param in request

[jacky]

hi,
 I added a link in  jsp
<a href="http://localhost:8080/pluto/portal/helloword?titleId=1600630";>test
link </a>

but in portlet, the param titleId can't be retrieved by
request.getParamter("titleId").  result is null.
how can i get the param in portlet?

--
 Best Regards.
     jacky