Re: Applet Consideration

From: Yamin (absdfsd_at_sdfdasfsd.com)
Date: 03/17/04 

Date: Tue, 16 Mar 2004 18:38:08 -0500

 Hi guys,

this is prolly not JDBC specific, but I'm getting good advice here, so I
figured I'd try since its part of the same applcation.

Basically, given the setup below, one of the tricky things I'm running into
has to do with what parameters do I supply to Socket.connect(host, port) for
the client applet to connect to the server.

1. My computer(the server) is behind a router
2. I've setup the router to do port forwarding for HTTP connection(port 80)
to my local apache server (port 80)
3. I've setup the router to do port forwarding for my server app (port
10000) to my local server app(port 10000)

if I'm running the applet on the local network, I simply set the host to be
my local computers name (PC_YAMIN).
if I'm accessing remotely, I set the host to be the WAN ip address of the
gateway
Using either of these methods, everything works nicely.

What I can't seem to have happen is to have a single host variable which
works for both LAN and WAN. If I use the WAN address while trying to access
the applet locally, it says TIMED OUT WHILE TRYING TO CONNECT to WAN_IP.

Any ideas?

Thanks

Yamin

"Yamin" <absdfsd@sdfdasfsd.com> wrote in message
news:y3M5c.4484$Eb6.175056@news20.bellglobal.com...
> Okie guys,
>
> Having just went through the learning experience of sorts...this is what I
> did.
>
> I have essentially 2 application
> 1. Applet
> 2. Server
>
> Applet (Client)
> Has all the GUI code and what not. As I said, it was suprisingly easy to
> convert my standard application to an applet. I then created clientstubs
> for any database access application
> i.e. boolean login(String domain, String user, String pass)
>
> I used a really cheap protocol, as the data being sent is just Strings and
> some ints.
> Basically, everything is sent as String. One String per line so functions
> like readline() can work nicely.
>
> *************************************
> Client request consists of:
> Command String (i.e. "LOGIN" )
> param1 String
> ...
> paramn String
>
> Server replies consist of
> result string( i.e "PASS" or "FAIL" )
> return1 String
> ....
> return paramn String
> *************************************
>
> I made it so the client has absolutely no knowledge that the db exists.
> Otherwise, I'd have to grant access to the client to hold locks and what
> not, which I did not want to give for security reasons. To the client,
> everything looks like a function call (w/th some remote method type stuff)
>
> Server (runs on the same machine as the webserver/database...)
> The server listens on a port and starts server threads for each new
> connection. Each thread must be initialized by a login. This login open
a
> connection to the database. I did it this way, so in case a thread goes
> broke or someting, any locks on tables, transaction will behave nicely and
> the user can't preform any operations without login in correctly first.
> *************************************
>
> Things I might have done differently:
>
> 1. I really wanted to use SSL to encrpypt the connection. This way,
login
> passwords and other data could be transferred nicely. I read through the
> docs samples and what not, but just decided against it as I didn't want to
> add any more things that I really didn't understand.
>
> And it seems to work quite well. I tested it both locally and remotely.
It
> all seems nice ;) Sure, it might have been nice to learn PHP and what not
> (it got really tempting last night), but I already did a lot of work on
this
> in Java, so such is such.
>
> Yamin
>
>
>

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