if (serverMessage.equals("this is good bye message from Franks server")) { //if client recieved termanation message stop client
- break;
- }
- Thread.sleep(1000); // turned it down to 1 second
-
- } // end while(true) // infinite loops are dangerous, be sure to kill this process!
- } catch (IOException e) {
- System.err.println("Problem with " + FrankClient.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("Good Bye!!!");
- }
- }
-}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankTcpExample3Server.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankTcpExample3Server.java
deleted file mode 100644
index 037239a06f9d2e3f4f4685f20e94da4afe79178b..0000000000000000000000000000000000000000
--- a/assignments/src/MV3500Cohort2021JulySeptember/homework2/FrankTcpExample3Server.java
+++ /dev/null
@@ -1,90 +0,0 @@
-package MV3500Cohort2021JulySeptember.homework2;
-
-import java.io.*;
-import java.net.*;
-
-
-public class FrankTcpExample3Server {
-
- /**
- * Program invocation, execution starts here If already compiled, can run
- * using console in directory ../../build/classes/ by invoking \ java
- * -classpath . TcpExamples.TcpExample3Server
- *
- * @param args command-line arguments
- * @throws java.lang.InterruptedException user cancels execution
- */
- public static void main(String[] args) throws InterruptedException {
- 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(FrankTcpExample3Server.class.getName() + " has started..."); // it helps debugging to put this on console first
-
- ServerSocket serverSocket = new ServerSocket(2318); // changed from 2317 to 2318
- 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);
- if (serverLoopCount <= 10) { // checking if the loop count <= 10
- ps.println("How are you doing?"); // this gets sent back to client!
- } else {
- ps.println("this is good bye message from Franks server"); // termination after 20 messages
- break; // Stop server
- }
- // 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("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(FrankTcpExample3Server.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");
- }
-
- // Not/*i*/ce 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 " + FrankTcpExample3Server.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!");
- }
- }
- }
-}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerDTcpExample3Client.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerDTcpExample3Client.java
index 8362c3a4632b267e47a6448faadd19c375c619a2..f1119e65369fc79ac7a7e3abd2755fa7f5c50510 100644
--- a/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerDTcpExample3Client.java
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerDTcpExample3Client.java
@@ -3,7 +3,7 @@ import java.io.*;
import java.net.*;
/**
- *
+ * Hey why not say what this thing does...
* @author Dom Hittner
*/
public class HittnerDTcpExample3Client {
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNick/HittnerNickTcpExample3Client.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNick/HittnerNickTcpExample3Client.java
new file mode 100644
index 0000000000000000000000000000000000000000..4490630bf4418b5d0e6ef9d7f6b9f01f9bb2ac8d
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNick/HittnerNickTcpExample3Client.java
@@ -0,0 +1,95 @@
+package MV3500Cohort2021JulySeptember.homework2.HittnerNick;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * Before, we always used telnet (netcat) to connect to the server. Here we are
+ * now writing our own program to do the connection.
+ *
+ * As you will see, when we run this after we start the server we will see the
+ * same string telnet printed, sent by the server. The output at the server will
+ * show different socket pairs for each time the loop iterates.
+ *
+ * @author mcgredo
+ * @author brutzman
+ */
+public class HittnerNickTcpExample3Client {
+
+ /** IPv6 String constant for localhost address, similarly IPv4 127.0.0.1
+ * @see <a href="https://en.wikipedia.org/wiki/localhost">https://en.wikipedia.org/wiki/localhost</a>
+ * @see <a href="https://en.wikipedia.org/wiki/IPv6_address">https://en.wikipedia.org/wiki/IPv6_address</a>
+ */
+ public final static String LOCALHOST = "0:0:0:0:0:0:0:1";
+
+ /**
+ * Program invocation, execution starts here
+ * @param args command-line arguments
+ * @throws java.lang.InterruptedException user can cancel execution
+ */
+ 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;
+
+ try {
+ while (true)
+ {
+ clientLoopCount++; // increment at beginning of loop for reliability
+ System.out.println(HittnerNickTcpExample3Client.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("==================================================");
+
+ System.out.print ("Client loop " + clientLoopCount + ": ");
+ System.out.println("Good morning, Nick");
+ 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 " + HittnerNickTcpExample3Client.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(HittnerNickTcpExample3Client.class.getName() + " exit");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNick/HittnerNickTcpExample3Server.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNick/HittnerNickTcpExample3Server.java
new file mode 100644
index 0000000000000000000000000000000000000000..3c59c1895b02cce7f001010293c059a9d7ee5134
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNick/HittnerNickTcpExample3Server.java
@@ -0,0 +1,103 @@
+package MV3500Cohort2021JulySeptember.homework2.HittnerNick;
+
+ import java.io.*;
+import java.net.*;
+
+/**
+ * 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 mcgredo
+ * @author brutzman
+ */
+public class HittnerNickTcpExample3Server {
+
+ /**
+ * Program invocation, execution starts here
+ * If already compiled, can run using console in directory ../../build/classes/ by invoking \
+ * java -classpath . TcpExamples.TcpExample3Server
+ * @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(HittnerNickTcpExample3Server.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 + " Good morning, Domonique. "); // 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 ("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(HittnerNickTcpExample3Server.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 " + HittnerNickTcpExample3Server.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!");
+ }
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNick/HittnerNickUmlSequenceDiagram.pdf b/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNick/HittnerNickUmlSequenceDiagram.pdf
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index 0000000000000000000000000000000000000000..6d672dc7d7bd638305144ea3e04cc31592246b22
Binary files /dev/null and b/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNick/HittnerNickUmlSequenceDiagram.pdf differ