I kind of thinking how to pass parameters in html:link tag.
I defined a HashMap first, then pass the params map to the link tag.
<% HashMap params = new HashMap();
params.put( "factoryId", "120" );
request.setAttribute( "params", params );
%>
JSP code,
<html:link page="/actions/../someAction.do" name="params">
</html:link>.
You see I hardcode 120 to the factoryId. factoryId is drop done list, I don't know how to define the factoryId.