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Khalil Ganiga
Published on

How to register a servlet on all pages in AEM

Authors

Recently I came across a usecase, where a servlet is getting invoked on all pages(including OOTB pages) of our AEM instances. I checked the source code for the implementation to see how its developed.

Solution: The servlet was registered with resourceType: cq/Page so that Servlet is registered for every Page.

With the use of a particular selector we can get results like list information/required custom information for every AEM page and display either via component with its ajax request has a url of Current Page. Selector which invokes the Servlet and renders result .

Note: – Just for reference Sling resolves on basis of Primary Type example cq:Page for Page and dam:Asset for Dam in case sling:resourceType is missing .

Code Snippet


    import java.io.IOException;
    import javax.servlet.Servlet;
    import javax.servlet.ServletException;
    import org.apache.sling.api.SlingHttpServletRequest;
    import org.apache.sling.api.SlingHttpServletResponse;
    import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
    import org.osgi.service.component.annotations.Component;

    @Component(service = Servlet.class, property = { "sling.servlet.resourceTypes=" + "cq/Page",
    		"sling.servlet.extensions=" + "json", "sling.servlet.selectors=" + "result", "service.ranking=" + "50000" })
    public class SampleServlet extends SlingSafeMethodsServlet {

    	/**
    	 *
    	 */
    	private static final long serialVersionUID = 1L;

    	@Override
    	protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response)
    			throws ServletException, IOException {
    		//Implement your logic
    	}

    }

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