diff --git a/examples/src/TcpExamples/Assignment1TCPExample3ClientChange.java b/examples/src/TcpExamples/Assignment1TCPExample3ClientChange.java deleted file mode 100644 index 126c36ca2a5198e092977dc4ce94db2686269774..0000000000000000000000000000000000000000 --- a/examples/src/TcpExamples/Assignment1TCPExample3ClientChange.java +++ /dev/null @@ -1,104 +0,0 @@ -package TcpExamples; - -import java.io.*; -import java.net.*; - -/** - * This is Assignment 1 where I have modified the given code from TCPExample3Client - * -sleep time has been extended to give more time in between loops - * -Initial print line has been altered to reflect assignment 1 - * -Loop only runs a finite number of times ,10. - * Before, we always used telnet (netcat) to connect to the server. Here we are - * now writing our own program to do the connection. - * - * As you will see, when we run this after we start the server we will see the - * same string telnet printed, sent by the server. The output at the server will - * show different socket pairs for each time the loop iterates. - * - * @author mcgredo - * @author brutzman@nps.edu - */ -public class Assignment1TCPExample3ClientChange -{ - /** Default constructor */ - public Assignment1TCPExample3ClientChange() - { - // default constructor - } - /** IPv6 String constant for localhost address, similarly IPv4 127.0.0.1 - * @see <a href="https://en.wikipedia.org/wiki/localhost">https://en.wikipedia.org/wiki/localhost</a> - * @see <a href="https://en.wikipedia.org/wiki/IPv6_address">https://en.wikipedia.org/wiki/IPv6_address</a> - */ - public final static String LOCALHOST = "0:0:0:0:0:0:0:1"; - - /** - * Program invocation, execution starts here - * @param args command-line arguments - */ - public static void main(String[] args) - { - // Local variables/fields - Socket socket = null; - InputStream is; - Reader isr; - BufferedReader br; - String serverMessage; - int clientLoopCount = 0; - int numberOfLoops = 10; - - try { - while (clientLoopCount < numberOfLoops) - { - clientLoopCount++; // increment at beginning of loop for reliability - System.out.println(Assignment1TCPExample3ClientChange.class.getName() + " creating socket..."); - - // 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("======================Assignment1==========================="); - - System.out.print ("Client loop " + clientLoopCount + ": "); - System.out.println("now we're talking!"); - System.out.println("The message the server sent was: '" + serverMessage + "'"); - // socket gets closed, either automatically/silently by this code (or possibly by the server) - - Thread.sleep(800l); // slow things down, for example 500l (long) = 500 msec - - } // end while(true) // infinite loops are dangerous, be sure to kill this process! - } - catch (IOException | InterruptedException e) - { - System.err.println("Problem with " + TcpExample3Client.class.getName() + " 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 // occurs after any other activity when shutting down - { - try { - if (socket != null) - socket.close(); - } catch (IOException e) {} - - // program exit: tell somebody about that happening. Likely cause: server drops connection. - System.out.println(); - System.out.println(TcpExample3Client.class.getName() + " exit"); - } - } -} diff --git a/examples/src/TcpExamples/Assignmnet1TCPExample3ServerChange.java b/examples/src/TcpExamples/Assignmnet1TCPExample3ServerChange.java deleted file mode 100644 index 640121f4e7ed94fbd4da58b22b07a65baff3f741..0000000000000000000000000000000000000000 --- a/examples/src/TcpExamples/Assignmnet1TCPExample3ServerChange.java +++ /dev/null @@ -1,112 +0,0 @@ -package TcpExamples; - -import java.io.*; -import java.net.*; - -/** - * This is Assignment 1 where I have modified the given code from TCPExample3Server - *-server response message changed - * - * 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@nps.edu - */ -public class Assignmnet1TCPExample3ServerChange -{ - /** Default constructor */ - public Assignmnet1TCPExample3ServerChange() - { - // default constructor - } - /** - * 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(Assignmnet1TCPExample3ServerChange.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 + " produced by the server, " - + Assignmnet1TCPExample3ServerChange.class.getName()); // 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(TcpExample3Server.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 " + TcpExample3Server.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!"); - } - } - } -}