diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNickTcpExample3Server.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNickTcpExample3Server.java deleted file mode 100644 index 1739a997b408eb424ac6301e3c3a1219b7d03636..0000000000000000000000000000000000000000 --- a/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNickTcpExample3Server.java +++ /dev/null @@ -1,103 +0,0 @@ -package MV3500Cohort2021JulySeptember.homework2; - - import java.io.*; -import java.net.*; - -/** - * 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 mcgredo - * @author brutzman - */ -public class HittnerNickTcpExample3Server { - - /** - * Program invocation, execution starts here - * If already compiled, can run using console in directory ../../build/classes/ by invoking \ - * java -classpath . TcpExamples.TcpExample3Server - * @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(HittnerNickTcpExample3Server.class.getName() + " 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; - int serverLoopCount = 0; - - // 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()) - { - serverLoopCount++; // increment at beginning of loop for reliability - - // Now hook everything up (i.e. set up the streams), Java style: - os = clientConnectionSocket.getOutputStream(); - ps = new PrintStream(os); - ps.println("This is response " + serverLoopCount + " Good morning, Domonique. "); // 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(); - - System.out.print ("Server loop " + serverLoopCount + ": "); - - // 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(HittnerNickTcpExample3Server.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"); - - // 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 " + HittnerNickTcpExample3Server.class.getName() + " 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!"); - } - } - } -}