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McCannServer.java 3.79 KiB
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package MV3500Cohort2019JulySeptember.homework2;
import java.io.*;
import java.net.*;
import java.util.Scanner;
/**
*
* @author ljmm1
*/
public class McCannServer {
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("McCannServer has started..."); // it helps debugging to put this on console first
//System.out.println("What is your name?");
ServerSocket serverSocket = new ServerSocket(2317);
OutputStream os;
PrintStream ps;
InetAddress localAddress, remoteAddress;
int localPort, remotePort;
// 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 clientConnection = serverSocket.accept()) {
// Now hook everything up (i.e. set up the streams), Java style:
os = clientConnection.getOutputStream();
ps = new PrintStream(os);
Scanner keyboard = new Scanner(System.in);
ps.println("What is your name?"); // this gets sent back to client!
//String message = keyboard.nextLine();
// ps.println(message);
// Print some information locally about the Socket connection.
// This includes the port and IP numbers on both sides (the socket pair).
localAddress = clientConnection.getLocalAddress();
remoteAddress = clientConnection.getInetAddress();
localPort = clientConnection.getLocalPort();
remotePort = clientConnection.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("TcpExample3Server socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( "
+ remoteAddress.toString() + ", " + remotePort + " ))");
// 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 TcpExample3Server 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!");
}
}
}
}