How to pass and fetch parameter in the URL using Java Portlet

Dear Sir,

Please Help me to find How to pass and fetch parameter in the URL using Java Portlet.

Problem using Ajax in Java portlet using Oracle AS portal 10.1.4

Dear Sir ,
I am new to portlet development. I want to use AJAX to populate ListBox dynamically in my page , taking values from database. Please help me to do this.

Thanks in Advance
Pradeep Chaubey