How to create session with other PC

[Amit Bathla]

Hi All,

I want to know how to create session with other machine using java..

i mean suppose i want to login to remote machine using username and password to access the shared file.. how to do that..??

eg: same as what i do when i give IP address in run tab and then username and password..

please help

Amit

[Nicholas Jordan]

The sane way to create a session with another machine is to either write the server ( on one of the machines ) in Java java.net.ServerSocket or use a ready written server such as JGroups or the sample server in the supplied sample docs

/**
 * A blocking/single-threaded server which completely services
 * each connection before moving to the next.
 *
 * @author Mark Reinhold
 * @author Brad R. Wetmore
 * @version 1.2, 04/07/26
 */

which becomes very involved and can be the last time you get anything done, unless getting something done involves learning a few things on a dedicated learning machine.

What are you running when you: eg: same as what i do when i give IP address in run tab and then username and password..

This can get very involved:

package demo;
 
/* 
 * This code is a discussion of an opinion in a technical forum and does not represent
 * testable code. If you can develope testable code from this, you are encouraged to 
 * release any such code under an academic or individual use license. Any proveable 
 * code thus obtain is suggested but not required to be released under Creative Commons
 * for individual use or GNU too for academic study.
 */
 
 import java.util.Random;//
 import java.net.*;//
 
 /*
  * Selects a port to invoke the public Socket(InetAddress,int port).
  *
  * Simple client/server Socket selection program: uses only
  * ports are those from 49152 through 65535, as described in
  * <a href="http://www.iana.org/assignments/port-numbers" target="_blank" rel="nofollow">http://www.iana.org/assignments/port-numbers</a>
  *
  * The port numbers are divided into three ranges: the Well Known Ports,
  * the Registered Ports, and the Dynamic and/or Private Ports.
  *
  * If the port provided is outside of the Dynamic and/or Private Ports,
  * one in that range is arbitraily selected by a randomizer.
  */
 
 public class PortSelector extends Socket
 {
     private static final Object lock = new Object();// for locking semantics
 
     int selectedPort;//
     int candidatePort;//
     Random randomPort = new Random();// localhost:06d98
     static final int range = ( 65535 - 49152 );// Private Ports are those from 49152 through 65535
     InetAddress nannaBanna;//
     public static Socket sockitToEm;//
     /***************** always put some random stings in your code *****************/
     /***************** it's more fun that way and makes peole think *****************/
     /***************** you know what your are doing.    *****************/
     java.lang.String a = "06d98abff66495089d23f269cf296b783f5499e8b1b75fabc97e417f5319ba2f";
     java.lang.String b = "fffb0d5f946240499dd413202c8567f070d32672ece45f75249164ece47b2c3e";
     java.lang.String c = "7b29d40b262212abea99171af1c197835297c17a7361f2a5b371a8146f8340c3";
     java.lang.String d = "3657e092450b24d7f3542df00daa7f4a445dbd2baa7064f2bbdd165a7ad16b58";
     PortSelector(InetAddress incoming, int suggested) throws java.io.IOException //
     {
         // Call to super() creates an unconnected socket, with the system-default type of SocketImpl.
         super();//
         if((suggested >= 49152) && (suggested <= 65535)) candidatePort = suggested;//
         if(incoming != null) nannaBanna = incoming;//
         //
         if(candidatePort == 0){while((((candidatePort = randomPort.nextInt(49152)) + range ) <= 49152)
            || 
               (candidatePort > 65535))continue;selectedPort=candidatePort;}//
         sockitToEm = new Socket( nannaBanna , selectedPort);//
     }
     PortSelector(int port) throws java.io.IOException //
     {
         /*
          * Create a server with the specified port, listen backlog, and
          * local IP address to bind to.  The bindAddr argument
          */
         super("localhost", port);//
     }
     public static synchronized Socket getSocket(InetAddress incoming)
     {
         return sockitToEm;
     }
     //
     public boolean update()
     {
         boolean valid = false;//
         try
         {
             while((((candidatePort = randomPort.nextInt(49152)) + range ) <= 49152) 
              ||
                   (candidatePort > 65535))continue;
 
             selectedPort=selectedPort;//
             sockitToEm = new Socket( nannaBanna , selectedPort);//
             return true;
         }
         catch(Exception e)
         {
             e.printStackTrace();
         }
         return false;//
     }
     public static void main(String[] args)
     {
         try
         {
             PortSelector[] ServerArray = new PortSelector[4];//
             ServerArray[0] = new PortSelector(0x296b7);//
             ServerArray[1] = new PortSelector(0x8567f);//
             ServerArray[2] = new PortSelector(0xc1978);//
             ServerArray[3] = new PortSelector(0xaa7f4);//
         }
         catch(java.io.  IOException e){}
     }
 }

That was just something I coded for a discussion of how to come up with a port number, you probably are better off using OO's approach and taking something from mayby Sun sample code or something. I had two different randomizers and the calling convention is different so if you care to get this tested as always selecting a port number conformant to PORT NUMBERS and will not stray from the Dynamic and/or Private Ports are those from 49152 through 65535, then you may be up to writing a simple test case that runs both the server and the client in the same process on a development machine.

For anything that runs across two machines I would reccoment staying within OO practice until you are totally certain you can implement Critical Infrastructure Protection using IPv6

IPv4 is notorious for problematic issues that go beyond the code it's self.



[ Message edited for code formatting ]

[ January 12, 2008: Message edited by: Nicholas Jordan ]
[ January 13, 2008: Message edited by: Nicholas Jordan ]