How to enter values on an HTML webpage and use them to calculate using java and return them in html

Here is what I want to do: I have created a HTML webpage and I want to enter 2 values. When I press submit I want to get those values to eclipse, assign them as variable values and use them to calculate using java. After the calculations I want to print the result back to the HTML webpage. I cannot find a solution as to how I can get those values to eclipse in order to make them variable values and use them for calculations and print the results back to the webpage