How can i write a servlet to connect to a fixed url periodically?

hello
my company have domain name,but not have ip address,the public website host in a rented space in a public server.wihtin my company also have a internal website,it host in my internal network,the internal server can connect to the public server by ADSL.
now we want my internal website is published to internet by a http link in my public website page,so that the other division of my company can visit the internal website, the critical is how can i make the public server learn my address.
i plan to write a servlet in my internal web,it periodically connect to the public server,and in the public server,i write another servlet to get the tempory public ip address( by getRemoteAddr()method),but how can i implement the first servlet that is used to connect to the public server?
thanks for any helps!

because we don't have the static public ip address,we use the ADSL to connect to the internet,at every connection,you can get a temporary public ip,at same time,we wamt publish our internal website to internet,you must explose the ip address

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