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Commit fcdc3758 authored by Brutzman, Don's avatar Brutzman, Don
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assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherClient.java
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package MV3500Cohort2021JulySeptember.homework2.Fisher; package MV3500Cohort2021JulySeptember.homework2.Fisher;
//import static MV3500Cohort2020JulySeptember.homework2.White.WhiteClient.LOCALHOST; //import static MV3500Cohort2020JulySeptember.homework2.White.WhiteClient.LOCALHOST;
import java.io.BufferedReader; import java.io.BufferedReader;
import java.io.IOException; import java.io.IOException;
import java.io.InputStream; import java.io.InputStream;
import java.io.InputStreamReader; import java.io.InputStreamReader;
import java.io.OutputStream; import java.io.OutputStream;
import java.io.PrintStream; import java.io.PrintStream;
import java.net.Socket; import java.net.Socket;
/** /**
* Before, we always used telnet (netcat) to connect to the server. Here we are * Before, we always used telnet (netcat) to connect to the server. Here we are
* now writing our own program to do the connection. * 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 * 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 * same string telnet printed, sent by the server. The output at the server will
* show different socket pairs for each time the loop iterates. * show different socket pairs for each time the loop iterates.
* *
* @author adfis * @author adfis
*/ */
public class FisherClient { public class FisherClient {
// IPv6 String constant for localhost address, similarly IPv4 127.0.0.1 // IPv6 String constant for localhost address, similarly IPv4 127.0.0.1
public final static String LOCALHOST = "0:0:0:0:0:0:0:1"; public final static String LOCALHOST = "172.20.145.10"; //"0:0:0:0:0:0:0:1";
// Sub with someone's IP
/** // Got it to work with McNeely in class
* Program invocation, execution starts here /**
* @param args command-line arguments * Program invocation, execution starts here
*/ * @param args command-line arguments
public static void main(String[] args) { */
public static void main(String[] args) {
// Local variables/fields
Socket socket; // Local variables/fields
InputStream is; Socket socket;
InputStreamReader isr; InputStream is;
BufferedReader br; InputStreamReader isr;
OutputStream os; BufferedReader br;
PrintStream ps; OutputStream os;
String serverMessage; PrintStream ps;
int clientLoopCount = 0; String serverMessage;
int clientLoopCount = 1;
try {
System.out.println("FisherClient creating socket..."); try {
while (true) { System.out.println("FisherClient creating socket...");
// Made a loop counter for client to stop after 10 pings with server
// We request an IP to connect to ("localhost") and while (clientLoopCount <= 10) {
// port number at that IP (2317). This establishes
// a connection to that IP in the form of a Socket // We request an IP to connect to ("localhost") and
// object; the server uses a ServerSocket to wait for // port number at that IP (2317). This establishes
// connections. // a connection to that IP in the form of a Socket
socket = new Socket(LOCALHOST, 2317); // locohost? // object; the server uses a ServerSocket to wait for
// connections.
os = socket.getOutputStream(); socket = new Socket(LOCALHOST, 2317);
ps = new PrintStream(os);
os = socket.getOutputStream();
// Now hook everything up (i.e. set up the streams), Java style: ps = new PrintStream(os);
is = socket.getInputStream();
isr = new InputStreamReader(is); // Now hook everything up (i.e. set up the streams), Java style:
br = new BufferedReader(isr); is = socket.getInputStream();
isr = new InputStreamReader(is);
// Read a single line written by the server. We'd br = new BufferedReader(isr);
// do things a bit differently if there were many lines to be read
// from the server instead of one only. // Read a single line written by the server. We'd
serverMessage = br.readLine(); // do things a bit differently if there were many lines to be read
System.out.println("=================================================="); // from the server instead of one only.
serverMessage = br.readLine();
System.out.println("The message the server sent was: '" + serverMessage + "'"); System.out.println("==================================================");
System.out.println("FisherClient responds with: To get to the other side");
// socket gets closed, either automatically/silently by this code (or possibly by the server) System.out.println("The message the server sent was: '" + serverMessage + "'");
System.out.println("FisherClient responds with: To get to the other side");
} // end while(true) System.out.println("Loop count: " + clientLoopCount);
} catch (IOException e) { clientLoopCount++;
System.err.println("Problem with FisherClient networking:"); // describe what is happening // socket gets closed, either automatically/silently by this code (or possibly by the server)
System.err.println("Error: " + e);
} // end while(true)
// Provide more helpful information to user if exception occurs due to running twice at one time } catch (IOException e) {
if (e instanceof java.net.BindException) { System.err.println("Problem with FisherClient networking:"); // describe what is happening
System.err.println("*** Be sure to stop any other running instances of programs using this port!"); System.err.println("Error: " + e);
}
} finally // occurs after any other activity when shutting down // Provide more helpful information to user if exception occurs due to running twice at one time
{ if (e instanceof java.net.BindException) {
// program exit: tell somebody about that happening. Likely cause: server drops connection. System.err.println("*** Be sure to stop any other running instances of programs using this port!");
System.out.println(); }
System.out.println("FisherClient exit"); } finally // occurs after any other activity when shutting down
} {
} // program exit: tell somebody about that happening. Likely cause: server drops connection.
System.out.println();
} System.out.println("FisherClient exit");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java
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package MV3500Cohort2021JulySeptember.homework2.Fisher; package MV3500Cohort2021JulySeptember.homework2.Fisher;
import static com.google.common.base.CharMatcher.is; import java.io.BufferedReader;
import java.io.BufferedReader; import java.io.IOException;
import java.io.IOException; import java.io.InputStream;
import java.io.InputStream; import java.io.InputStreamReader;
import java.io.InputStreamReader; import java.io.OutputStream;
import java.io.OutputStream; import java.io.PrintStream;
import java.io.PrintStream; import java.net.InetAddress;
import java.net.InetAddress; import java.net.ServerSocket;
import java.net.ServerSocket; import java.net.Socket;
import java.net.Socket;
/**
/** * Very slightly more complex than example1, further modifying example2. The
* Very slightly more complex than example1, further modifying example2. The * only thing this does differently is introduce a loop into the response, so
* 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
* 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
* the socket pair the server sees. Run the program via telnet several times and * compare the socket pairs.
* compare the socket pairs. *
* * telnet (nc) localhost 2317
* telnet (nc) localhost 2317 *
* * If you're sophisticated you can contact the instructor's computer while
* If you're sophisticated you can contact the instructor's computer while * running this program.
* running this program. *
* * telnet (nc) [ipNumberOfServerLaptop] 2317
* telnet (nc) [ipNumberOfServerLaptop] 2317 *
* * and have the instructor display the socket pairs received.
* and have the instructor display the socket pairs received. *
* * @author adfis
* @author adfis */
*/ public class FisherServer {
public class FisherServer {
/**
/** * @param args command-line arguments
* @param args command-line arguments */
*/ public static void main(String[] args) {
public static void main(String[] args) { try {
try {
// ServerSocket waits for a connection from a client.
// ServerSocket waits for a connection from a client. // Notice that it is outside the loop; ServerSocket
// Notice that it is outside the loop; ServerSocket // needs to be made only once.
// needs to be made only once. System.out.println("FisherServer has started..."); // it helps debugging to put this on console first
System.out.println("FisherServer has started..."); // it helps debugging to put this on console first
ServerSocket serverSocket = new ServerSocket(2317);
ServerSocket serverSocket = new ServerSocket(2317); OutputStream os;
OutputStream os; PrintStream ps;
PrintStream ps; InetAddress localAddress, remoteAddress;
InetAddress localAddress, remoteAddress; int localPort, remotePort;
int localPort, remotePort;
InputStream is;
InputStream is; InputStreamReader isr;
InputStreamReader isr; BufferedReader br;
BufferedReader br; int serverLoopCount = 1;
// Server is up and waiting (i.e. "blocked" or paused)
// Loop, infinitely, waiting for client connections. // Server is up and waiting (i.e. "blocked" or paused)
// Stop the program somewhere else. // Loop, infinitely, waiting for client connections.
while (true) { // Stop the program somewhere else.
// Made a loop counter for server to stop after 10 pings with client
// block until connected to a client while (serverLoopCount <= 10) {
try ( Socket clientConnectionSocket = serverSocket.accept()) {
// block until connected to a client
// Now hook everything up (i.e. set up the streams), Java style: try ( Socket clientConnectionSocket = serverSocket.accept()) {
os = clientConnectionSocket.getOutputStream();
ps = new PrintStream(os); // Now hook everything up (i.e. set up the streams), Java style:
ps.println("Why did the chicken cross the road?"); // this gets sent back to client! os = clientConnectionSocket.getOutputStream();
ps = new PrintStream(os);
// Print some information locally about the Socket connection. ps.println("Why did the chicken cross the road?"); // this gets sent back to client!
// This includes the port and IP numbers on both sides (the socket pair).
localAddress = clientConnectionSocket.getLocalAddress(); // Print some information locally about the Socket connection.
remoteAddress = clientConnectionSocket.getInetAddress(); // This includes the port and IP numbers on both sides (the socket pair).
localPort = clientConnectionSocket.getLocalPort(); localAddress = clientConnectionSocket.getLocalAddress();
remotePort = clientConnectionSocket.getPort(); 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 )) // My socket pair connection looks like this, to localhost:
// Why is the first IP/port the same, while the second set has different ports? // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 ))
System.out.println("FisherServer socket pair showing host name, address, port:"); // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
System.out.println(" (( " // Why is the first IP/port the same, while the second set has different ports?
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( " System.out.println("FisherServer socket pair showing host name, address, port:");
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))"); System.out.println(" (( "
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( "
is = clientConnectionSocket.getInputStream(); + remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
isr = new InputStreamReader(is);
br = new BufferedReader(isr); is = clientConnectionSocket.getInputStream();
isr = new InputStreamReader(is);
if (localAddress.getHostName().equals(localAddress.getHostAddress()) br = new BufferedReader(isr);
|| remoteAddress.getHostName().equals(remoteAddress.getHostAddress())) {
System.out.println(" note HostName matches address if host has no DNS name"); 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 // Notice the use of flush() and try w/ resources. Without
// connection. try w/ resources explicitly ends the connection. // the try w/ resources the Socket object may stay open for
ps.flush(); // a while after the client has stopped needing this
// like it or not, you're outta here! // connection. try w/ resources explicitly ends the connection.
} serverLoopCount++;
} ps.flush();
} catch (IOException e) { // like it or not, you're outta here!
System.err.println("Problem with FisherServer networking: " + e); }
}
// Provide more helpful information to user if exception occurs due to running twice at one time } catch (IOException e) {
if (e instanceof java.net.BindException) { System.err.println("Problem with FisherServer networking: " + e);
System.err.println("*** Be sure to stop any other running instances of programs using this port!");
} // 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/homework2/Fisher/Homework_2_Screenshot.png 0 → 100644
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assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/Homework_2_Screenshot.png

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assignments/src/MV3500Cohort2021JulySeptember/homework2/Leckie/LeckieClient.java 0 → 100644
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package MV3500Cohort2021JulySeptember.homework2.Leckie;
import java.io.*;
import java.net.*;
/**
*
* @author Jacob Leckie
*/
public class LeckieClient {
/** 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;
try {
while (true)
{
clientLoopCount++; // increment at beginning of loop for reliability
System.out.println(LeckieClient.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("I dont want to clean my room!");
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 (1/2 second)
} // end while(true) // infinite loops are dangerous, be sure to kill this process!
}
catch (IOException e)
{
System.err.println("Problem with " + LeckieClient.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(LeckieClient.class.getName() + " exit");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework2/Leckie/LeckieServer.java 0 → 100644
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package MV3500Cohort2021JulySeptember.homework2.Leckie;
import java.io.*;
import java.net.*;
/**
*
* @author Jacob Leckie
*/
public class LeckieServer {
/**
* 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(LeckieServer.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("I told you " + serverLoopCount + " time, go clean your room!"); // 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(LeckieServer.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 " + LeckieServer.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/homework2/McNeely/McNeelyTCPExample3Client.java 0 → 100644
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package MV3500Cohort2021JulySeptember.homework2.McNeely;
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 jrm_u
*/
public class McNeelyTCPExample3Client {
/** 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;
try {
while (true)
{
clientLoopCount++; // increment at beginning of loop for reliability
System.out.println(McNeelyTCPExample3Client.class.getName() + "McNeely 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("now we're cooking with diesel fuel!");
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 " + McNeelyTCPExample3Client.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(McNeelyTCPExample3Client.class.getName() + " exit");
}
}
}
assignments/src/MV3500Cohort2021JulySeptember/homework2/McNeely/McNeelyTCPExample3Server.java 0 → 100644
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package MV3500Cohort2021JulySeptember.homework2.McNeely;
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 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 jrm_u
*/
public class McNeelyTCPExample3Server {
/**
* 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(McNeelyTCPExample3Server.class.getName() + " has started... here we go!"); // 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 number " + serverLoopCount + " produced by Justin's 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(McNeelyTCPExample3Server.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 " + McNeelyTCPExample3Server.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!");
}
}
}
}
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examples/src/TcpExamples/TcpExample3Client.java
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...@@ -47,7 +47,7 @@ public class TcpExample3Client { ...@@ -47,7 +47,7 @@ public class TcpExample3Client {
// a connection to that IP in the form of a Socket // a connection to that IP in the form of a Socket
// object; the server uses a ServerSocket to wait for // object; the server uses a ServerSocket to wait for
// connections. // connections.
socket = new Socket(LOCALHOST, 2317); // locohost? socket = new Socket(LOCALHOST, 2317); // locohost?
// Now hook everything up (i.e. set up the streams), Java style: // Now hook everything up (i.e. set up the streams), Java style:
is = socket.getInputStream(); is = socket.getInputStream();
......
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