How to create content node from Java Servlet on AEM 6.3 ?

Hi All,

How can I create a new content node (or edit an existing content node) from a Java Servlet on AEM 6.3 ?

I have attached below the Servlet source code.

Thank you for your time and best regards.

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import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.servlets.HttpConstants;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
import org.osgi.framework.Constants;
import org.osgi.service.component.annotations.Component;
import javax.jcr.Node;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.PrintWriter;
@Component(service=Servlet.class,
           property={
                   Constants.SERVICE_DESCRIPTION + "=Simple Demo Servlet",
                   "sling.servlet.methods=" + HttpConstants.METHOD_GET,
                   "sling.servlet.paths="+ "/bin/TestCreateNodeServlet"
           })
public class TestCreateNodeServlet extends SlingSafeMethodsServlet
{
    private ResourceResolver resourceResolver;
    private Resource resource;
    private PrintWriter responseWriter;
    @Override
    protected void doGet(final SlingHttpServletRequest request, final SlingHttpServletResponse response) throws ServletException, IOException
    {
        try
        {
            response.setContentType("text/plain");
            resourceResolver = request.getResourceResolver();
            resource = request.getResource();  
            responseWriter = response.getWriter();
            
            write("Version 2018-Sept-07.1");
            write(resourceResolver.toString());
            write(resource.toString());
            
            Node node = resource.adaptTo(Node.class); 
            write(node.toString());
            
            //resourceResolver.create(arg0, arg1, arg2)
        }
        catch (final Exception e)
        {
            write("ERROR: " + e.getMessage() + " , " + e.getClass());
        }
    }
    /**
     * Write message to Response Writer.
     */
    private void write(final String message)
    {
        if (responseWriter != null)
        {
            responseWriter.println("TestCreateNodeServlet: " + message);
        }
    }
}