Skip to content
Snippets Groups Projects
Commit 808b54c0 authored by Brutzman, Don's avatar Brutzman, Don
Browse files

Merge branch 'master' of https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500

parents 27e8b172 355f4f7b
No related branches found
No related tags found
No related merge requests found
Hide whitespace changes
Inline Side-by-side
Showing
with 1516 additions and 69 deletions
MV3500Cohort2021JulySeptember/homework1/FrankClient.java 0 → 100644
+ 100
− 0
View file @ 808b54c0
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.Socket;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author justi
*/
public class FrankClient {
/**
*/
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
*/
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(FrankClient.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, 2318); // 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("now we're talking!");
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(500l); // slow things down, for example 500l (long) = 500 msec
} // end while(true) // infinite loops are dangerous, be sure to kill this process!
}
catch (IOException e)
{
System.err.println("Problem with " + FrankClient.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( "FrankClient.class.getName() + exit");
}
}
}
MV3500Cohort2021JulySeptember/homework1/FrankServer.java 0 → 100644
+ 101
− 0
View file @ 808b54c0
import java.io.*;
import java.net.*;
/**
* 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 2318
*
* 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 mcgredo
* @author brutzman
*/
public class FrankServer {
/**
* Program invocation, execution starts here
* If already compiled, can run using console in directory ../../build/classes/ by invoking \
* java -classpath . TcpExamples.TcpExample3Server
* @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(FrankServer.class.getName() + " has started..."); // it helps debugging to put this on console first
ServerSocket serverSocket = new ServerSocket(2318);
OutputStream os;
PrintStream ps;
InetAddress localAddress, remoteAddress;
int localPort, remotePort;
int serverLoopCount = 0;
// Server is up and waiting (i.e. "blocked" or paused)
// Loop, infinitely, waiting for client connections.
// Stop the program somewhere else.
while (true) {
// block until connected to a client
try (Socket clientConnectionSocket = serverSocket.accept())
{
serverLoopCount++; // increment at beginning of loop for reliability
// Now hook everything up (i.e. set up the streams), Java style:
os = clientConnectionSocket.getOutputStream();
ps = new PrintStream(os);
ps.println("This is response " + serverLoopCount + " produced by the server."); // 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();
System.out.print ("Server loop " + serverLoopCount + ": ");
// 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(FrankServer.class.getName() + " socket pair showing host name, address, port:");
System.out.println(" (( " +
localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( " +
remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
if ( localAddress.getHostName().equals( localAddress.getHostAddress()) ||
remoteAddress.getHostName().equals(remoteAddress.getHostAddress()))
System.out.println(" note HostName matches address if host has no DNS name");
// Not/*i*/ce 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.
ps.flush();
// like it or not, you're outta here!
}
}
} catch (IOException e) {
System.err.println("Problem with " + FrankServer.class.getName() + " 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!");
}
}
}
}
MV3500Cohort2021JulySeptember/homework1/FrankTCPExample3Client.java 0 → 100644
+ 100
− 0
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.Socket;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author justi
*/
public class FrankTCPExample3Client {
/**
*/
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
*/
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(FrankTCPExample3Client.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, 2318); // 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("now we're talking!");
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(500l); // slow things down, for example 500l (long) = 500 msec
} // end while(true) // infinite loops are dangerous, be sure to kill this process!
}
catch (IOException e)
{
System.err.println("Problem with " + FrankTCPExample3Client.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( "FrankTCPExample3Client.class.getName() + exit");
}
}
}
assignments/ReportingForDuty.md
+ 13
− 5
View file @ 808b54c0
## Reporting For Duty
Everyone in the course is hereby requested to make a change to this file. This confirms your ability to use Netbeans and your gitlab.nps.edu account.
Everyone in the course is hereby requested to make a change to this file. This confirms your ability to use NetBeans and your gitlab.nps.edu account.
Be sure to *git update* before, and be sure to *git commit* and *git push* after!
More information on your use of Git is in the parent directory [README.md](../../README.md)
- Don Brutzman
---
### 2021
- Terry is here!
- Kurt Reynolds
- Rick Lentz
- Nick Hittner
- Dom Hittner
- test 123
- Nick Hittner
- Matt Robinson
- Alex Fisher
- John Morris
- Max Schlessel
- Justin McNeely
- John Allen
### 2020
- Bernd Weissenberger
......
assignments/src/MV3500Cohort2021JulySeptember/homework1/AllenTcpExample1Telnet1.java 0 → 100644
+ 92
− 0
View file @ 808b54c0
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!");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java
+ 64
− 64
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
/**
*
* @author adfis
*/
public class FisherTCPExample1Telnet {
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("Client response was written by Alex' server TcpExample1."); // to remote clientnc
ps.println("We are crushing this assignment, good work.");
System.out.println("Server response was written by Alex' server TcpExample1."); // to server console
System.out.println("SUCCESS!");
// "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!");
}
}
}
package MV3500Cohort2021JulySeptember.homework1;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
/**
*
* @author adfis
*/
public class FisherTCPExample1Telnet {
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("Client response was written by Alex' server TcpExample1."); // to remote clientnc
ps.println("We are crushing this assignment, good work.");
System.out.println("Server response was written by Alex' server TcpExample1."); // to server console
System.out.println("SUCCESS!");
// "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 FisherTCPExample1Telnet 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!");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/FrankTCPExample3Client.java 0 → 100644
+ 96
− 0
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.Socket;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author justi
*/
public class FrankTCPExample3Client {
/**
*/
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
*/
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(FrankTCPExample3Client.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, 2318); // 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("now we're talking!");
System.out.println("The message the server sent was: '" + serverMessage + "'");
// socket gets closed, either automatically/silently by this code (or possibly by the server)
if (serverMessage.equals("this is good bye message from the server")) { //if client recieved termanation message stop client
break;
}
Thread.sleep(1000); // turned it down to 1 second
} // end while(true) // infinite loops are dangerous, be sure to kill this process!
} catch (IOException e) {
System.err.println("Problem with " + FrankTCPExample3Client.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("FrankTCPExample3Client.class.getName() + exit");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/FrankTCPExample3Server.JPG 0 → 100644
+ 0
− 0
View file @ 808b54c0
assignments/src/MV3500Cohort2021JulySeptember/homework1/FrankTCPExample3Server.JPG

56.9 KiB

assignments/src/MV3500Cohort2021JulySeptember/homework1/FrankTCPExample3Server.java 0 → 100644
+ 107
− 0
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;
import java.io.*;
import java.net.*;
/**
* 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 2318
*
* 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 mcgredo
* @author brutzman
*/
public class FrankTCPExample3Server {
/**
* Program invocation, execution starts here If already compiled, can run
* using console in directory ../../build/classes/ by invoking \ java
* -classpath . TcpExamples.TcpExample3Server
*
* @param args command-line arguments
*/
public static void main(String[] args) throws InterruptedException {
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(FrankTCPExample3Server.class.getName() + " has started..."); // it helps debugging to put this on console first
ServerSocket serverSocket = new ServerSocket(2318); // changed from 2317 to 2318
OutputStream os;
PrintStream ps;
InetAddress localAddress, remoteAddress;
int localPort, remotePort;
int serverLoopCount = 0;
// Server is up and waiting (i.e. "blocked" or paused)
// Loop, infinitely, waiting for client connections.
// Stop the program somewhere else.
while (true) {
// block until connected to a client
try ( Socket clientConnectionSocket = serverSocket.accept()) {
serverLoopCount++; // increment at beginning of loop for reliability
// Now hook everything up (i.e. set up the streams), Java style:
os = clientConnectionSocket.getOutputStream();
ps = new PrintStream(os);
if (serverLoopCount <= 20) { // checking if the loop count <= 20
ps.println("This is response " + serverLoopCount + " produced by the server."); // this gets sent back to client!
} else {
ps.println("this is good bye message from the server"); // termination after 20 messages
break; // Stop server
}
// 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();
System.out.print("Server loop " + serverLoopCount + ": ");
// 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(FrankTCPExample3Server.class.getName() + " socket pair showing host name, address, port:");
System.out.println(" (( "
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( "
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
if (localAddress.getHostName().equals(localAddress.getHostAddress())
|| remoteAddress.getHostName().equals(remoteAddress.getHostAddress())) {
System.out.println(" note HostName matches address if host has no DNS name");
}
// Not/*i*/ce 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.
ps.flush();
// like it or not, you're outta here!
}
}
} catch (IOException e) {
System.err.println("Problem with " + FrankTCPExample3Server.class.getName() + " 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!");
}
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/FrankTCPExample3ServerClient.JPG 0 → 100644
+ 0
− 0
View file @ 808b54c0
assignments/src/MV3500Cohort2021JulySeptember/homework1/FrankTCPExample3ServerClient.JPG

31.6 KiB

assignments/src/MV3500Cohort2021JulySeptember/homework1/HittnerDomTcpExample1Telnet.java 0 → 100644
+ 63
− 0
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
/**
*
* @author adfis
*/
public class HittnerDomTcpExample1Telnet {
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("Client response was brought to you by the Domo"); // to remote clientnc
ps.println("DomsaMom");
System.out.println("Client response was brought to you by the Domo"); // to server console
System.out.println("DomsaMom");
// "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!");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/HittnerNickTcpExample1Telnet.java 0 → 100644
+ 63
− 0
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
/**
*
* @author adfis
*/
public class HittnerNickTcpExample1Telnet {
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("Client response was brought to you by the Highlander"); // to remote clientnc
ps.println("There Can Be Only One");
System.out.println("Client response was brought to you by the Highlander"); // to server console
System.out.println("There Can be Only One");
// "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!");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/KeevenTCPExample3Client.java 0 → 100644
+ 99
− 0
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;
import java.io.*;
import java.net.*;
/**
* This is Assignment 1 where I have modified the given code from TCPExample3Client
* -sleep time has been extended to give more time in between loops
* -Initial print line has been altered to reflect assingnment 1
* -Loop only runs a finite number of times ,10.
* 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 KeevenTCPExample3Client {
/** 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
*/
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;
int numbLoops = 10;
try {
while (clientLoopCount < numbLoops)
{
clientLoopCount++; // increment at beginning of loop for reliability
System.out.println(KeevenTCPExample3Client.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("======================Assignment1===========================");
System.out.print ("Client loop " + clientLoopCount + ": ");
System.out.println("now we're talking!");
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(800l); // slow things down, for example 500l (long) = 500 msec
} // end while(true) // infinite loops are dangerous, be sure to kill this process!
}
catch (IOException e)
{
System.err.println("Problem with " + KeevenTCPExample3Client.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(KeevenTCPExample3Client.class.getName() + " exit");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/KeevenTCPExample3Server.java 0 → 100644
+ 107
− 0
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;
import java.io.*;
import java.net.*;
/**
* This is Assignment 1 where I have modified the given code from TCPExample3Server
*-server response message changed
*
* 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 mcgredo
* @author brutzman
*/
public class KeevenTCPExample3Server {
/**
* Program invocation, execution starts here
* If already compiled, can run using console in directory ../../build/classes/ by invoking \
* java -classpath . TcpExamples.TcpExample3Server
* @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(KeevenTCPExample3Server.class.getName() + " 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;
int serverLoopCount = 0;
// Server is up and waiting (i.e. "blocked" or paused)
// Loop, infinitely, waiting for client connections.
// Stop the program somewhere else.
while (true) {
// block until connected to a client
try (Socket clientConnectionSocket = serverSocket.accept())
{
serverLoopCount++; // increment at beginning of loop for reliability
// Now hook everything up (i.e. set up the streams), Java style:
os = clientConnectionSocket.getOutputStream();
ps = new PrintStream(os);
ps.println("This is response " + serverLoopCount + " produced by the server, "
+ KeevenTCPExample3Server.class.getName()); // 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();
System.out.print ("Server loop " + serverLoopCount + ": ");
// 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(KeevenTCPExample3Server.class.getName() + " socket pair showing host name, address, port:");
System.out.println(" (( " +
localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( " +
remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
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.
ps.flush();
// like it or not, you're outta here!
}
}
} catch (IOException e) {
System.err.println("Problem with " + KeevenTCPExample3Server.class.getName() + " 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!");
}
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/LeckieTcpExample2.java 0 → 100644
+ 103
− 0
View file @ 808b54c0
package pkg3500.leckie;
import java.io.IOException;
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. 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.
*
* <code>telnet localhost 2317</code>
*
* If you're sophisticated you can contact the instructor's computer
* while running this program.
*
* <code>telnet ipOfServersLaptop 2317</code>
*
* And have that machine display the socket pairs received.
* @author mcgredo
* @author brutzman
* @author leckie
*/
public class LeckieTcpExample2
{
public static void main(String[] args)
{
try
{
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(" enter (nc localhost 2317) or (telnet localhost 2317)..." );
// ServerSocket waits for a connection from a client.
// Notice that it is outside the loop; ServerSocket needs to be made only once.
int connectionCount = 0; // state variable
int totalEntrantCount = 31; // spoofed entrants
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.
// Loop, infinitely, waiting for client connections.
// Stop the program somewhere else.
while(true)
{
// blocks! then proceeds once a connection is "accept"ed
try (Socket clientConnection = serverSocket.accept()) {
connectionCount++; // got another one!
OutputStream os = clientConnection.getOutputStream();
PrintStream ps = new PrintStream(os);
ps.println("This client response was written by server " + LeckieTcpExample2.class.getName()); // to remote client
System.out.println("This server response was written by server " + LeckieTcpExample2.class.getName()); // to server console
ps.println("This is your lottery attempt number #" + connectionCount + ", you are aplicant number " + totalEntrantCount + " to try and win. Keep trying!");
totalEntrantCount = (totalEntrantCount + 79);
// Print some information locally about the Socket connection.
// This includes the port and IP numbers on both sides (the socket pair.)
InetAddress localAddress = clientConnection.getLocalAddress();
InetAddress remoteAddress = clientConnection.getInetAddress();
int localPort = clientConnection.getLocalPort();
int remotePort = clientConnection.getPort(); // remember the prior question, why are 2 ports different?
// 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 )) note IPv6
// Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
//
// Why is first IP/port the same, while the second set has different ports?
System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " +
remoteAddress.toString() + ", " + remotePort + " ))");
System.out.println("got another connection, #" + connectionCount); // report progress
// Notice the use of flush() and close(). Without
// the close() to Socket object may stay open for
// a while after the client has stopped needing this
// connection. Close() explicitly ends the connection.
ps.flush();
}
}
}
catch(IOException e)
{
System.err.println("Problem with " + LeckieTcpExample2.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!");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/MorrisTcpExample1Telnet.java 0 → 100644
+ 86
− 0
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;;
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 MorrisTcpExample1Telnet
{
/**
* 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 Johnny Smiles "); // to remote client
ps.println("MOVES 2021 Cohort is full of badassery.");
System.out.println("This server response was written by Johnny Smiles " ); // 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!");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/ReynoldsTcpExample1Telnet1.java 0 → 100644
+ 63
− 0
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
/**
*
* @author kReynolds
*/
public class ReynoldsTcpExample1Telnet1 {
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("Client response was brought to you by the Domo"); // to remote clientnc
ps.println("DomsaMom");
System.out.println("Client response was brought to you by the Domo"); // to server console
System.out.println("DomsaMom");
// "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!");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/RobinsonTcpExample1Telnet.java 0 → 100644
+ 60
− 0
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
/**
*
* @author mrobi
*/
public class RobinsonTcpExample1Telnet {
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("Client response was written by Matt's server TcpExample1."); // to remote clientnc
ps.println("Can you hear me?");
System.out.println("Client response was written by Matt's server TcpExample1."); // to server console
System.out.println("Yes");
// "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 FisherTCPExample1Telnet 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!");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework1/TcpExample2_Leckie_Mod_Hw1.java 0 → 100644
+ 103
− 0
View file @ 808b54c0
package pkg3500.leckie;
import java.io.IOException;
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. 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.
*
* <code>telnet localhost 2317</code>
*
* If you're sophisticated you can contact the instructor's computer
* while running this program.
*
* <code>telnet ipOfServersLaptop 2317</code>
*
* And have that machine display the socket pairs received.
* @author mcgredo
* @author brutzman
* @author leckie
*/
public class TcpExample2_Leckie_Mod_Hw1
{
public static void main(String[] args)
{
try
{
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(" enter (nc localhost 2317) or (telnet localhost 2317)..." );
// ServerSocket waits for a connection from a client.
// Notice that it is outside the loop; ServerSocket needs to be made only once.
int connectionCount = 0; // state variable
int totalEntrantCount = 31; // spoofed entrants
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.
// Loop, infinitely, waiting for client connections.
// Stop the program somewhere else.
while(true)
{
// blocks! then proceeds once a connection is "accept"ed
try (Socket clientConnection = serverSocket.accept()) {
connectionCount++; // got another one!
OutputStream os = clientConnection.getOutputStream();
PrintStream ps = new PrintStream(os);
ps.println("This client response was written by server " + TcpExample2_Leckie_Mod_Hw1.class.getName()); // to remote client
System.out.println("This server response was written by server " + TcpExample2_Leckie_Mod_Hw1.class.getName()); // to server console
ps.println("This is your lottery attempt number #" + connectionCount + ", you are aplicant number " + totalEntrantCount + " to try and win. Keep trying!");
totalEntrantCount = (totalEntrantCount + 79);
// Print some information locally about the Socket connection.
// This includes the port and IP numbers on both sides (the socket pair.)
InetAddress localAddress = clientConnection.getLocalAddress();
InetAddress remoteAddress = clientConnection.getInetAddress();
int localPort = clientConnection.getLocalPort();
int remotePort = clientConnection.getPort(); // remember the prior question, why are 2 ports different?
// 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 )) note IPv6
// Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
//
// Why is first IP/port the same, while the second set has different ports?
System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " +
remoteAddress.toString() + ", " + remotePort + " ))");
System.out.println("got another connection, #" + connectionCount); // report progress
// Notice the use of flush() and close(). Without
// the close() to Socket object may stay open for
// a while after the client has stopped needing this
// connection. Close() explicitly ends the connection.
ps.flush();
}
}
}
catch(IOException e)
{
System.err.println("Problem with " + TcpExample2_Leckie_Mod_Hw1.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!");
}
}
}
examples/src/MV3500Cohort2021JulySeptember/homework1/FrankTCPExample3Client.java 0 → 100644
+ 96
− 0
View file @ 808b54c0
package MV3500Cohort2021JulySeptember.homework1;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.Socket;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author justi
*/
public class FrankTCPExample3Client {
/**
*/
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
*/
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(FrankTCPExample3Client.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, 2318); // 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("now we're talking!");
System.out.println("The message the server sent was: '" + serverMessage + "'");
// socket gets closed, either automatically/silently by this code (or possibly by the server)
if (serverMessage.equals("this is good bye message from the server")) { //if client recieved termanation message stop client
break;
}
Thread.sleep(1000); // turned it down to 1 second
} // end while(true) // infinite loops are dangerous, be sure to kill this process!
} catch (IOException e) {
System.err.println("Problem with " + FrankTCPExample3Client.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("FrankTCPExample3Client.class.getName() + exit");
}
}
}
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment