MaroonTcpServer.java

package tcpserver;

import java.io.*;
import java.net.*;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Arrays;

/**
 * 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 class MaroonTcpServer 
{
    
    public static DataInputStream input;
    public static DataOutputStream output;
    
    
    public static void main(String[] args) 
    {
        
        MaroonUnit testUnit1 = new MaroonUnit ();
        
        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);

            // Loop, infinitely, waiting for client connections.
            // Stop the program somewhere else.
            while(true)
            {
                Socket clientConnection = serverSocket.accept();
                //OutputStream os = clientConnection.getOutputStream();
                input = new DataInputStream(clientConnection.getInputStream());
                output = new DataOutputStream(clientConnection.getOutputStream());
                
                String request = input.readUTF();
                
                if ("position".equals(request)){
                    output.writeUTF(Arrays.toString(testUnit1.getPosition()));
                }
                else if ("ID".equals(request)){
                    output.writeUTF(""+ testUnit1.getID());
                    
                }else 
                    output.writeUTF("I don't understand, try www.google.com");

                
                // 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.
             
                clientConnection.close();
            }
       }
        catch(Exception e)
        {
            System.out.println("problem with networking");
        }
       
    }
    
}