两个portlet的通信

<form method="post" action="<portlet:actionURL/>">
</form>

processAction(){
String str="pp";
actionResponse.setEvent("simple-event",str);}

<supported-processiong-event>
  <name>simple-event</name>
</supported-processing-event/>
</portlet>
<event-definition>
  <name>simple-event</name>
  <value-type>lang.String</value-type>
</event-definition>

processEvent()
{
  Event event=request.getEvent();
  String str=(String)event.getValue();
}