I'm looking for a project "read serial port wrote in java applet"

My company is a transport company. We receive goods form partner and transport it to customers. There is a process that we must accept a number of kilograms into bill after we weigh goods by the electronic balance(the electronic balance have serial port plug in PC) . To decrease this process, I'm looking for a project "read serial port wrote in java applet".

Who have code, please give me! Very urgent.

Thanks so much!