diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java b/assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java
index d925c7fdc0b4cb83e4cd3eec4a662be1c4b49a09..91f18ffa79d3cd8ba9126bd8e399d3b57b10d304 100644
--- a/assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java
@@ -46,7 +46,7 @@ public class FisherTCPExample1Telnet {
// across what is in fact a slow connection
ps.flush();
}
- System.out.println("TcpExample1 completed successfully.");
+ System.out.println("FisherTCPExample1 completed successfully.");
}
catch(IOException e)
{
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherClient.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherClient.java
new file mode 100644
index 0000000000000000000000000000000000000000..c3d46c8d3cc389f0688a61b070d226fbb66394a5
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherClient.java
@@ -0,0 +1,89 @@
+package MV3500Cohort2021JulySeptember.homework2.Fisher;
+
+//import static MV3500Cohort2020JulySeptember.homework2.White.WhiteClient.LOCALHOST;
+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.Socket;
+
+/**
+ * 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 adfis
+ */
+public class FisherClient {
+
+ // IPv6 String constant for localhost address, similarly IPv4 127.0.0.1
+ 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) {
+
+ // Local variables/fields
+ Socket socket;
+ InputStream is;
+ InputStreamReader isr;
+ BufferedReader br;
+ OutputStream os;
+ PrintStream ps;
+ String serverMessage;
+ int clientLoopCount = 0;
+
+ try {
+ System.out.println("FisherClient creating socket...");
+ while (true) {
+
+ // 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?
+
+ os = socket.getOutputStream();
+ ps = new PrintStream(os);
+
+ // 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.println("The message the server sent was: '" + serverMessage + "'");
+ System.out.println("FisherClient responds with: To get to the other side");
+ // socket gets closed, either automatically/silently by this code (or possibly by the server)
+
+ } // end while(true)
+ } catch (IOException e) {
+ System.err.println("Problem with FisherClient 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
+ {
+ // program exit: tell somebody about that happening. Likely cause: server drops connection.
+ System.out.println();
+ System.out.println("FisherClient exit");
+ }
+ }
+
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java
new file mode 100644
index 0000000000000000000000000000000000000000..82c781df98da0bcf2779f861ca4f12fa07d22ad8
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java
@@ -0,0 +1,113 @@
+package MV3500Cohort2021JulySeptember.homework2.Fisher;
+
+import static com.google.common.base.CharMatcher.is;
+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;
+
+ // 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()) {
+
+ // 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.
+ 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!");
+ }
+ }
+ }
+
+}
diff --git a/examples/src/TcpExamples/TcpExample2ConnectionCounting.java b/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
index 3b99cfa68f3a0fed2c85be70edf23cf7b71843f5..c1b62609c7d5c46014b06f0ce7db5b8f24e36be9 100644
--- a/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
+++ b/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
@@ -36,7 +36,7 @@ public class TcpExample2ConnectionCounting
System.out.println(" Windows ipconfig (or Mac ifconfig) indicates current IPv4_Address (for example local wireless IP address)");
System.out.println(" Windows enter (telnet localhost 2317) or Mac enter (nc localhost 2317) for loopback operation, or" );
System.out.println(" Windows enter (telnet IPv4_Address 2317) or Mac enter (nc IPv4_Address 2317) for LAN operation" );
- System.out.println("TcpExample2ConnectionCounting server standing by..." );
+ System.out.println("TcpExample2ConnectionCounting server standing by..." );
// ServerSocket waits for a connection from a client.
// Notice that it is outside the loop; ServerSocket needs to be made only once.