diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerDTcpExample3Client.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerDTcpExample3Client.java new file mode 100644 index 0000000000000000000000000000000000000000..682a2435132c35f7dae16f287136d11bcc9c0a16 --- /dev/null +++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerDTcpExample3Client.java @@ -0,0 +1,86 @@ +package MV3500Cohort2021JulySeptember.homework2.HittnerD; +import java.io.*; +import java.net.*; + +/** + * + * @author Dom Hittner + */ +public class HittnerDTcpExample3Client { + + /** 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) throws InterruptedException { + + // Local variables/fields + Socket socket = null; + InputStream is; + Reader isr; + BufferedReader br; + String serverMessage; + int clientLoopCount = 0; + + try { + while (true) + { + clientLoopCount++; // increment at beginning of loop for reliability + System.out.println(HittnerDTcpExample3Client.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("=================================================="); + +// System.out.print ("Client loop " + clientLoopCount + ": "); + System.out.println("I am hungry"); + 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(500l); // slow things down, for example 500l (long) = 500 msec (1/2 second) + + } // end while(true) // infinite loops are dangerous, be sure to kill this process! + } + catch (IOException e) + { + System.err.println("Problem with " + HittnerDTcpExample3Client.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(HittnerDTcpExample3Client.class.getName() + " exit"); + } + } +} \ No newline at end of file