A crate would be easiest. However, since you don't want to use a crate you can still train her not to jump on the door. You will need a helper to do the training though.
Helper would stay inside with the dog while you go out the door. When she/he jumps on the door the helper would correct the dog for the inappropriate behavior. Obviously this would have to be done when you weren't really going anywhere. And you would have to keep doing over and over until the dog understands not to jump on the door. And, as always, praise, praise, praise and treat when the pup gets it right.
Ziva GSD 3/7/13
At the Bridge: