How to access the currentPage and currentNode Objects in a Sling Servlet

I have a requirement to write a Sling Servlet instead of regular CQ5 JSP

In a standard CQ5 JSP it's easy to use the currentPage and currentNode objects, as they are automatically added by the default includes

<%@include file="/libs/foundation/global.jsp"%>

<h2>currentPage</h2>

Title: <%= currentPage.getTitle() %><br />

Name: <%= currentPage.getName() %><br />

Path: <%= currentPage.getPath() %><br />

Depth: <%= currentPage.getDepth() %><br />

<h2>currentNode</h2>

Title: <%= currentNode.getProperty("jcr:title").getString() %><br />

Name: <%= currentNode.getName() %><br />

Path: <%= currentNode.getPath() %><br />

Depth: <%= currentNode.getDepth() %><br />   

</div>

I would like to know how to do this in a sling servlet, and be able to use the currentNode and currentPage objects.

Does anyone have any code samples they would like to share??

Thanks

Tyrone