Get the HTML markup for a resource in Apache Sling.

SlingResourceResolutionServlet.java

package com.nateyolles.sling;

import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.sling.SlingServlet;

import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
import org.apache.sling.engine.SlingRequestProcessor;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

@SlingServlet(paths={"/bin/foo"})
public class SlingResourceResolutionServlet extends SlingSafeMethodsServlet {

    /** Service to process requests through Sling */
    @Reference
    private SlingRequestProcessor requestProcessor;

    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {

        /* The resource path to resolve. Use any selectors or extension. */
        String requestPath = "/content/myapp/us/en/index/jcr:content/myparsys/mycomponent_f93d.html";

        /* 
         * Create a fake request and fake response. The response adds a method to make the HTML accessible.
         * You need the following three files from Apache Sling:
         *
         * https://github.com/apache/sling/blob/trunk/testing/junit/scriptable/src/main/java/org/apache/sling/junit/scriptable/HttpRequest.java
         * https://github.com/apache/sling/blob/trunk/testing/junit/scriptable/src/main/java/org/apache/sling/junit/scriptable/HttpResponse.java
         * https://github.com/apache/sling/blob/trunk/testing/junit/scriptable/src/main/java/org/apache/sling/junit/scriptable/TestServletOutputStream.java
         */
        final HttpRequest req = new HttpRequest(requestPath);
        final HttpResponse resp = new HttpResponse();

        /* Process request through Sling */
        requestProcessor.processRequest(req, resp, request.getResourceResolver());
        String html = resp.getContent();
    }
}