diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework1/BrittTcPExample1Telnet.java b/assignments/src/MV3500Cohort2020JulySeptember/homework1/BrittTcPExample1Telnet.java new file mode 100644 index 0000000000000000000000000000000000000000..7278c7aee899ded4eb187eb4d07067e55d831d26 --- /dev/null +++ b/assignments/src/MV3500Cohort2020JulySeptember/homework1/BrittTcPExample1Telnet.java @@ -0,0 +1,62 @@ + +package MV3500Cohort2020JulySeptember.homework1; + +import java.io.IOException; +import java.io.OutputStream; +import java.io.PrintStream; +import java.net.ServerSocket; +import java.net.Socket; + + +/** + * + * @author Brittokki + */ +public class BrittTcPExample1Telnet { + /** When you run this program, the main method is invoked. + * @param args command-line arguments */ + public static void main(String[] args) + { + try + { + System.out.println("TcpExample1Telnet has started and is waiting for a connection."); + System.out.println(" help: https://savage.nps.edu/Savage/developers.html#telnet"); + System.out.println(" enter (telnet localhost 2317) or (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()) { + // 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 Captain Britt."); + System.out.println("This server response was written by Captain Britt."); + + // "flush()" in important in that it forces a write + // across what is in fact a slow connection + ps.flush(); + } + System.out.println("TcpExample1 completed successfully."); + } + catch(IOException e) + { + System.err.println("Problem with TcpExample1Telnet 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 + + // brute force exception checking, can be brittle if exception message changes + // if (e.getMessage().equals("Address already in use: NET_Bind")) + if (e instanceof java.net.BindException) + System.err.println("*** Be sure to stop any other running instances of programs using this port!"); + } + } +} \ No newline at end of file