Saturday, 8 August 2015

Registering a Servlet for every Page in AEM

UseCase: – I had a situation in which needed to return custom information corresponding to every page in AEM and also use it via component to display to end user .
-Then i have to invoke a Servlet on every page and with the use of selector want to return some information in JSON Format which can be used to display via Component on a Page to end user .
Solution : -For such situations we use the resourceType as cq/Page for registering Servlet , so that Servlet is registered for every Page.
– Then 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 :
@Component(name = "Site-Results", metatype = false
           configurationFactory = false,
           policy = ConfigurationPolicy.OPTIONAL)
    @Property(name = "sling.servlet.resourceTypes"
              value = ["cq/Page"]),
    @Property(name = "sling.servlet.selectors", value = "results"),
    @Property(name = "sling.servlet.extensions", value = ["json"]),
    @Property(name = "sling.servlet.methods", value = "GET"),
    @Property(name = "sling.servlet.description"
              value = "Gives Results for Every Page")

class ResultsServlet extends SlingSafeMethodsServlet {
    protected void doGet(SlingHttpServletRequest request, 
                         SlingHttpServletResponse response) {
     //Implement Your Logic

Hope this helps !! 

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