Chris Garibay - Assignment 2

assignments/src/MV3500Cohort2020JulySeptember/homework2/Garibay/GaribayClient.java

+package MV3500Cohort2020JulySeptember.homework2.Garibay;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.net.Socket;
+
+/**
+ *
+ * @author chris
+ */
+public class GaribayClient {
+    // 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";
+
+    public static void main(String[] args) {
+
+        // Local vars/fields
+        Socket socket;
+        InputStream is;
+        InputStreamReader isr;
+        BufferedReader br;
+        String serverMessage;
+
+        try {
+            while (true) {
+
+                //Added a joke to begin with 
+                System.out.println("Where do teeth like to shop?");
+
+                // 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("==================================================");
+                //changed the connecting lingo
+
+                System.out.println("The message the server sent was: '" + serverMessage + "'");
+                
+                //If the server predicts the correct answer, the client will
+                //say he is correct and break from the loop. Ultimately ending
+                //the connection.
+                if (serverMessage.contentEquals("The Gap")) {
+                    System.out.println("Correct!");
+                    break;
+                } else {
+                    System.out.println("Nope! Try again.");
+                }
+
+                // 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 TcpExample3ServerClient 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 {
+
+            // program exit: tell somebody about that
+            System.out.println("\nclient exit");
+        }
+    }
+}

assignments/src/MV3500Cohort2020JulySeptember/homework2/Garibay/GaribayServer.java

+package MV3500Cohort2020JulySeptember.homework2.Garibay;
+
+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;
+
+/**
+ *
+ * @author chris
+ */
+public class GaribayServer {
+    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.
+            
+
+            ServerSocket serverSocket = new ServerSocket(2317);
+            OutputStream os;
+            PrintStream ps;
+            InetAddress localAddress, remoteAddress;
+            int localPort, remotePort;
+
+            // Server is up and waiting (i.e. "blocked" or paused)
+            // Loop, infinitely, waiting for client connections.
+            // Stop the program somewhere else.
+            //initialize the messageToClient
+            String messageToClient = "Thomas' house";
+            
+            //Want the server to provide several answers to the question
+            //To keep the while loop, I just initialized a variable as a global
+            //to change as the code executes. 
+            int i = 0;
+            
+        //Added a length for the while loop dependent on the value of i. 
+        while (i<4) {
+
+            // block until connected to a client
+            try (Socket clientConnection = serverSocket.accept()) {
+
+                // Now hook everything up (i.e. set up the streams), Java style:
+                os = clientConnection.getOutputStream();
+                ps = new PrintStream(os);
+                //changed what the server says to the client in response
+                ps.println(messageToClient);
+
+                // Print some information locally about the Socket connection.
+                // This includes the port and IP numbers on both sides (the socket pair).
+                localAddress = clientConnection.getLocalAddress();
+                remoteAddress = clientConnection.getInetAddress();
+                localPort = clientConnection.getLocalPort();
+                remotePort = clientConnection.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("TcpExample3Server socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( "
+                        + remoteAddress.toString() + ", " + remotePort + " ))");
+                
+                //Provides different answers to the client
+                if (i == 0) {
+                    messageToClient = "American Eagle";
+                }
+                if (i == 1) {
+                    messageToClient = "At Urban Outfitters";
+                }
+                if (i == 2) {
+                    messageToClient = "The Gap";
+                }
+                //Iterates i to change the answers provided.
+                i += 1;
+
+                // 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 TcpExample3Server 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!");
+        }
+    }
+}
+}