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Commit 8a8f0c6b authored by Fisher, Alexander (Alex) (Capt)'s avatar Fisher, Alexander (Alex) (Capt)
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Homework 2 - Final

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package MV3500Cohort2021JulySeptember.homework2.Fisher;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
/**
* Very slightly more complex than example1, further modifying example2. 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 (nc) localhost 2317
*
* If you're sophisticated you can contact the instructor's computer while
* running this program.
*
* telnet (nc) [ipNumberOfServerLaptop] 2317
*
* and have the instructor display the socket pairs received.
*
* @author adfis
*/
public class FisherServer {
/**
* @param args command-line arguments
*/
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.
System.out.println("FisherServer has started..."); // it helps debugging to put this on console first
ServerSocket serverSocket = new ServerSocket(2317);
OutputStream os;
PrintStream ps;
InetAddress localAddress, remoteAddress;
int localPort, remotePort;
InputStream is;
InputStreamReader isr;
BufferedReader br;
int serverLoopCount = 1;
// Server is up and waiting (i.e. "blocked" or paused)
// Loop, infinitely, waiting for client connections.
// Stop the program somewhere else.
while (serverLoopCount <= 10) {
// block until connected to a client
try ( Socket clientConnectionSocket = serverSocket.accept()) {
// Now hook everything up (i.e. set up the streams), Java style:
os = clientConnectionSocket.getOutputStream();
ps = new PrintStream(os);
ps.println("Why did the chicken cross the road?"); // this gets sent back to client!
// Print some information locally about the Socket connection.
// This includes the port and IP numbers on both sides (the socket pair).
localAddress = clientConnectionSocket.getLocalAddress();
remoteAddress = clientConnectionSocket.getInetAddress();
localPort = clientConnectionSocket.getLocalPort();
remotePort = clientConnectionSocket.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("FisherServer socket pair showing host name, address, port:");
System.out.println(" (( "
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( "
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
is = clientConnectionSocket.getInputStream();
isr = new InputStreamReader(is);
br = new BufferedReader(isr);
if (localAddress.getHostName().equals(localAddress.getHostAddress())
|| remoteAddress.getHostName().equals(remoteAddress.getHostAddress())) {
System.out.println(" note HostName matches address if host has no DNS name");
}
// Notice the use of flush() and try w/ resources. Without
// the try w/ resources the Socket object may stay open for
// a while after the client has stopped needing this
// connection. try w/ resources explicitly ends the connection.
serverLoopCount++;
ps.flush();
// like it or not, you're outta here!
}
}
} catch (IOException e) {
System.err.println("Problem with FisherServer networking: " + 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!");
}
}
}
}
package MV3500Cohort2021JulySeptember.homework2.Fisher;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
/**
* Very slightly more complex than example1, further modifying example2. 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 (nc) localhost 2317
*
* If you're sophisticated you can contact the instructor's computer while
* running this program.
*
* telnet (nc) [ipNumberOfServerLaptop] 2317
*
* and have the instructor display the socket pairs received.
*
* @author adfis
*/
public class FisherServer {
/**
* @param args command-line arguments
*/
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.
System.out.println("FisherServer has started..."); // it helps debugging to put this on console first
ServerSocket serverSocket = new ServerSocket(2317);
OutputStream os;
PrintStream ps;
InetAddress localAddress, remoteAddress;
int localPort, remotePort;
InputStream is;
InputStreamReader isr;
BufferedReader br;
int serverLoopCount = 1;
// Server is up and waiting (i.e. "blocked" or paused)
// Loop, infinitely, waiting for client connections.
// Stop the program somewhere else.
// Made a loop counter for server to stop after 10 pings with client
while (serverLoopCount <= 10) {
// block until connected to a client
try ( Socket clientConnectionSocket = serverSocket.accept()) {
// Now hook everything up (i.e. set up the streams), Java style:
os = clientConnectionSocket.getOutputStream();
ps = new PrintStream(os);
ps.println("Why did the chicken cross the road?"); // this gets sent back to client!
// Print some information locally about the Socket connection.
// This includes the port and IP numbers on both sides (the socket pair).
localAddress = clientConnectionSocket.getLocalAddress();
remoteAddress = clientConnectionSocket.getInetAddress();
localPort = clientConnectionSocket.getLocalPort();
remotePort = clientConnectionSocket.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("FisherServer socket pair showing host name, address, port:");
System.out.println(" (( "
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( "
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
is = clientConnectionSocket.getInputStream();
isr = new InputStreamReader(is);
br = new BufferedReader(isr);
if (localAddress.getHostName().equals(localAddress.getHostAddress())
|| remoteAddress.getHostName().equals(remoteAddress.getHostAddress())) {
System.out.println(" note HostName matches address if host has no DNS name");
}
// Notice the use of flush() and try w/ resources. Without
// the try w/ resources the Socket object may stay open for
// a while after the client has stopped needing this
// connection. try w/ resources explicitly ends the connection.
serverLoopCount++;
ps.flush();
// like it or not, you're outta here!
}
}
} catch (IOException e) {
System.err.println("Problem with FisherServer networking: " + 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!");
}
}
}
}
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