diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework4/WeissenbergerGoericke/TcpServerForFinal.java b/assignments/src/MV3500Cohort2020JulySeptember/homework4/WeissenbergerGoericke/TcpServerForFinal.java new file mode 100644 index 0000000000000000000000000000000000000000..5e7066c139149084e89bd0cae45237e550476ddf --- /dev/null +++ b/assignments/src/MV3500Cohort2020JulySeptember/homework4/WeissenbergerGoericke/TcpServerForFinal.java @@ -0,0 +1,91 @@ +package MV3500Cohort2020JulySeptember.homework4.Weissenberger; + +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 TcpServerForFinal { + + 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("TcpExample3Server has started..."); // it helps debugging to put this on console first + + //ServerSocket serverSocket = new ServerSocket(2317); + InetAddress[] ia = InetAddress.getAllByName("192.168.188.106"); + for (int i = 0;i < ia.length; i++){ + System.out.println("---: "+ia[i]); + } + ServerSocket serverSocket = new ServerSocket(2317, 100, ia[0]); + + InputStream is; + InputStreamReader isr; + BufferedReader br; + String serverMessage; + + + 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) { + System.out.println("Look for connection...."); + // 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: + is = clientConnectionSocket.getInputStream(); + isr = new InputStreamReader(is); + br = new BufferedReader(isr); + + serverMessage = br.readLine(); + System.out.println("The message the mobile sent was: '" + serverMessage + "'"); + // 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.println ("Server loop " + serverLoopCount + ": "); + + System.out.println("TcpExample3Server socket pair showing host name, address, port:"); + + } + } + } catch (IOException e) { + System.err.println("Problem with TcpExample3Server 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!"); + } + } + } +}