File Sharing in Grails

File Sharing in Grails: "Besides posting messages, our users also want to be able to upload files to share with other members of their team. Sounds good! But wait a minute, isn't file uploading a bit of a pain? First of all, we need to read the binary file data off the request, and then we need to figure out where to put the file. Do we store it on the file system, or in a database? Well, let's take a look."