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Savage
NetworkedGraphicsMV3500
Commits
f976e4ef
Commit
f976e4ef
authored
3 years ago
by
snapp
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Add AllenTcpExample1Telnet1.java to homework1 folder
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assignments/src/MV3500Cohort2021JulySeptember/homework1/AllenTcpExample1Telnet1.java
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assignments/src/MV3500Cohort2021JulySeptember/homework1/AllenTcpExample1Telnet1.java
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f976e4ef
package
MV3500Cohort2021JulySeptember.homework1
;;
import
java.io.*
;
import
java.net.*
;
import
java.io.*
;
import
java.net.*
;
import
java.io.*
;
import
java.net.*
;
import
java.io.*
;
import
java.net.*
;
/**
* The simplest possible TCP network program. It listens for
* a connection, from telnet (telnet localhost 2317) or a program
* you write, which we will do later. Right now the TcpExample simply
* writes a string in response to a connection.
*
* Modifying his program is the basis for Assignment 1.
*
* Testing the running server program from telnet looks like this:
*
* it154916:projects mcgredo$ telnet localhost 2317
* Trying ::1...
* Connected to localhost.
* Escape character is '^]'.
* This was written by the server
* Connection closed by foreign host.
*
* Notice that "This was written by the server" matches
* what is written by the code below, over the output stream.
*
* After this first connection the program below drops out
* the bottom of the program, and does not repeat itself.
* The program exits.
*
* @author mcgredo
* @author brutzman
*/
public
class
AllenTcpExample1Telnet1
{
/**
* Program invocation, execution starts here
* @param args command-line arguments
*/
public
static
void
main
(
String
[]
args
)
{
try
{
System
.
out
.
println
(
"TcpExample1Telnet has started and is waiting for a connection."
);
System
.
out
.
println
(
" help: https://savage.nps.edu/Savage/developers.html#telnet"
);
System
.
out
.
println
(
" enter (telnet localhost 2317) or (nc localhost 2317)..."
);
// The ServerSocket waits for a connection from a client.
// It returns a Socket object when the connection occurs.
ServerSocket
serverSocket
=
new
ServerSocket
(
2317
);
// Use Java io classes to write text (as opposed to
// unknown bytes of some sort) to the client
// The Socket object represents the connection between
// the server and client, including a full duplex connection
try
(
Socket
clientConnection
=
serverSocket
.
accept
())
// wait here for a client to connect
{
// OK we got something, time to respond!
// Use Java io classes to write text (as opposed to
// unknown bytes of some sort) to the client
OutputStream
os
=
clientConnection
.
getOutputStream
();
PrintStream
ps
=
new
PrintStream
(
os
);
ps
.
println
(
"This client response was written by John Allen "
);
// to remote client
ps
.
println
(
"MOVES 2021 Cohort is well described by Johnny Smiles."
);
System
.
out
.
println
(
"This server response was written by John Allen "
);
// to server console
// "flush()" in important in that it forces a write
// across what is in fact a slow connection
ps
.
flush
();
}
System
.
out
.
println
(
" completed successfully."
);
}
catch
(
IOException
e
)
{
System
.
err
.
println
(
" Pardon the interruption, networking issue"
);
// describe what is happening
System
.
err
.
println
(
e
);
// Provide more helpful information to user if exception occurs due to running twice at one time
// brute force exception checking, can be brittle if exception message changes
// if (e.getMessage().equals("Address already in use: NET_Bind"))
if
(
e
instanceof
java
.
net
.
BindException
)
System
.
err
.
println
(
"*** Be sure to stop any other running instances of programs using this port!"
);
}
}
}
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