.blend With JMonkey on Eclipse

I installed Jmonkey jar on Eclipse and i look for how to display a file .blend on a Jframe.
Can you help me please?

I think you may be looking for this page: https://docs.jmonkeyengine.org/sdk/model_loader_and_viewer.html

Viewing models and such rely on the SDK, though… Generally I use the SDK to import them and double-check they are imported properly, and then go back to my regular IDE.