Changing connector between caliper brake hose, and main brake line.

The front passenger side connector that connects the rubber hose from the caliper to the main brake line rusted. I was working on the car, and after starting to lift it when the hose just fell of the connector, and dumped out all the brake fluid. I slide it back on, filled the brake fluid up, and had my friend pump the brakes, and it shot right off. I looked closer at it, and the outer shaft of the connector that holds the rubber line up had rusted away inside the rubber boot that slides over it, and the hose once you connect them.

How do I do about changing that connector. I have a new caliper with a new hose going on, and the main brake line is perfectly fine. The connector just rusted away,