"Where were you?" = "Where were you at a specific point in time (in the past)?" "Where have you been?" = "Where were you over a period of time (in the past)?" Also they are often interchangeable. For example: if I come home late, my parents might ask "Where were you?" to ask if I was spending time somewhere I shouldn't have been, and why I didn't come home instead. And They might ask "Where have you been?" if they were angry that I was gone so long, and also to ask what I was doing, where I was.

what do you want to say?the difference of two sentences?