diff --git a/assignments/src/MV3500Cohort2024JulySeptember/homework1/Schnitzler/SchnitzlerUnicastNetworking.java b/assignments/src/MV3500Cohort2024JulySeptember/homework1/Schnitzler/SchnitzlerUnicastNetworking.java new file mode 100644 index 0000000000000000000000000000000000000000..987ab61e24979ba9d0d137fb64722fb6c018a2a8 --- /dev/null +++ b/assignments/src/MV3500Cohort2024JulySeptember/homework1/Schnitzler/SchnitzlerUnicastNetworking.java @@ -0,0 +1,70 @@ +package MV3500Cohort2024JulySeptember.homework1.Schnitzler; + +import java.io.IOException; +import java.io.OutputStream; +import java.io.PrintStream; +import java.net.ServerSocket; +import java.net.Socket; + +/** + * + * @author simonschnitzler + */ +public class SchnitzlerUnicastNetworking { + + /** Default constructor */ + public SchnitzlerUnicastNetworking() + { + // default constructor + } + + /** + * @param args the command line arguments + */ + public static void main(String[] args) { + try + { + System.out.println(SchnitzlerUnicastNetworking.class.getName() + " has started and is waiting for a connection."); + System.out.println(" help: https://savage.nps.edu/Savage/developers.html#telnet"); + System.out.println(" terminal: enter (telnet localhost 2317) or, for macOS (nc localhost 2317)..." ); + + // The ServerSocket waits for a connection from a client. + // It returns a Socket object when the connection occurs. + ServerSocket serverSocket = new ServerSocket(2317); + + // Use Java io classes to write text (as opposed to + // unknown bytes of some sort) to the client + + // The Socket object represents the connection between + // the server and client, including a full duplex connection + try (Socket clientConnection = serverSocket.accept()) // listen, wait here for a client to connect + { + // OK we got something, time to respond! + // Use Java io classes to write text (as opposed to + // unknown bytes of some sort) to the client + OutputStream os = clientConnection.getOutputStream(); + PrintStream ps = new PrintStream(os); + + ps.println("This client response was written by server " + SchnitzlerUnicastNetworking.class.getName()); // to remote client + System.out.println("This server response was written by server " + SchnitzlerUnicastNetworking.class.getName()); // to server console + + // "flush()" in important in that it forces a write + // across what is in fact a slow connection + ps.flush(); + } + System.out.println(SchnitzlerUnicastNetworking.class.getName() + " completed successfully."); + } + catch(IOException ioe) + { + System.err.println("Exception with " + SchnitzlerUnicastNetworking.class.getName() + " networking:"); // describe what is happening + System.err.println(ioe); + // Provide more helpful information to user if exception occurs due to running twice at one time + + // brute force exception checking, can be brittle if exception message changes + // if (e.getMessage().equals("Address already in use: NET_Bind")) + if (ioe 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/MV3500Cohort2024JulySeptember/homework1/Schnitzler/package-info.java b/assignments/src/MV3500Cohort2024JulySeptember/homework1/Schnitzler/package-info.java new file mode 100644 index 0000000000000000000000000000000000000000..e717c85b9d65baf5f904e2429ea9c4af94214489 --- /dev/null +++ b/assignments/src/MV3500Cohort2024JulySeptember/homework1/Schnitzler/package-info.java @@ -0,0 +1,10 @@ +/** + * TCP Unicast homework assignments supporting the NPS MOVES MV3500 Networked Graphics course. + * + * @see <a href="https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/-/tree/master/assignments" target="_blank">networkedGraphicsMV3500 assignments</a> + * @see java.lang.Package + * @see <a href="https://stackoverflow.com/questions/22095487/why-is-package-info-java-useful" target="_blank">StackOverflow: why-is-package-info-java-useful</a> + * @see <a href="https://stackoverflow.com/questions/624422/how-do-i-document-packages-in-java" target="_blank">StackOverflow: how-do-i-document-packages-in-java</a> + */ + +package MV3500Cohort2024JulySeptember.homework1.Schnitzler;