Tooday Jorge send me an e-mail asking how to send files using XML-RPC. So I did some modifications in Client and Server, Java XML-RPC to do this.
I implemented this and it wasn't so hard. I read the documentation of Apache XML-RPC to see how to send bytes. They are send using an array of bytes (byte) in a Base64 codification.
To create the Base64 codification I used Java Base64 in public domain.
PS: This is just an example, any file that client ask, the server will send. It WILL BE A SYSTEM VULNERABILITY!