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Brutzman, Don authoredBrutzman, Don authored
HanleyTcpServer.java 3.78 KiB
//package Homework1;
import java.io.*;
import java.net.*;
/**
*
* @author Brian
*/
public class HanleyTcpServer {
/**
* Very slightly more complex than example1. A complete copy of
* example 2. 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 localhost 2317
*
* If you're sophisticated you can contact the instructor's computer
* while running this program.
*
* telnet <ipOfServersLaptop> 2317
*
* And have him display the socket pairs he got.
* @author mcgredo
*/
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.
ServerSocket serverSocket = new ServerSocket(2317);
Socket clientConnection = serverSocket.accept();
// Loop, infinitely, waiting for client connections.
// Stop the program somewhere else.
while(true)
{
//Socket clientConnection = serverSocket.accept();
OutputStream os = clientConnection.getOutputStream();
PrintStream ps = new PrintStream(os);
ps.println("This was written by the server");
// 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();
// 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("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " +
remoteAddress.toString() + ", " + remotePort + " ))");
//Exchange of Data
InputStream is = clientConnection.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String clientMessage = br.readLine();
if (clientMessage.startsWith("loc")){
System.out.println("Location Report \n"+ clientMessage);
}
else System.out.println("Incoming Message \n" + clientMessage);
ps.println("Message received");
// 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();
clientConnection.close();
}
}
catch(Exception e)
{
System.out.println("problem with networking");
}
}
}