Transfering 11.000 Files from One Host to a other

[fsadmin]

Hey,

I piad a other Filehosting service currently hosted files are 11.000.
So now i want to transer all files to my site. But how to keep the urls so if somebody is trying to download file on http://xy.com and will be redirected to the new url of the file so http://xyz.

Hope there is anyone who understand my bad english haha

greetz