To process a form post, use the createActionURL() function, which generates the form action URL. 
For example:

<form action="#createActionURL()#" method="post"> 
Value: <input type="text" name="action_value" > 
<input type="submit" value="Process Action" /> 

When the form is submitted, the portal container calls the processAction() method in your CFC. So, add this method as follows:

<cffunction name="processAction" returntype="void" access="public" output="false" hint="Called by the portlet container to allow the portlet to process an action request."> 
<cfargument name="actionRequest" type="any" required="true" hint="A 
javax.portlet.ActionRequest java object"> 
<cfargument name="actionResponse" type="any" required="true" hint="A 
javax.portlet.ActionResponse java object"> 
<cfif IsDefined("request.portlet.parameters.action_value")> 
<!--- do something with this value, such as update your database ---> 

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