Java Web应用程序中的生物度量设备集成

I am Integrating a bio metric finger print detection device with web based application where in on click of a simple button we will start initializing device and start capturing the fingerprint details. The code for initializing the device and capturing response is written in a Servlet because of which the web application is searching for the device on server machine but actually the device is connected to client machine(i.e. browser machine). so how to make jsp to access client machine device and capture response from it?(Preferably through javascript i guess).I am Integrating a bio metric finger print dete