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Savage
NetworkedGraphicsMV3500
Commits
5142dae9
Commit
5142dae9
authored
4 years ago
by
Britt, Kyle (Capt)
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assignments/src/MV3500Cohort2020JulySeptember/homework1/BrittTCPExample1.java
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...00Cohort2020JulySeptember/homework1/BrittTCPExample1.java
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package
MV3500Cohort2020JulySeptember.homework1
;
import
java.io.IOException
;
import
java.io.OutputStream
;
import
java.io.PrintStream
;
import
java.net.ServerSocket
;
import
java.net.Socket
;
/**
*Homework #1 TCP Telnet Server
* @author Brittokki
*/
public
class
BrittTCPExample1
{
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
())
{
// 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 Captain Brittokki"
);
System
.
out
.
println
(
"This server response was written by Captain Brittokki"
);
// "flush()" in important in that it forces a write
// across what is in fact a slow connection
ps
.
flush
();
}
System
.
out
.
println
(
"TcpExample1 completed successfully."
);
}
catch
(
IOException
e
)
{
System
.
err
.
println
(
"Problem with TcpExample1Telnet 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
// 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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