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Savage
NetworkedGraphicsMV3500
Commits
846a7ac6
Commit
846a7ac6
authored
3 years ago
by
Hittner, Nicholas (MAJ)
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assignments/src/MV3500Cohort2021JulySeptember/homework2/HittnerNickTcpExample3Client.java
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cc6c6742
package
MV3500Cohort2021JulySeptember.homework2
;
import
java.io.*
;
import
java.net.*
;
/**
* Before, we always used telnet (netcat) to connect to the server. Here we are
* now writing our own program to do the connection.
*
* As you will see, when we run this after we start the server we will see the
* same string telnet printed, sent by the server. The output at the server will
* show different socket pairs for each time the loop iterates.
*
* @author mcgredo
* @author brutzman
*/
public
class
HittnerNickTcpExample3Client
{
/** 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
* @throws java.lang.InterruptedException user can cancel execution
*/
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
(
HittnerNickTcpExample3Client
.
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
(
"Good morning, Nick"
);
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
(
500
l
);
// 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 "
+
HittnerNickTcpExample3Client
.
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
(
HittnerNickTcpExample3Client
.
class
.
getName
()
+
" exit"
);
}
}
}
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