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Commit 0e57e8dc authored by Brutzman, Don's avatar Brutzman, Don
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debug testing with Terry and Don

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examples/src/TcpExamples/TcpExample2ConnectionCounting.java
+ 22
− 13
View file @ 0e57e8dc
...@@ -33,16 +33,10 @@ public class TcpExample2ConnectionCounting ...@@ -33,16 +33,10 @@ public class TcpExample2ConnectionCounting
{ {
System.out.println("TcpExample2ConnectionCounting has started and is waiting for a connection."); System.out.println("TcpExample2ConnectionCounting has started and is waiting for a connection.");
System.out.println(" help: https://savage.nps.edu/Savage/developers.html#telnet"); System.out.println(" help: https://savage.nps.edu/Savage/developers.html#telnet");
// Where are we? In other words, what is our host number? Advertise it System.out.println(" Windows ipconfig (or Mac ifconfig) indicates current IPv4_Address (for example local wireless IP address)");
// https://stackoverflow.com/questions/9481865/getting-the-ip-address-of-the-current-machine-using-java System.out.println(" Windows enter (telnet localhost 2317) or Mac enter (nc localhost 2317) for loopback operation, or" );
String localHostAddress = Inet4Address.getLocalHost().toString(); System.out.println(" Windows enter (telnet IPv4_Address 2317) or Mac enter (nc IPv4_Address 2317) for LAN operation" );
System.out.println("Local host address is " + localHostAddress); System.out.println("TcpExample2ConnectionCounting server standing by..." );
if (localHostAddress.contains("/"))
localHostAddress = localHostAddress.substring(localHostAddress.indexOf("/")+1);
// show localhost IP number to facilitate connections over local area network (LAN, WAN)
System.out.println(" enter (nc localhost 2317) or (telnet localhost 2317) for local operation" );
System.out.println(" enter (nc " + localHostAddress + " 2317) or " +
"(telnet " + localHostAddress + " 2317)..." );
// ServerSocket waits for a connection from a client. // ServerSocket waits for a connection from a client.
// Notice that it is outside the loop; ServerSocket needs to be made only once. // Notice that it is outside the loop; ServerSocket needs to be made only once.
...@@ -51,18 +45,33 @@ public class TcpExample2ConnectionCounting ...@@ -51,18 +45,33 @@ public class TcpExample2ConnectionCounting
ServerSocket serverSocket = new ServerSocket(2317); // server decides here what port to listen on. ServerSocket serverSocket = new ServerSocket(2317); // server decides here what port to listen on.
// of interest: often client doesn't care what port it uses locally when connecting to that server port. // of interest: often client doesn't care what port it uses locally when connecting to that server port.
// Loop, infinitely, waiting for client connections. // Loop, infinitely, waiting for client connections.
// Stop the program somewhere else. // Stop the program somewhere else.
while(true) while(true)
{ {
// blocks! then proceeds once a connection is "accept"ed // serverSocket.accept() blocks! then proceeds once a connection is "accept"ed
try (Socket clientConnection = serverSocket.accept()) { try (Socket clientConnection = serverSocket.accept()) {
connectionCount++; // got another one! connectionCount++; // got another one!
OutputStream os = clientConnection.getOutputStream(); OutputStream os = clientConnection.getOutputStream();
PrintStream ps = new PrintStream(os); PrintStream ps = new PrintStream(os);
// if (connectionCount == 1) // first time through, report connection
// {
// // Where are we? In other words, what is our host number? Advertise it.
// // Note that we use the serverSocket to get address, since host may have multiple network connections.
// // https://stackoverflow.com/questions/9481865/getting-the-ip-address-of-the-current-machine-using-java
// String localHostAddress = clientConnection.getInetAddress().getHostAddress();
// System.out.println("Local host address is " + localHostAddress);
// if (localHostAddress.contains("/"))
// localHostAddress = localHostAddress.substring(localHostAddress.indexOf("/")+1);
// // show localhost IP number to facilitate connections over local area network (LAN, WAN)
// System.out.println(" enter (nc localhost 2317) or (telnet localhost 2317) for local operation" );
// System.out.println(" enter (nc " + localHostAddress + " 2317) or " +
// "(telnet " + localHostAddress + " 2317)..." );
// }
ps.println("This client response was written by server " + TcpExample2ConnectionCounting.class.getName()); // to remote client ps.println("This client response was written by server " + TcpExample2ConnectionCounting.class.getName()); // to remote client
System.out.println("This server response was written by server " + TcpExample2ConnectionCounting.class.getName()); // to server console System.out.println("This server response was written by server " + TcpExample2ConnectionCounting.class.getName()); // to server console
...@@ -83,7 +92,7 @@ public class TcpExample2ConnectionCounting ...@@ -83,7 +92,7 @@ public class TcpExample2ConnectionCounting
// //
// Why is first IP/port the same, while the second set has different ports? // Why is first IP/port the same, while the second set has different ports?
System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " + System.out.println("Socket pair (server, client): (( " + localAddress.toString() + ", " + localPort + " ), ( " +
remoteAddress.toString() + ", " + remotePort + " ))"); remoteAddress.toString() + ", " + remotePort + " ))");
System.out.println("got another connection, #" + connectionCount); // report progress System.out.println("got another connection, #" + connectionCount); // report progress
......
examples/src/TcpExamples/TcpExample2ConnectionCountingTerminalLog.txt
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View file @ 0e57e8dc
Invocation instructions: Invocation instructions:
1. run/debug TcpExample2.java 1. run/debug TcpExample2ConnectionCounting.java
2. console: nc localhost 2317
alternate: telnet localhost 2217 2. Windows: ipconfig
MacOS: ifconfig
3. Windows: telnet localhost 2317
MacOS: nc localhost 2317
Program responses: Program responses:
=================================================== ===================================================
run: run-single:
TcpExample2ConnectionCounting has started and is waiting for a connection: telnet localhost 2317 TcpExample2ConnectionCounting has started and is waiting for a connection.
This server response was written by server TcpExample2ConnectionCounting help: https://savage.nps.edu/Savage/developers.html#telnet
Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 57630 )) Windows ipconfig (or Mac ifconfig) indicates current IPv4_Address (for example local wireless IP address)
Windows enter (telnet localhost 2317) or Mac enter (nc localhost 2317) for loopback operation, or
Windows enter (telnet IPv4_Address 2317) or Mac enter (nc IPv4_Address 2317) for LAN operation
TcpExample2ConnectionCounting server standing by...
This server response was written by server TcpExamples.TcpExample2ConnectionCounting
Socket pair (server, client): (( /172.20.154.38, 2317 ), ( /172.20.153.125, 55424 ))
got another connection, #1 got another connection, #1
This server response was written by server TcpExample2ConnectionCounting This server response was written by server TcpExamples.TcpExample2ConnectionCounting
Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 57631 )) Socket pair (server, client): (( /172.20.154.38, 2317 ), ( /172.20.153.125, 55425 ))
got another connection, #2 got another connection, #2
This server response was written by server TcpExample2ConnectionCounting This server response was written by server TcpExamples.TcpExample2ConnectionCounting
Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 57633 )) Socket pair (server, client): (( /172.20.154.38, 2317 ), ( /172.20.153.125, 55426 ))
got another connection, #3 got another connection, #3
This server response was written by server TcpExamples.TcpExample2ConnectionCounting
Socket pair (server, client): (( /172.20.154.38, 2317 ), ( /172.20.153.125, 55427 ))
got another connection, #4
This server response was written by server TcpExamples.TcpExample2ConnectionCounting
Socket pair (server, client): (( /172.20.154.38, 2317 ), ( /172.20.153.125, 55428 ))
got another connection, #5
This server response was written by server TcpExamples.TcpExample2ConnectionCounting
Socket pair (server, client): (( /172.20.154.38, 2317 ), ( /172.20.154.38, 49308 ))
got another connection, #6
=================================================== ===================================================
don@it154928 /cygdrive/c/Program Files/NetBeans 8.2
$ telnet localhost 2317 $ telnet localhost 2317
Trying ::1...
Connected to localhost.
Escape character is '^]'.
This client response was written by server TcpExample2
You were connection #1, by my count
Connection closed by foreign host.
don@it154928 /cygdrive/c/Program Files/NetBeans 8.2 This client response was written by server TcpExamples.TcpExample2ConnectionCounting
$ telnet localhost 2317 You were connection #6, by my count
Trying ::1...
Connected to localhost. Connection to host lost.
Escape character is '^]'. ===================================================
This client response was written by server TcpExample2 \ No newline at end of file
You were connection #2, by my count
Connection closed by foreign host.
don@it154928 /cygdrive/c/Program Files/NetBeans 8.2
$ telnet localhost 2317
Trying ::1...
Connected to localhost.
Escape character is '^]'.
This client response was written by server TcpExample2
You were connection #3, by my count
Connection closed by foreign host.
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