From f3dc4f43b5193454def8ddd2dbdd13fb10b8f5d8 Mon Sep 17 00:00:00 2001
From: John Furr <John Furr@Johns_Asus>
Date: Tue, 24 Jul 2018 09:11:38 -0700
Subject: [PATCH] Since code is based on TCPexampe2, changed name to
Assignment2
---
.../homework1/FurrAssignment2.java | 93 +++++++++++++++++++
1 file changed, 93 insertions(+)
create mode 100644 projects/Assignments/2018JulySeptember/homework1/FurrAssignment2.java
diff --git a/projects/Assignments/2018JulySeptember/homework1/FurrAssignment2.java b/projects/Assignments/2018JulySeptember/homework1/FurrAssignment2.java
new file mode 100644
index 0000000000..e7d8f9b790
--- /dev/null
+++ b/projects/Assignments/2018JulySeptember/homework1/FurrAssignment2.java
@@ -0,0 +1,93 @@
+
+package FurrAssignment2;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * Very slightly more complex than example1. 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 localhost 2317
+ *
+ * If you're sophisticated you can contact the instructor's computer
+ * while running this program.
+ *
+ * telnet <ipOfServersLaptop> 2317
+ *
+ * And have him display the socket pairs he got.
+ * @author mcgredo
+ */
+public class FurrAssignment2
+{
+
+ 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.
+
+ int connectionCount = 0; // state
+ for(int i=2317; i<10; i++){
+ ServerSocket serverSocket = new ServerSocket(i);
+ System.out.println("server established for port #" +i);
+ }
+
+ // Loop, infinitely, waiting for client connections.
+ // Stop the program somewhere else.
+ while(true)
+ {
+ Socket clientConnection = serverSocket.accept(); // blocks! then proceeds once a connection is "accept"ed
+
+ connectionCount++; // got another one!
+
+ OutputStream os = clientConnection.getOutputStream();
+ PrintStream ps = new PrintStream(os);
+
+ ps.println("This client response was written by server TcpExample2"); // to remote client
+ System.out.println("This server response was written by server TcpExample2"); // to server console
+
+ // Print some information locally about the Socket
+ // connection. This includes the port and IP numbers
+ // on both sides (the socket pair.)
+
+ InetAddress localAddress = clientConnection.getLocalAddress();
+ InetAddress remoteAddress = clientConnection.getInetAddress();
+
+ int localPort = clientConnection.getLocalPort();
+ int remotePort = clientConnection.getPort();
+
+ // 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("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " +
+ remoteAddress.toString() + ", " + remotePort + " ))");
+
+ System.out.println("got another connection, #" + connectionCount); // report progress
+
+ // Notice the use of flush() and close(). Without
+ // the close() to Socket object may stay open for
+ // a while after the client has stopped needing this
+ // connection. Close() explicitly ends the connection.
+ ps.flush();
+ clientConnection.close();
+ }
+ }
+ catch(Exception e)
+ {
+ System.out.println("problem with networking: " + e);
+ }
+
+ }
+
+}
--
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