Solved

UDP Instant Messaging Server

Posted on 2004-09-12
8
271 Views
Last Modified: 2010-03-31
As part of the server i need a statement that will return the host name that is given by the client as well as the port of the client the other client asks for.

Here is the snipit of wat i hav so far..

            // Part of if statement to handle "where" command
            } else if (received.startsWith("where")) {
                String host = st.nextToken();
               

                retMes = "@"+host+":"+userport;

wat needs to go in the middle??
0
Comment
Question by:AnthonyCosenza
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
8 Comments
 
LVL 92

Accepted Solution

by:
objects earned 450 total points
ID: 12040848
if the port is the nedxt token then:
String port = st.nextToken();

0
 

Author Comment

by:AnthonyCosenza
ID: 12040870
the thing is the port isnt a token

there is no next token....

all i hav is the client name to get the port number of that client with
0
 
LVL 92

Assisted Solution

by:objects
objects earned 450 total points
ID: 12040878
then get the port number from thr DatagramSocket.
Why do you need to pass that back to the client anyway? Can't it get it from the socket.

0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:AnthonyCosenza
ID: 12040915
the way this part works:

1. a client sends a who <username> to server (username bein another client)
2. server looks through to get the host name
3. returns @host:port back to the first client (where host and port are details of the second client)

hope that clears it up
0
 
LVL 92

Assisted Solution

by:objects
objects earned 450 total points
ID: 12040930
I see, then you need to lookup the socket for the other client and get the port number.
0
 

Author Comment

by:AnthonyCosenza
ID: 12040955

how would this be done??
0
 
LVL 92

Assisted Solution

by:objects
objects earned 450 total points
ID: 12040973
your server would need to keep a mapping for the socket used by each client, allowing the server to look up the socket used by a particular username.
0
 
LVL 2

Assisted Solution

by:gen718
gen718 earned 50 total points
ID: 12041253
Do you want each client to connect with each other independent of the server once the server responds with the "who" response? Or will all packets go thru the server?

Also, embedding host info in the packets can be a concern. This usually leads to problems when running behind a firewall. Also, are all domain/host names reachable? GetByName might not resolve for private host names.

Just some thoughts. What you think objects?

0

Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

After being asked a question last year, I went into one of my moods where I did some research and code just for the fun and learning of it all.  Subsequently, from this journey, I put together this article on "Range Searching Using Visual Basic.NET …
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
Viewers learn about the “while” loop and how to utilize it correctly in Java. Additionally, viewers begin exploring how to include conditional statements within a while loop and avoid an endless loop. Define While Loop: Basic Example: Explanatio…
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question