Assignment 1

assignments/src/MV3500Cohort2024JulySeptember/homework1/Smith/HomeworkClient.java

+package MV3500Cohort2024JulySeptember.homework1.Smith;
+
+import java.io.*;
+import java.net.*;
+import java.util.Scanner;
+
+public class HomeworkClient {
+    public HomeworkClient() {
+        // default constructor
+    }
+
+    public final static String LOCALHOST = "0:0:0:0:0:0:0:1";
+
+    public static void main(String[] args) {        
+        Socket socket = null;
+        InputStream is;
+        Reader isr;
+        BufferedReader br;
+        PrintWriter pw;
+        String serverMessage;
+        int clientLoopCount = 0;
+        
+        Scanner scanner = new Scanner(System.in);
+
+        try {
+            while (true) {
+                clientLoopCount++;
+                System.out.println(HomeworkClient.class.getName() + " creating socket...");
+
+                socket = new Socket(LOCALHOST, 2317);
+
+                System.out.println("Enter a number to send to the server:");
+                int numberToSend = scanner.nextInt();
+
+                // Send the number to the server
+                pw = new PrintWriter(socket.getOutputStream(), true);
+                pw.println(numberToSend);
+
+                is = socket.getInputStream();
+                isr = new InputStreamReader(is);
+                br = new BufferedReader(isr);
+
+                serverMessage = br.readLine();
+                System.out.println("==================================================");
+                       
+                System.out.print("Client loop " + clientLoopCount + ": ");
+                System.out.println("now we're talking!");
+                System.out.println("The message the server sent was: '" + serverMessage + "'");
+                
+                Thread.sleep(500l);
+            }
+        } catch (IOException | InterruptedException e) {
+            System.err.println("Problem with " + HomeworkClient.class.getName() + " networking:");
+            System.err.println("Error: " + e);
+            
+            if (e instanceof java.net.BindException) {
+                System.err.println("*** Be sure to stop any other running instances of programs using this port!");
+            }
+        } finally {
+            try {
+                if (socket != null)
+                    socket.close();
+            } catch (IOException e) {}
+            
+            System.out.println();
+            System.out.println(HomeworkClient.class.getName() + " exit");
+        }
+    }
+}

assignments/src/MV3500Cohort2024JulySeptember/homework1/Smith/HomeworkServer.java

+
+package MV3500Cohort2024JulySeptember.homework1.Smith;
+
+import java.io.*;
+import java.net.*;
+
+public class HomeworkServer {
+    private static int runningTotal = 0; // Initialize running total
+
+    public HomeworkServer() {
+        // default constructor
+    }
+
+    public static void main(String[] args) {
+        try {
+            System.out.println(HomeworkServer.class.getName() + " has started...");
+            ServerSocket serverSocket = new ServerSocket(2317);
+            OutputStream os;
+            PrintStream ps;
+            InetAddress localAddress, remoteAddress;
+            int localPort, remotePort;
+            int serverLoopCount = 0;
+
+            while (true) {
+                try (Socket clientConnectionSocket = serverSocket.accept()) {
+                    serverLoopCount++;
+
+                    os = clientConnectionSocket.getOutputStream();
+                    ps = new PrintStream(os);
+
+                    // Read the number sent by the client
+                    BufferedReader br = new BufferedReader(new InputStreamReader(clientConnectionSocket.getInputStream()));
+                    int clientNumber = Integer.parseInt(br.readLine());
+                    
+                    // Update the running total
+                    int clientNumnerSqr = clientNumber * clientNumber;
+                    runningTotal += clientNumber;
+
+                    // Send back the updated total
+                    ps.println("Client sent: " + clientNumber + ", client number squared was: "+ clientNumnerSqr+", Running total: " + runningTotal);
+                    System.out.println("Client sent: " + clientNumber + ", Running total: " + runningTotal);
+
+                    localAddress = clientConnectionSocket.getLocalAddress();
+                    remoteAddress = clientConnectionSocket.getInetAddress();
+                    localPort = clientConnectionSocket.getLocalPort();
+                    remotePort = clientConnectionSocket.getPort();
+
+                    System.out.print("Server loop " + serverLoopCount + ": ");
+                    System.out.println(HomeworkServer.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");                    
+                    ps.flush();
+                }
+            }
+        } catch (IOException e) {
+            System.err.println("Problem with " + HomeworkServer.class.getName() + " networking: " + e);
+
+            if (e instanceof java.net.BindException) {
+                System.err.println("*** Be sure to stop any other running instances of programs using this port!");
+            }
+        }
+    }
+}
+