Apache also puts out an HttpClient:

http://jakarta.apache.org/commons/httpclient/index.html

It's still in RC, but seems fairly stable.

Depending on what you're trying to do, this might be over-kill,
though.  If you need to retrieve data from the servlet, just have it
post XML (instead of HTML) and parse it like this:

DocumentBuilderFactory dfactory =
DocumentBuilderFactory.newInstance();
Document doc = dfactory.newDocumentBuilder().parse("http://foo.com/servlet/myXMLServlet");

To do simple posts, you can use the HttpURLConnection class and pass
in values by creating a query string.

-Nathan