How to "download" a multi-part file at the "server" side?

Hi all. I intend to implement a use-case, wherein the client uploads a file in multi-part format, and the server then stores the file in a mysql database (after "downloading it at the server side). I have been unable to find any immediate answers through googling; I will be grateful if someone could start me in a direction to achieve the "downloading at server via php" requirement. (Don't think it should matter, but I use Java to upload a file in multi-part format). I will be grateful for some pointers. Thanks in advance Thanks and Regards, Ajay